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Monday, August 7, 2023

Palliative care

From Wikipedia, the free encyclopedia
Palliative Medicine Physician
Occupation
Occupation type
Specialty
Activity sectors
Medicine
Description
Education required
Fields of
employment
Hospitals, Clinics

Palliative care (derived from the Latin root palliare, or 'to cloak') is an interdisciplinary medical caregiving approach aimed at optimizing quality of life and mitigating suffering among people with serious, complex, and often terminal illnesses. Within the published literature, many definitions of palliative care exist. The World Health Organization (WHO) describes palliative care as "an approach that improves the quality of life of patients and their families facing the problems associated with life-threatening illness, through the prevention and relief of suffering by means of early identification and impeccable assessment and treatment of pain and other problems, physical, psychosocial, and spiritual". In the past, palliative care was a disease specific approach, but today the WHO takes a broader patient-centered approach that suggests that the principles of palliative care should be applied as early as possible to any chronic and ultimately fatal illness. This shift was important because if a disease-oriented approach is followed, the needs and preferences of the patient are not fully met and aspects of care, such as pain, quality of life, and social support, as well as spiritual and emotional needs, fail to be addressed. Rather, a patient-centered model prioritizes relief of suffering and tailors care to increase the quality of life for terminally ill patients.

Palliative care is appropriate for individuals with serious illnesses across the age spectrum and can be provided as the main goal of care or in tandem with curative treatment. It is provided by an interdisciplinary team which can include physicians, nurses, occupational and physical therapists, psychologists, social workers, chaplains, and dietitians. Palliative care can be provided in a variety of contexts, including hospitals, outpatient, skilled-nursing, and home settings. Although an important part of end-of-life care, palliative care is not limited to individuals near the end of life.

Evidence supports the efficacy of a palliative care approach in improvement of a person's quality of life. Palliative care's main focus is to improve the quality of life for those with chronic illnesses. It is commonly the case that palliative care is provided at the end of life, but it can be helpful for a person of any stage of illness that is critical or any age.

Scope

Palliative care is able to improve healthcare quality in three sectors: physical and emotional relief, strengthening of patient-physician communication and decision-making, and coordinated continuity of care across various healthcare settings, including hospital, home, and hospice. The overall goal of palliative care is to improve quality of life of individuals with serious illness, any life-threatening condition which either reduces an individual's daily function or quality of life or increases caregiver burden, through pain and symptom management, identification and support of caregiver needs, and care coordination. Palliative care can be delivered at any stage of illness alongside other treatments with curative or life-prolonging intent and is not restricted to people receiving end-of-life care. Historically, palliative care services were focused on individuals with incurable cancer, but this framework is now applied to other diseases, including severe heart failure, chronic obstructive pulmonary disease, multiple sclerosis and other neurodegenerative conditions. Forty million people each year are expected to need palliative care, with approximately 78% of this population living in low and middle income countries. However, only 14% of this population is able to receive this kind of care, with a majority in high-income countries, making this an important sector to pay attention to.

Palliative care can be initiated in a variety of care settings, including emergency rooms, hospitals, hospice facilities, or at home. For some severe disease processes, medical specialty professional organizations recommend initiating palliative care at the time of diagnosis or when disease-directed options would not improve a patient's prognosis. For example, the American Society of Clinical Oncology recommends that patients with advanced cancer should be "referred to interdisciplinary palliative care teams that provide inpatient and outpatient care early in the course of disease, alongside active treatment of their cancer" within eight weeks of diagnosis.

Appropriately engaging palliative care providers as a part of patient care improves overall symptom control, quality of life, and family satisfaction of care while reducing overall healthcare costs.

Palliative care vis-à-vis hospice care

The distinction between palliative care and hospice differs depending on global context.

In the United States, the term hospice refers specifically to a benefit provided by the federal government since 1982. Hospice care services and palliative care programs share similar goals of mitigating unpleasant symptoms, controlling pain, optimizing comfort, and addressing psychological distress. Hospice care focuses on comfort and psychological support and curative therapies are not pursued. Under the Medicare Hospice Benefit, individuals certified by two physicians to have less than six months to live (assuming a typical course) have access to specialized hospice services through various insurance programs (Medicare, Medicaid, and most health maintenance organizations and private insurers). An individual's hospice benefits are not revoked if that individual lives beyond a six-month period. In the United States, in order to be eligible for hospice, patients usually forego treatments aimed at cure, unless they are minors. This is to avoid what is called concurrent care, where two different clinicians are billing for the same service. In 2016 a movement began to extend the reach of concurrent care to adults who were eligible for hospice but not yet emotionally prepared to forego curative treatments.

Outside the United States, the term hospice usually refers to a building or institution that specializes in palliative care. These institutions provide care to patients with end of life and palliative care needs. In the common vernacular outside the United States, hospice care and palliative care are synonymous and are not contingent on different avenues of funding.

Over 40% of all dying patients in the United States currently undergo hospice care. Most of the hospice care occurs at a home environment during the last weeks/months of their lives. Of those patients, 86.6% believe their care is "excellent". Hospice's philosophy is that death is a part of life, so it is personal and unique. Caregivers are encouraged to discuss death with the patients and encourage spiritual exploration (if they so wish).

History

The field of palliative care grew out of the hospice movement, which is commonly associated with Dame Cicely Saunders, who founded St. Christopher's Hospice for the terminally ill in 1967, and Elisabeth Kübler-Ross who published her seminal work "On Death and Dying" in 1969.In 1974, Balfour Mount coined the term "palliative care". and Paul Henteleff became the director of a new "terminal care" unit at Saint Boniface Hospital in Winnipeg. In 1987, Declan Walsh established a palliative medicine service at the Cleveland Clinic Cancer Center in Ohio which later expanded to become the training site of the first palliative care clinical and research fellowship as well as the first acute pain and palliative care inpatient unit in the United States. The program evolved into The Harry R. Horvitz Center for Palliative Medicine which was designated as an international demonstration project by the World Health Organization and accredited by the European Society for Medical Oncology as an Integrated Center of Oncology and Palliative Care.

Advances in palliative care have since inspired a dramatic increase in hospital-based palliative care programs. Notable research outcomes forwarding the implementation of palliative care programs include:

  • Evidence that hospital palliative care consult teams are associated with significant hospital and overall health system cost savings.
  • Evidence that palliative care services increase the likelihood of dying at home and reduce symptom burden without impacting on caregiver grief among the vast majority of Americans who prefer to die at home.
  • Evidence that providing palliative care in tandem with standard oncologic care among patients with advanced cancer is associated with lower rates of depression, increased quality of life, and increased length of survival compared to those receiving standard oncologic care and may even prolong survival.

Over 90% of US hospitals with more than 300 beds have palliative care teams, yet only 17% of rural hospitals with 50 or more beds have palliative care teams. Hospice and palliative medicine has been a board certified sub-specialty of medicine in the United States since 2006. Additionally, in 2011, The Joint Commission began an Advanced Certification Program for Palliative Care that recognizes hospital inpatient programs demonstrating outstanding care and enhancement of the quality of life for people with serious illness.

Practice

Symptom assessment

One instrument used in palliative care is the Edmonton Symptom Assessment Scale (ESAS), which consists of eight visual analog scales (VAS) ranging from 0–10, indicating the levels of pain, activity, nausea, depression, anxiety, drowsiness, appetite, sensation of well-being, and sometimes shortness of breath. A score of 0 indicates absence of the symptom, and a score of 10 indicates the worst possible severity. The instrument can be completed by the patient, with or without assistance, or by nurses and relatives.

Interventions

Medications used in palliative care can be common medications but used for a different indication based on established practices with varying degrees of evidence. Examples include the use of antipsychotic medications, anticonvulsants, and morphine. Routes of administration may differ from acute or chronic care, as many people in palliative care lose the ability to swallow. A common alternative route of administration is subcutaneous, as it is less traumatic and less difficult to maintain than intravenous medications. Other routes of administration include sublingual, intramuscular and transdermal. Medications are often managed at home by family or nursing support.

Palliative care interventions in care homes may contribute to lower discomfort for residents with dementia and to improve family members' views of the quality of care. However, higher quality research is needed to support the benefits of these interventions for older people dying in these facilities.

High-certainty evidence supports the finding that implementation of home-based end-of-life care programs may increase the number of adults who will die at home and slightly improve patient satisfaction at a one-month follow-up. The impact of home-based end-of-life care on caregivers, healthcare staff, and health service costs are uncertain.

Pain, distress, and anxiety

For many patients, end of life care can cause emotional and psychological distress, contributing to their total suffering. An interdisciplinary palliative care team consisting of a mental health professional, social worker, counselor, as well as spiritual support such as a chaplain, can play important roles in helping people and their families cope using various methods such as counseling, visualization, cognitive methods, drug therapy and relaxation therapy to address their needs. Palliative pets can play a role in this last category.

Total pain

In the 1960s, hospice pioneer Cicely Saunders first introduced the term "total pain" to describe the heterogenous nature of pain. This is the idea that a patient's experience of total pain has distinctive roots in the physical, psychological, social and spiritual realm but that they are all still closely linked to one another. Identifying the cause of pain can help guide care for some patients, and impact their quality of life overall.

Physical pain

Physical pain can be managed using pain medications as long as they do not put the patient at further risk for developing or increasing medical diagnoses such as heart problems or difficulty breathing. Patients at the end of life can exhibit many physical symptoms that can cause extreme pain such as dyspnea (or difficulty breathing), coughing, xerostomia (dry mouth), nausea and vomiting, constipation, fever, delirium, and excessive oral and pharyngeal secretions ("Death Rattle"). Radiation is commonly used with palliative intent to alleviate pain in patients with cancer. As an effect from radiation may take days to weeks to occur, patients dying a short time following their treatment are unlikely to receive benefit.

Psychosocial pain and anxiety

Once the immediate physical pain has been dealt with, it is important to remember to be a compassionate and empathetic caregiver that is there to listen and be there for their patients. Being able to identify the distressing factors in their life other than the pain can help them be more comfortable. When a patient has their needs met then they are more likely to be open to the idea of hospice or treatments outside comfort care. Having a psychosocial assessment allows the medical team to help facilitate a healthy patient-family understanding of adjustment, coping and support. This communication between the medical team and the patients and family can also help facilitate discussions on the process of maintaining and enhancing relationships, finding meaning in the dying process, and achieving a sense of control while confronting and preparing for death. For adults with anxiety, medical evidence in the form of high-quality randomized trials is insufficient to determine the most effective treatment approach to reduce the symptoms of anxiety.

Spirituality

Spirituality is a fundamental component of palliative care. According to the Clinical Practice Guidelines for Quality Palliative Care, spirituality is a "dynamic and intrinsic aspect of humanity" and has been associated with "an improved quality of life for those with chronic and serious illness", especially for patients who are living with incurable and advanced illnesses of a chronic nature. Spiritual beliefs and practices can influence perceptions of pain and distress, as well as quality of life among advanced cancer patients. Spiritual needs are often described in literature as including loving/being loved, forgiveness, and deciphering the meaning of life.

Most spiritual interventions are subjective and complex. Many have not been well evaluated for their effectiveness, however tools can be used to measure and implement effective spiritual care.

Nausea and vomiting

Nausea and vomiting are common in people who have advanced terminal illness and can cause distress. Several antiemetic pharmacologic options are suggested to help alleviate these symptoms. For people who do not respond to first-line medications, levomepromazine may be used, however there have been insufficient clinical trials to assess the effectiveness of this medication. Haloperidol and droperidol are other medications that are sometimes prescribed to help alleviate nausea and vomiting, however further research is also required to understand how effective these medications may be.

Hydration and nutrition

Many terminally ill people cannot consume adequate food or drink. Providing medically assisted food or drink to prolong their life and improve the quality of their life is common, however there have been few high quality studies to determine best practices and the effectiveness of these approaches.

Pediatric palliative care

Pediatric palliative care is family-centered, specialized medical care for children with serious illnesses that focuses on mitigating the physical, emotional, psychosocial, and spiritual suffering associated with illness to ultimately optimize quality of life.

Pediatric palliative care practitioners receive specialized training in family-centered, developmental and age-appropriate skills in communication and facilitation of shared decision making; assessment and management of pain and distressing symptoms; advanced knowledge in care coordination of multidisciplinary pediatric caregiving medical teams; referral to hospital and ambulatory resources available to patients and families; and psychologically supporting children and families through illness and bereavement.

Symptoms assessment and management of children

As with palliative care for adults, symptom assessment and management is a critical component of pediatric palliative care as it improves quality of life, gives children and families a sense of control, and prolongs life in some cases. The general approach to assessment and management of distressing symptoms in children by a palliative care team is as follows:

  • Identify and assess symptoms through history taking (focusing on location, quality, time course, as well as exacerbating and mitigating stimuli). Symptoms assessment in children is uniquely challenging due to communication barriers depending on the child's ability to identify and communicate about symptoms. Thus, both the child and caregivers should provide the clinical history. With this said, children as young as four years of age can indicate the location and severity of pain through visual mapping techniques and metaphors.
  • Perform a thorough exam of the child. Special attention to the child's behavioral response to exam components, particularly in regards to potentially painful stimuli. A commonly held myth is that premature and neonatal infants do not experience pain due to their immature pain pathways, but research demonstrates pain perception in these age groups is equal or greater than that of adults. With this said, some children experiencing intolerable pain present with 'psychomotor inertia', a phenomenon where a child in severe chronic pain presents overly well behaved or depressed. These patients demonstrate behavioral responses consistent with pain relief when titrated with morphine. Finally, because children behaviorally respond to pain atypically, a playing or sleeping child should not be assumed to be without pain.
  • Identify the place of treatment (tertiary versus local hospital, intensive care unit, home, hospice, etc.).
  • Anticipate symptoms based on the typical disease course of the hypothesized diagnosis.
  • Present treatment options to the family proactively, based on care options and resources available in each of the aforementioned care settings. Ensuing management should anticipate transitions of palliative care settings to afford seamless continuity of service provision across health, education, and social care settings.
  • Consider both pharmacologic and non-pharmacologic treatment modalities (education and mental health support, administration of hot and cold packs, massage, play therapy, distraction therapy, hypnotherapy, physical therapy, occupational therapy, and complementary therapies) when addressing distressing symptoms. Respite care is an additional practice that can further aid alleviating the physical and mental pain from the child and its family. By allowing the caregiving to ensue by other qualified individuals, it allows the family time to rest and renew themselves
  • Assess how the child perceives their symptoms (based on personal views) to create individualized care plans.
  • After the implementation of therapeutic interventions, involve both the child and family in the reassessment of symptoms.

The most common symptoms in children with severe chronic disease appropriate for palliative care consultation are weakness, fatigue, pain, poor appetite, weight loss, agitation, lack of mobility, shortness of breath, nausea and vomiting, constipation, sadness or depression, drowsiness, difficulty with speech, headache, excess secretions, anemia, pressure area problems, anxiety, fever, and mouth sores. The most common end of life symptoms in children include shortness of breath, cough, fatigue, pain, nausea and vomiting, agitation and anxiety, poor concentration, skin lesions, swelling of the extremities, seizures, poor appetite, difficulty with feeding, and diarrhea. In older children with neurologic and neuromuscular manifestations of disease, there is a high burden of anxiety and depression that correlates with disease progression, increasing disability, and greater dependence on carers. From the caregiver's perspective, families find changes in behavior, reported pain, lack of appetite, changes in appearance, talking to God or angels, breathing changes, weakness, and fatigue to be the most distressing symptoms to witness in their loved ones.

As discussed above, within the field of adult palliative medicine, validated symptoms assessment tools are frequently utilized by providers, but these tools lack essential aspects of children's symptom experience. Within pediatrics, there is not a comprehensive symptoms assessment widely employed. A few symptoms assessment tools trialed among older children receiving palliative care include the Symptom Distress Scale, and the Memorial Symptom Assessment Scale, and Childhood Cancer Stressors Inventor. Quality of life considerations within pediatrics are unique and an important component of symptoms assessment. The Pediatric Cancer Quality of Life Inventory-32 (PCQL-32) is a standardized parent-proxy report which assesses cancer treatment-related symptoms (focusing mainly on pain and nausea). But again, this tool does not comprehensively assess all palliative are symptoms issues. Symptom assessment tools for younger age groups are rarely utilized as they have limited value, especially for infants and young children who are not at a developmental stage where they can articulate symptoms.

Communication with children and families

Within the realm of pediatric medical care, the palliative care team is tasked with facilitating family-centered communication with children and their families, as well as multidisciplinary pediatric caregiving medical teams to forward coordinated medical management and the child's quality of life. Strategies for communication are complex as the pediatric palliative care practitioners must facilitate a shared understanding of and consensus for goals of care and therapies available to the sick child amongst multiple medical teams who often have different areas of expertise. Additionally, pediatric palliative care practitioners must assess both the sick child and their family's understanding of complex illness and options for care, and provide accessible, thoughtful education to address knowledge gaps and allow for informed decision making. Finally, practitioners are supporting children and families in the queries, emotional distress, and decision making that ensues from the child's illness.

Many frameworks for communication have been established within the medical literature, but the field of pediatric palliative care is still in relative infancy. Communication considerations and strategies employed in a palliative setting include:

  • Developing supportive relationships with patients and families. An essential component of a provider's ability to provide individualized palliative care is their ability to obtain an intimate understanding of the child and family's preferences and overall character. On initial consultation, palliative care providers often focus on affirming a caring relationship with the pediatric patient and their family by first asking the child how they would describe themself and what is important to them, communicating in an age and developmentally cognizant fashion. The provider may then gather similar information from the child's caregivers. Questions practitioners may ask include 'What does the child enjoy doing? What do they most dislike doing? What does a typical day look like for the child?' Other topics potentially addressed by the palliative care provider may also include familial rituals as well as spiritual and religious beliefs, life goals for the child, and the meaning of illness within the broader context of the child and their family's life.
  • Developing a shared understanding of the child's condition with the patient and their family. The establishment of shared knowledge between medical providers, patients, and families is essential when determining palliative goals of care for pediatric patients. Initially, practitioners often elicit information from the patient and child to ascertain these parties' baseline understanding of the child's situation. Assessing for baseline knowledge allows the palliative care provider to identify knowledge gaps and provide education on those topics. Through this process, families can pursue informed, shared medical decision making regarding their child's care. A framework often employed by pediatric palliative care providers is 'ask, tell, ask' where the provider asks the patient and their family for a question to identify their level of comprehension of the situation, and then subsequently supplements the family's knowledge with additional expert knowledge. This information is often conveyed without jargon or euphemism to maintain trust and ensure understanding. Providers iteratively check for comprehension of this knowledge supplementation by asking questions related to previous explanations, as information retention can be challenging when undergoing a stressful experience.
  • Establishing meaning and dignity regarding the child's illness. As part of developing a shared understanding of a child's illness and character, palliative providers will assess both the child and their family's symbolic and emotional relationship to disease. As both the somatic and psychologic implications of illness can be distressing to children, palliative care practitioners look for opportunities to establish meaning and dignity regarding the child's illness by contextualizing disease within a broader framework of the child's life. Derived from the fields of dignity therapy and meaning-centered psychotherapy, the palliative care provider may explore the following questions with the sick child and their family:
    • What gives your life meaning, worth, or purpose?
    • Where do you find strength and support?
    • What inspires you?
    • How do you like to be thought of?
    • What are you most proud of?
    • What are the particular things you would like your family to know or remember about you?
    • When was the last time you laughed really hard?
    • Are you frightened by all of this? What, in particular, are you most frightened of?
    • What is the meaning of this (illness) experience for you? Do you ever think about why this happened to you?
  • Assessing preferences for decision making. Medical decision making in a pediatric setting is unique in that it is often the child's legal guardians, not the patient, who ultimately consent for most medical treatments. Yet within a palliative care setting, it is particularly consequential to incorporate the child's preferences within the ultimate goals of care. Equally important to consider, families may vary in the level of responsibility they want in this decision-making process. Their preference may range from wanting to be the child's sole decision makers, to partnering with the medical team in a shared decision making model, to advocating for full deferral of decision-making responsibility to the clinician. Palliative care providers clarify a family's preferences and support needs for medical decision making by providing context, information, and options for treatment and medical palliation. In the case of critically ill babies, parents are able to participate more in decision making if they are presented with options to be discussed rather than recommendations by the doctor. Utilizing this style of communication also leads to less conflict with doctors and might help the parents cope better with the eventual outcomes.
  • Optimizing the environment for effective conversations around prognosis and goals of care. Essential to facilitating supportive, clear communication around potentially distressing topics such as prognosis and goals of care for seriously ill pediatric patients is optimizing the setting where this communication will take place and developing informed consensus among the child's caregiving team regarding goals and options for care. Often, these conversations occur within the context of family meetings, which are formal meetings between families and the child's multidisciplinary medical team. Prior to the family meeting, providers often meet to discuss the child's overall case, reasonably expected prognosis, and options for care, in addition to clarifying specific roles each provider will take on during the family meeting. During this meeting, the multidisciplinary medical team may also discuss any legal or ethical considerations related to the case. Palliative care providers often facilitate this meeting and help synthesize its outcome for children and their families. Experts in optimized communication, palliative care providers may opt to hold the family meeting in a quiet space where the providers and family can sit and address concerns during a time when all parties are not constrained. Additionally, parents' preferences regarding information exchange with the sick child present should be clarified. If the child's guardians are resistant to disclosing information in front of their child, the child's provider may explore parental concerns on the topic. When excluded from family meetings and moments of challenging information exchange, adolescents, in particular, may have challenges with trusting their medical providers if they feel critical information is being withheld. It is important to follow the child's lead when deciding whether to disclose difficult information. Additionally, including them in these conversations can help the child fully participate in their care and medical decision making. Finally, it is important to prioritize the family's agenda while additionally considering any urgent medical decisions needed to advance the child's care.
  • Supporting emotional distress. A significant role of the pediatric palliative care provider is to help support children, their families, and their caregiving teams through the emotional stress of illness. Communication strategies the palliative care provider may employ in this role are asking for permission when engaging with potentially distressing conversations, naming emotions witnessed to create opportunities to discuss complex emotional responses to illness, actively listening, and allowing for invitational silence. The palliative care provider may iteratively assess the child and family's emotional responses and needs during challenging conversations. At times, the medical team may be hesitant to discuss a child's prognosis out of fear of increasing distress. This sentiment is not supported by the literature; among adults, end of life discussions are not associated with increased rates of anxiety or depression. Though this topic is not well studied in pediatric populations, conversations about prognosis have the potential to increase in parental hope and peace of mind.
  • SPIKE framework. This is a framework that is designed to assist healthcare workers deliver bad news. The acronym stands for: setting, perception, invitation, knowledge, empathy, and summarize/strategy. When giving bad news it is important to consider the setting, which considers the environment in which the healthcare provider is delivering the news including privacy, sitting, time, and the inclusion of family members. What to say should also be considered, as well as rehearsed. It is important to understand how a patient is receiving the information by asking open ended questions and asking them to repeat what they learned in their own words, which is perception aspect of the framework. The healthcare provider should seek an invitation from the patient to disclose additional information before doing so in order to prevent overwhelming or distressing the patient further. In order to ensure the patient understands what is being told, knowledge must be used. This includes speaking in a way that the patient will understand, using simple words, not being excessively blunt, giving information in small chunks and checking in with the patient to confirm that they understand, and not providing poor information that may not be completely true. In order to alleviate some of a patient's distress it is crucial to be empathetic in the sense of understanding how a patient is feeling and the reactions they are having. This can allow one to change how they are delivering information, allow the patient to have time to process the information, or console them if needed. Connecting with patients is an important step in delivering bad news; maintaining eye contact proves that the healthcare provider is present and the patient and family has their full attention. Furthermore, the provider may make a connection by touching the patients shoulder or hand, giving them a physical connection to know that they are not alone. Finally, it is important to summarize all the information given in order to ensure the patient fully understands and takes away the major points. Additionally, patients who have a clear plan for the future are less likely to feel anxious and uncertain, but it is important to ask people if they are ready for that information before providing them with it.

Geriatric palliative care

With the transition in the population toward lower child mortality and lower death rates, countries around the world are seeing larger elderly populations. In some countries, this means a growing burden on national resources in the shape of social security and health care payments. As aging populations put increasing pressure on existing resources, long-term palliative care for patients’ non-communicable, chronic conditions has emerged as a necessary approach to increase these patient’s quality of life, through prevention and relief by identifying, assessing, and treating the source of pain and other psychosocial and spiritual problems.

Society

Costs and funding

Funding for hospice and palliative care services varies. In Great Britain and many other countries all palliative care is offered free, either through the National Health Service or through charities working in partnership with the local health services. Palliative care services in the United States are paid by philanthropy, fee-for-service mechanisms, or from direct hospital support while hospice care is provided as a Medicare benefit; similar hospice benefits are offered by Medicaid and most private health insurers. Under the Medicare Hospice Benefit (MHB), a person signs off their Medicare Part B (acute hospital payment) and enrolls in the MHB through Medicare Part B with direct care provided by a Medicare certified hospice agency. Under terms of the MHB, the hospice agency is responsible for the care plan and may not bill the person for services. The hospice agency, together with the person's primary physician, is responsible for determining the care plan. All costs related to the terminal illness are paid from a per diem rate (~US $126/day) that the hospice agency receives from Medicare – this includes all drugs and equipment, nursing, social service, chaplain visits, and other services deemed appropriate by the hospice agency; Medicare does not pay for custodial care. People may elect to withdraw from the MHB and return to Medicare Part A and later re-enroll in hospice.

Certification and training for services

In most countries, hospice care and palliative care is provided by an interdisciplinary team consisting of physicians, pharmacists, nurses, nursing assistants, social workers, chaplains, and caregivers. In some countries, additional members of the team may include certified nursing assistants and home healthcare aides, as well as volunteers from the community (largely untrained but some being skilled medical personnel), and housekeepers. In the United States, the physician sub-specialty of hospice and palliative medicine was established in 2006 to provide expertise in the care of people with life-limiting, advanced disease, and catastrophic injury; the relief of distressing symptoms; the coordination of interdisciplinary care in diverse settings; the use of specialized care systems including hospice; the management of the imminently dying patient; and legal and ethical decision making in end of life care.

Caregivers, both family and volunteers, are crucial to the palliative care system. Caregivers and people being treated often form lasting friendships over the course of care. As a consequence caregivers may find themselves under severe emotional and physical strain. Opportunities for caregiver respite are some of the services hospices provide to promote caregiver well-being. Respite may last a few hours up to several days (the latter being done by placing the primary person being cared for in a nursing home or inpatient hospice unit for several days).

In the US, board certification for physicians in palliative care was through the American Board of Hospice and Palliative Medicine; recently this was changed to be done through any of 11 different speciality boards through an American Board of Medical Specialties-approved procedure. Additionally, board certification is available to osteopathic physicians (D.O.) in the United States through four medical specialty boards through an American Osteopathic Association Bureau of Osteopathic Specialists-approved procedure. More than 50 fellowship programs provide one to two years of specialty training following a primary residency. In the United Kingdom palliative care has been a full specialty of medicine since 1989 and training is governed by the same regulations through the Royal College of Physicians as with any other medical speciality. Nurses, in the United States and internationally, can receive continuing education credits through Palliative Care specific trainings, such as those offered by End-of-Life Nursing Education Consortium (ELNEC).

The Tata Memorial Centre in Mumbai has offered a physician's course in palliative medicine since 2012, the first one of its kind in the country.

Regional variation in services

In the United States, hospice and palliative care represent two different aspects of care with similar philosophies, but with different payment systems and location of services. Palliative care services are most often provided in acute care hospitals organized around an interdisciplinary consultation service, with or without an acute inpatient palliative care unit. Palliative care may also be provided in the dying person's home as a "bridge" program between traditional US home care services and hospice care or provided in long-term care facilities. In contrast over 80% of hospice care in the US is provided at home with the remainder provided to people in long-term care facilities or in free standing hospice residential facilities. In the UK hospice is seen as one part of the speciality of palliative care and no differentiation is made between 'hospice' and 'palliative care'.

In the UK palliative care services offer inpatient care, home care, day care and outpatient services, and work in close partnership with mainstream services. Hospices often house a full range of services and professionals for children and adults. In 2015 the UK's palliative care was ranked as the best in the world "due to comprehensive national policies, the extensive integration of palliative care into the National Health Service, a strong hospice movement, and deep community engagement on the issue".

In 2021 the UK's National Palliative and End of Life Care Partnership published their six ambitions for 2021–26. These include fair access to end of life care for everyone regardless of who they are, where they live or their circumstances, and the need to maximise comfort and wellbeing. Informed and timely conversations are also highlighted.

Acceptance and access

The focus on a person's quality of life has increased greatly since the 1990s. In the United States today, 55% of hospitals with more than 100 beds offer a palliative-care program, and nearly one-fifth of community hospitals have palliative-care programs. A relatively recent development is the palliative-care team, a dedicated health care team that is entirely geared toward palliative treatment.

Physicians practicing palliative care do not always receive support from the people they are treating, family members, healthcare professionals or their social peers. More than half of physicians in one survey reported that they have had at least one experience where a patient's family members, another physician or another health care professional had characterized their work as being "euthanasia, murder or killing" during the last five years. A quarter of them had received similar comments from their own friends or family member, or from a patient.

Despite significant progress that has been made to increase the access to palliative care within the United States and other countries as well, many countries have not yet considered palliative care as a public health problem, and therefore do not include it in their public health agenda. Resources and cultural attitudes both play significant roles in the acceptance and implementation of palliative care in the health care agenda. A study identified the current gaps in palliative care for people with severe mental illness (SMI's). They found that due to the lack of resources within both mental health and end of life services people with SMI's faced a number of barriers to accessing timely and appropriate palliative care. They called for a multidisciplinary team approach, including advocacy, with a point of contact co-ordinating the appropriate support for the individual. They also state that end of life and mental health care needs to be included in the training for professionals.

A review states that by restricting referrals to palliative care only when patients have a definitive time line for death, something that the study found to often be inaccurate, can have negative implications for the patient both when accessing end of life care, or being unable to access services due to not receiving a time line from medical professionals. The authors call for a less rigid approach to referrals to palliative care services in order to better support the individual, improve quality of life remaining and provide more holistic care.

Many people with chronic pain are stigmatized and treated as opioid addicts. Patients can build a tolerance to drugs and have to take more and more to manage their pain. The symptoms of chronic pain patients do not show up on scans, so the doctor must go off trust alone. This is the reason that some wait to consult their doctor and endure sometimes years of pain before seeking help.

Popular media

Palliative care was the subject of the 2018 Netflix short documentary, End Game by directors Rob Epstein and Jeffrey Friedman about terminally ill patients in a San Francisco hospital and features the work of palliative care physician, BJ Miller. The film's executive producers were Steven Ungerleider, David C. Ulich and Shoshana R. Ungerleider.

In 2016, an open letter to the singer David Bowie written by a palliative care doctor, Professor Mark Taubert, talked about the importance of good palliative care, being able to express wishes about the last months of life, and good tuition and education about end of life care generally. The letter went viral after David Bowie's son Duncan Jones shared it. The letter was subsequently read out by the actor Benedict Cumberbatch and the singer Jarvis Cocker at public events.

Research

Research funded by the UK's National Institute for Health and Care Research (NIHR) has addressed these areas of need. Examples highlight inequalities faced by several groups and offers recommendations. These include the need for close partnership between services caring for people with severe mental illness, improved understanding of barriers faced by Gypsy, Traveller and Roma communities, the provision of flexible palliative care services for children from ethnic minorities or deprived areas.

Other research suggests that giving nurses and pharmacists easier access to electronic patient records about prescribing could help people manage their symptoms at home. A named professional to support and guide patients and carers through the healthcare system could also improve the experience of care at home at the end of life. A synthesised review looking at palliative care in the UK created a resource showing which services were available and grouped them according to their intended purpose and benefit to the patient. They also stated that currently in the UK palliative services are only available to patients with a timeline to death, usually 12 months or less. They found these timelines to often be inaccurate and created barriers to patients accessing appropriate services. They call for a more holistic approach to end of life care which is not restricted by arbitrary timelines.

Seizure

From Wikipedia, the free encyclopedia
https://en.wikipedia.org/wiki/Seizure

Epileptic seizure
Other namesEpileptic fit, seizure, fit, convulsions
Generalized 3 Hz spike and wave discharges in an electroencephalogram (EEG) of an epileptic patient
SpecialtyNeurology, emergency medicine
SymptomsVariable
ComplicationsFalling, Drowning, Car accidents, Pregnancy complications, Emotional health issues
DurationTypically < 2 minutes
TypesFocal, generalized; Provoked, unprovoked
CausesProvoked: Low blood sugar, alcohol withdrawal, low blood sodium, fever, brain infection, traumatic brain injury
Unprovoked: Unknown, brain injury, brain tumor, previous stroke
Diagnostic methodBased on symptoms, blood tests, medical imaging, electroencephalography
Differential diagnosisSyncope, psychogenic non-epileptic seizure, migraine aura, transient ischemic attack
TreatmentLess than 5 min: Place person on their side, remove nearby dangerous objects
More than 5 min: Treat as per status epilepticus
Frequency~10% of people (overall worldwide lifetime risk)

An epileptic seizure, informally known as a seizure, is a period of symptoms due to abnormally excessive or synchronous neuronal activity in the brain. Outward effects vary from uncontrolled shaking movements involving much of the body with loss of consciousness (tonic-clonic seizure), to shaking movements involving only part of the body with variable levels of consciousness (focal seizure), to a subtle momentary loss of awareness (absence seizure). Most of the time these episodes last less than two minutes and it takes some time to return to normal. Loss of bladder control may occur.

Seizures may be provoked and unprovoked. Provoked seizures are due to a temporary event such as low blood sugar, alcohol withdrawal, abusing alcohol together with prescription medication, low blood sodium, fever, brain infection, or concussion. Unprovoked seizures occur without a known or fixable cause such that ongoing seizures are likely. Unprovoked seizures may be exacerbated by stress or sleep deprivation. Epilepsy describes brain disease in which there has been at least one unprovoked seizure and where there is a high risk of additional seizures in the future. Conditions that look like epileptic seizures but are not include: fainting, nonepileptic psychogenic seizure and tremor.

A seizure that lasts for more than a brief period is a medical emergency. Any seizure lasting longer than five minutes should be treated as status epilepticus. A first seizure generally does not require long-term treatment with anti-seizure medications unless a specific problem is found on electroencephalogram (EEG) or brain imaging. Typically it is safe to complete the work-up following a single seizure as an outpatient. In many, with what appears to be a first seizure, other minor seizures have previously occurred.

Up to 10% of people have had at least one epileptic seizure in their lifetime. Provoked seizures occur in about 3.5 per 10,000 people a year while unprovoked seizures occur in about 4.2 per 10,000 people a year. After one seizure, the chance of experiencing a second one is about 50%. Epilepsy affects about 1% of the population at any given time.

Signs and symptoms

The signs and symptoms of seizures vary depending on the type. The most common and stereotypical type of seizure is convulsive (60%), typically called a tonic-clonic seizure. Two-thirds of these begin as focal seizures prior to developing into tonic-clonic seizures. The remaining 40% of seizures are non-convulsive, an example of which is absence seizure. When EEG monitoring shows evidence of a seizure, but no symptoms are present, it is referred to as a subclinical seizure.

Focal seizures

Focal seizures often begin with certain experiences, known as an aura. These may include sensory (including visual, auditory, etc.), cognitive, autonomic, olfactory or motor phenomena.

In a complex partial seizure, a person may appear confused or dazed and cannot respond to questions or direction.

Jerking activity may start in a specific muscle group and spread to surrounding muscle groups—known as a Jacksonian march. Unusual activities that are not consciously created may occur. These are known as automatisms and include simple activities like smacking of the lips or more complex activities such as attempts to pick something up.

Generalized seizures

There are six main types of generalized seizures: tonic-clonic, tonic, clonic, myoclonic, absence, and atonic seizures. They all involve a loss of consciousness and typically happen without warning.

  • Tonic-clonic seizures present with a contraction of the limbs followed by their extension, along with arching of the back for 10–30 seconds. A cry may be heard due to contraction of the chest muscles. The limbs then begin to shake in unison. After the shaking has stopped it may take 10–30 minutes for the person to return to normal.
  • Tonic seizures produce constant contractions of the muscles. The person may turn blue if breathing is impaired.
  • Clonic seizures involve shaking of the limbs in unison.
  • Myoclonic seizures involve spasms of muscles in either a few areas or generalized through the body.
  • Absence seizures can be subtle, with only a slight turn of the head or eye blinking. The person often does not fall over and may return to normal right after the seizure ends, though there may also be a period of post-ictal disorientation.
  • Atonic seizures involve the loss of muscle activity for greater than one second. This typically occurs bilaterally (on both sides of the body).

Duration

A seizure can last from a few seconds to more than five minutes, at which point it is known as status epilepticus. Most tonic-clonic seizures last less than two or three minutes. Absence seizures are usually around 10 seconds in duration.

Postictal

After the active portion of a seizure, there is typically a period of confusion called the postictal period, before a normal level of consciousness returns. This period usually lasts 3 to 15 minutes, but may last for hours. Other symptoms during this period include: tiredness, headache, difficulty speaking, and abnormal behavior. Psychosis after a seizure occurs in 6–10% of people.

Causes

Seizures have a number of causes. Of those who have a seizure, about 25% have epilepsy. A number of conditions are associated with seizures but are not epilepsy including: most febrile seizures and those that occur around an acute infection, stroke, or toxicity. These seizures are known as "acute symptomatic" or "provoked" seizures and are part of the seizure-related disorders. In many the cause is unknown.

Different causes of seizures are common in certain age groups.

  • Seizures in babies are most commonly caused by hypoxic ischemic encephalopathy, central nervous system (CNS) infections, trauma, congenital CNS abnormalities, and metabolic disorders.
  • The most frequent cause of seizures in children is febrile seizures, which happen in 2–5% of children between the ages of six months and five years.
  • During childhood, well-defined epilepsy syndromes are generally seen.
  • In adolescence and young adulthood, non-compliance with the medication regimen and sleep deprivation are potential triggers.
  • Pregnancy and labor and childbirth, and the post-partum, or post-natal period (after birth) can be at-risk times, especially if there are certain complications like pre-eclampsia.
  • During adulthood, the likely causes are alcohol related, strokes, trauma, CNS infections, and brain tumors.
  • In older adults, cerebrovascular disease is a very common cause. Other causes are CNS tumors, head trauma, and other degenerative diseases that are common in the older age group, such as dementia.

Metabolic

Dehydration can trigger epileptic seizures if it is severe enough. A number of disorders including: low blood sugar, low blood sodium, hyperosmolar nonketotic hyperglycemia, high blood sodium, low blood calcium and high blood urea levels may cause seizures. As may hepatic encephalopathy and the genetic disorder porphyria.

Structural

Medications

Both medication and drug overdoses can result in seizures, as may certain medication and drug withdrawal. Common drugs involved include: antidepressants, antipsychotics, cocaine, insulin, and the local anaesthetic lidocaine. Difficulties with withdrawal seizures commonly occur after prolonged alcohol or sedative use, a condition known as delirium tremens. In people who are at risk of developing epileptic seizures, common herbal medicines such as ephedra, ginkgo biloba and wormwood can provoke seizures.

Infections

  • Infection with the pork tapeworm, which can cause neurocysticercosis, is the cause of up to half of epilepsy cases in areas of the world where the parasite is common.
  • Parasitic infections such as cerebral malaria. In Nigeria this is one of the most common causes of seizures among children under five years of age.
  • Infection, such as encephalitis or meningitis

Stress

Stress can induce seizures in people with epilepsy, and is a risk factor for developing epilepsy. Severity, duration, and time at which stress occurs during development all contribute to frequency and susceptibility to developing epilepsy. It is one of the most frequently self-reported triggers in patients with epilepsy.

Stress exposure results in hormone release that mediates its effects in the brain. These hormones act on both excitatory and inhibitory neural synapses, resulting in hyper-excitability of neurons in the brain. The hippocampus is known to be a region that is highly sensitive to stress and prone to seizures. This is where mediators of stress interact with their target receptors to produce effects.

Other

Seizures may occur as a result of high blood pressure, known as hypertensive encephalopathy, or in pregnancy as eclampsia when accompanied by either seizures or a decreased level of consciousness. Very high body temperatures may also be a cause. Typically this requires a temperature greater than 42 °C (107.6 °F).

Mechanism

Normally, brain electrical activity is non-synchronous. In epileptic seizures, due to problems within the brain, a group of neurons begin firing in an abnormal, excessive, and synchronized manner. This results in a wave of depolarization known as a paroxysmal depolarizing shift.

Normally after an excitatory neuron fires it becomes more resistant to firing for a period of time. This is due in part from the effect of inhibitory neurons, electrical changes within the excitatory neuron, and the negative effects of adenosine. In epilepsy the resistance of excitatory neurons to fire during this period is decreased. This may occur due to changes in ion channels or inhibitory neurons not functioning properly. Forty-one ion-channel genes and over 1,600 ion-channel mutations have been implicated in the development of epileptic seizure. These ion channel mutations tend to confer a depolarized resting state to neurons resulting in pathological hyper-excitability. This long-lasting depolarization in individual neurons is due to an influx of Ca2+ from outside of the cell and leads to extended opening of Na+ channels and repetitive action potentials. The following hyperpolarization is facilitated by γ-aminobutyric acid (GABA) receptors or potassium (K+) channels, depending on the type of cell. Equally important in epileptic neuronal hyper-excitability, is the reduction in the activity of inhibitory GABAergic neurons, an effect known as disinhibition. Disinhibition may result from inhibitory neuron loss, dysregulation of axonal sprouting from the inhibitory neurons in regions of neuronal damage, or abnormal GABAergic signaling within the inhibitory neuron. Neuronal hyper-excitability results in a specific area from which seizures may develop, known as a "seizure focus". Following an injury to the brain, another mechanism of epilepsy may be the up regulation of excitatory circuits or down regulation of inhibitory circuits. These secondary epilepsies occur through processes known as epileptogenesis. Failure of the blood–brain barrier may also be a causal mechanism. While blood-brain barrier disruption alone does appear to cause epileptogenesis, it has been correlated to increased seizure activity. Furthermore, it has been implicated in chronic epileptic conditions through experiments inducing barrier permeability with chemical compounds. Disruption may lead to fluid leaking out of the blood vessels into the area between cells and driving epileptic seizures. Preliminary findings of blood proteins in the brain after a seizure support this theory.

Focal seizures begin in one hemisphere of the brain while generalized seizures begin in both hemispheres. Some types of seizures may change brain structure, while others appear to have little effect. Gliosis, neuronal loss, and atrophy of specific areas of the brain are linked to epilepsy but it is unclear if epilepsy causes these changes or if these changes result in epilepsy.

Seizure activity may be propagated through the brain's endogenous electrical fields. Proposed mechanisms that may cause the spread and recruitment of neurons include an increase in K+ from outside the cell, and increase of Ca2+ in the presynaptic terminals. These mechanisms blunt hyperpolarization and depolarizes nearby neurons, as well as increasing neurotransmitter release.

Diagnosis

The 2017 ILAE classification of seizure types and the epilepsies (click to read full text)

Seizures may be divided into provoked and unprovoked. Provoked seizures may also be known as "acute symptomatic seizures" or "reactive seizures". Unprovoked seizures may also be known as "reflex seizures". Depending on the presumed cause blood tests and lumbar puncture may be useful. Hypoglycemia may cause seizures and should be ruled out. An electroencephalogram and brain imaging with CT scan or MRI scan is recommended in the work-up of seizures not associated with a fever.

Classification

Seizure types are organized by whether the source of the seizure is localized (focal seizures) or distributed (generalized seizures) within the brain. Generalized seizures are divided according to the effect on the body and include tonic-clonic (grand mal), absence (petit mal), myoclonic, clonic, tonic, and atonic seizures. Some seizures such as epileptic spasms are of an unknown type.

Focal seizures (previously called partial seizures) are divided into simple partial or complex partial seizure. Current practice no longer recommends this, and instead prefers to describe what occurs during a seizure.

The classification of seizures can also be made according to dynamical criteria, observable in electrophysiological measurements. It is a classification according to their type of onset and offset.

Physical examination

An individual who has bitten the tip of their tongue while having a seizure

Most people are in a postictal state (drowsy or confused) following a seizure. They may show signs of other injuries. A bite mark on the side of the tongue helps confirm a seizure when present, but only a third of people who have had a seizure have such a bite. When present in people thought to have had a seizure, this physical sign tentatively increases the likelihood that a seizure was the cause.

Tests

An EEG can aid in locating the focus of the epileptic seizure.

An electroencephalography is only recommended in those who likely had an epileptic seizure and may help determine the type of seizure or syndrome present. In children it is typically only needed after a second seizure. It cannot be used to rule out the diagnosis and may be falsely positive in those without the disease. In certain situations it may be useful to prefer the EEG while sleeping or sleep deprived.

Diagnostic imaging by CT scan and MRI is recommended after a first non-febrile seizure to detect structural problems inside the brain. MRI is generally a better imaging test except when intracranial bleeding is suspected. Imaging may be done at a later point in time in those who return to their normal selves while in the emergency room. If a person has a previous diagnosis of epilepsy with previous imaging repeat imaging is not usually needed with subsequent seizures.

In adults, testing electrolytes, blood glucose and calcium levels is important to rule these out as causes, as is an electrocardiogram. A lumbar puncture may be useful to diagnose a central nervous system infection but is not routinely needed. Routine antiseizure medical levels in the blood are not required in adults or children. In children additional tests may be required.

A high blood prolactin level within the first 20 minutes following a seizure may be useful to confirm an epileptic seizure as opposed to psychogenic non-epileptic seizure. Serum prolactin level is less useful for detecting partial seizures. If it is normal an epileptic seizure is still possible and a serum prolactin does not separate epileptic seizures from syncope. It is not recommended as a routine part of diagnosis epilepsy.

Differential diagnosis

Differentiating an epileptic seizure from other conditions such as syncope can be difficult. Other possible conditions that can mimic a seizure include: decerebrate posturing, psychogenic seizures, tetanus, dystonia, migraine headaches, and strychnine poisoning. In addition, 5% of people with a positive tilt table test may have seizure-like activity that seems due to cerebral hypoxia. Convulsions may occur due to psychological reasons and this is known as a psychogenic non-epileptic seizure. Non-epileptic seizures may also occur due to a number of other reasons.

Prevention

A number of measures have been attempted to prevent seizures in those at risk. Following traumatic brain injury anticonvulsants decrease the risk of early seizures but not late seizures.

In those with a history of febrile seizures, some medications (both antipyretics and anticonvulsants) have been found effective for reducing reoccurrence, however due to the frequency of adverse effects and the benign nature of febrile seizures the decision to use medication should be weighted carefully against potential negative effects.

There is no clear evidence that antiepileptic drugs are effective or not effective at preventing seizures following a craniotomy, following subdural hematoma, after a stroke, or after subarachnoid haemorrhage, for both people who have had a previous seizure, and those who have not.

Management

Potentially sharp or dangerous objects should be moved from the area around a person experiencing a seizure so that the individual is not hurt. After the seizure, if the person is not fully conscious and alert, they should be placed in the recovery position. A seizure longer than five minutes, or two or more seizures occurring within the time of five minutes is a medical emergency known as status epilepticus. Contrary to a common misconception, bystanders should not attempt to force objects into the mouth of the person having a seizure, as doing so may cause injury to the teeth and gums.

Treatments of a person that is actively seizing follows a progression from initial response, through first line, second line, and third line treatments. The initial response involves ensuring the person is protected from potential harms (such as nearby objects) and managing their airway, breathing, and circulation. Airway management should include placing the person on their side, known as the recovery position, to prevent them from choking. If they are unable to breathe because something is blocking their airway, they may require treatments to open their airway.

Medication

The first line medication for an actively seizing person is a benzodiazepine, with most guidelines recommending lorazepam. Diazepam and midazolam are alternatives. This may be repeated if there is no effect after 10 minutes. If there is no effect after two doses, barbiturates or propofol may be used.

Second-line therapy for adults is phenytoin or fosphenytoin and phenobarbital for children. Third-line medications include phenytoin for children and phenobarbital for adults.

Ongoing anti-epileptic medications are not typically recommended after a first seizure except in those with structural lesions in the brain. They are generally recommended after a second one has occurred. Approximately 70% of people can obtain full control with continuous use of medication. Typically one type of anticonvulsant is preferred. Following a first seizure, while immediate treatment with an anti-seizure drug lowers the probability of seizure recurrence up to five years it does not change the risk of death and there are potential side effects.

In seizures related to toxins, up to two doses of benzodiazepines should be used. If this is not effective pyridoxine is recommended. Phenytoin should generally not be used.

There is a lack of evidence for preventive anti-epileptic medications in the management of seizures related to intracranial venous thrombosis.

Other

Helmets may be used to provide protection to the head during a seizure. Some claim that seizure response dogs, a form of service dog, can predict seizures. Evidence for this, however, is poor. At present there is not enough evidence to support the use of cannabis for the management of seizures, although this is an ongoing area of research. There is low quality evidence that a ketogenic diet may help in those who have epilepsy and is reasonable in those who do not improve following typical treatments.

Prognosis

Following a first seizure, the risk of more seizures in the next two years is 40–50%. The greatest predictors of more seizures are problems either on the electroencephalogram or on imaging of the brain. In adults, after 6 months of being seizure-free after a first seizure, the risk of a subsequent seizure in the next year is less than 20% regardless of treatment. Up to 7% of seizures that present to the emergency department (ER) are in status epilepticus. In those with a status epilepticus, mortality is between 10% and 40%. Those who have a seizure that is provoked (occurring close in time to an acute brain event or toxic exposure) have a low risk of re-occurrence, but have a higher risk of death compared to those with epilepsy.

Epidemiology

Approximately 8–10% of people will experience an epileptic seizure during their lifetime. In adults, the risk of seizure recurrence within the five years following a new-onset seizure is 35%; the risk rises to 75% in persons who have had a second seizure. In children, the risk of seizure recurrence within the five years following a single unprovoked seizure is about 50%; the risk rises to about 80% after two unprovoked seizures. In the United States in 2011, seizures resulted in an estimated 1.6 million emergency department visits; approximately 400,000 of these visits were for new-onset seizures. The exact incidence of epileptic seizures in low-income and middle-income countries is unknown, however it probably exceeds that in high-income countries. This may be due to increased risks of traffic accidents, birth injuries, and malaria and other parasitic infections.

History

Epileptic seizures were first described in an Akkadian text from 2000 B.C. Early reports of epilepsy often saw seizures and convulsions as the work of "evil spirits". The perception of epilepsy, however, began to change in the time of Ancient Greek medicine. The term "epilepsy" itself is a Greek word, which is derived from the verb "epilambanein", meaning "to seize, possess, or afflict". Although the Ancient Greeks referred to epilepsy as the "sacred disease", this perception of epilepsy as a "spiritual" disease was challenged by Hippocrates in his work On the Sacred Disease, who proposed that the source of epilepsy was from natural causes rather than supernatural ones.

Early surgical treatment of epilepsy was primitive in Ancient Greek, Roman and Egyptian medicine. The 19th century saw the rise of targeted surgery for the treatment of epileptic seizures, beginning in 1886 with localized resections performed by Sir Victor Horsley, a neurosurgeon in London. Another advancement was that of the development by the Montreal procedure by Canadian neurosurgeon Wilder Penfield, which involved use of electrical stimulation among conscious patients to more accurately identify and resect the epileptic areas in the brain.

Society and culture

Economics

Seizures result in direct economic costs of about one billion dollars in the United States. Epilepsy results in economic costs in Europe of around €15.5 billion in 2004. In India, epilepsy is estimated to result in costs of US$1.7 billion or 0.5% of the GDP. They make up about 1% of emergency department visits (2% for emergency departments for children) in the United States.

Driving

Many areas of the world require a minimum of six months from the last seizure before people can drive a vehicle.

Research

Scientific work into the prediction of epileptic seizures began in the 1970s. Several techniques and methods have been proposed, but evidence regarding their usefulness is still lacking.

Two promising areas include gene therapy, and seizure detection and seizure prediction.

Gene therapy for epilepsy consists of employing vectors to deliver pieces of genetic material to areas of the brain involved in seizure onset.

Seizure prediction is a special case of seizure detection in which the developed systems is able to issue a warning before the clinical onset of the epileptic seizure.

Computational neuroscience has been able to bring a new point of view on the seizures by considering the dynamical aspects.

Anti-Ballistic Missile Treaty

Anti-Ballistic Missile Treaty
Launch of a US Army Nike Zeus missile, the first ABM system to enter widespread testing
TypeBilateral treaty
Signed26 May 1972
LocationMoscow, Russian SFSR, USSR
Signatories
Parties
Ratifiers

The Anti-Ballistic Missile Treaty (ABM Treaty or ABMT) (1972–2002) was an arms control treaty between the United States and the Soviet Union on the limitation of the anti-ballistic missile (ABM) systems used in defending areas against ballistic missile-delivered nuclear weapons. It was intended to reduce pressures to build more nuclear weapons to maintain deterrence. Under the terms of the treaty, each party was limited to two ABM complexes, each of which was to be limited to 100 anti-ballistic missiles.

Signed in 1972, it was in force for the next 30 years. In 1997, five years after the dissolution of the Soviet Union, four former Soviet republics agreed with the United States to succeed the USSR's role in the treaty. Citing risks of nuclear blackmail, the United States withdrew from the treaty in June 2002, leading to its termination.

Background

Deployment history of land based ICBM 1959–2014

Throughout the late 1950s and into the 1960s, the United States and the Soviet Union had been developing missile systems with the ability to shoot down incoming Intercontinental ballistic missile (ICBM) warheads. During this period, the US considered the defense of the US as part of reducing the overall damage inflicted in a full nuclear exchange. As part of this defense, Canada and the US established the North American Air Defense Command (now called North American Aerospace Defense Command).

By the early 1950s, US research on the Nike Zeus missile system had developed to the point where small improvements would allow it to be used as the basis of an operational ABM system. Work started on a short-range, high-speed counterpart known as Sprint to provide defense for the ABM sites themselves. By the mid-1960s, both systems showed enough promise to start development of base selection for a limited ABM system dubbed Sentinel. In 1967, the US announced that Sentinel itself would be scaled down to the smaller and less expensive Safeguard. Soviet doctrine called for development of its own ABM system and return to strategic parity with the US. This was achieved with the operational deployment of the A-35 ABM system and its successors, which remain operational to this day.

The development of multiple independently targetable reentry vehicle (MIRV) systems allowed a single ICBM to deliver as many as ten separate warheads at a time. An ABM defense system could be overwhelmed with the sheer number of warheads. Upgrading it to counter the additional warheads would be economically unfeasible: The defenders required one rocket per incoming warhead, whereas the attackers could place 10 warheads on a single missile at a reasonable cost. To further protect against ABM systems, the Soviet MIRV missiles were equipped with decoys; R-36M heavy missiles carried as many as 40. These decoys would appear as warheads to an ABM, effectively requiring engagement of five times as many targets and rendering defense even less effective.

ABM Treaty

Jimmy Carter and Leonid Brezhnev signing SALT II treaty, 18 June 1979, in Vienna

The United States first proposed an anti-ballistic missile treaty at the 1967 Glassboro Summit Conference during discussions between U.S. Secretary of Defense Robert McNamara and Chairman of the Council of Ministers of the Soviet Union Alexei Kosygin. McNamara argued both that ballistic missile defense could provoke an arms race, and that it might provoke a first-strike against the nation fielding the defense. Kosygin rejected this reasoning. They were trying to minimize the number of nuclear missiles in the world. Following the proposal of the Sentinel and Safeguard decisions on American ABM systems, the Strategic Arms Limitation Talks began in November 1969 (SALT I). By 1972 an agreement had been reached to limit strategic defensive systems. Each country was allowed two sites at which it could base a defensive system, one for the capital and one for ICBM silos.

The treaty was signed during the 1972 Moscow Summit on 26 May by the President of the United States, Richard Nixon and the General Secretary of the Communist Party of the Soviet Union, Leonid Brezhnev; and ratified by the US Senate on 3 August 1972.

The 1974 Protocol reduced the number of sites to one per party, largely because neither country had developed a second site. The sites were Moscow for the USSR and the North Dakota Safeguard Complex for the US, which was already under construction.

Missiles limited by the treaty

The Treaty limited only ABMs capable of defending against "strategic ballistic missiles", without attempting to define "strategic". It was understood that both ICBMs and SLBMs are obviously "strategic". Neither country intended to stop the development of counter-tactical ABMs. The topic became disputable as soon as most potent counter-tactical ABMs started to be capable of shooting down SLBMs (SLBMs naturally tend to be much slower than ICBMs), nevertheless both sides continued counter-tactical ABM development.

After the SDI announcement

President Reagan delivering the 23 March 1983 speech initiating SDI

On 23 March 1983, Ronald Reagan announced the Strategic Defense Initiative, a research program into ballistic missile defense which would be "consistent with our obligations under the ABM Treaty". Reagan was wary of mutual deterrence with what he had recently called an "Evil Empire", and wanted to escape the traditional confines of mutual assured destruction. The project was a blow to Yuri Andropov's so-called "peace offensive". Andropov said that "It is time [Washington] stopped thinking up one option after another in search of the best way of unleashing nuclear war in the hope of winning it. To do this is not just irresponsible. It is madness".

Regardless of the opposition, Reagan gave every indication that SDI would not be used as a bargaining chip and that the United States would do all in its power to build the system. The Soviets were threatened because the Americans might have been able to make a nuclear first strike possible. In The Nuclear Predicament, Beckman claims that one of the central goals of Soviet diplomacy was to terminate SDI. A surprise attack from the Americans would destroy much of the Soviet ICBM fleet, allowing SDI to defeat a "ragged" Soviet retaliatory response. Furthermore, if the Soviets chose to enter this new arms race, they would further cripple their economy. The Soviets could not afford to ignore Reagan's new endeavor, therefore their policy at the time was to enter negotiations with the Americans. By 1987, however, the USSR withdrew its opposition, concluding the SDI posed no threat and scientifically "would never work".

SDI research went ahead, although it did not achieve the hoped-for result. SDI research was cut back following the end of Reagan's presidency, and in 1995 it was reiterated in a presidential joint statement that "missile defense systems may be deployed... [that] will not pose a realistic threat to the strategic nuclear force of the other side and will not be tested to... [create] that capability." This was reaffirmed in 1997.

Theater Missile Defense negotiations

The ABM Treaty prohibited "National Missile Defense" (NMD), but some interpreted it to allow more limited systems called "Theater Missile Defense" (TMD). This is because Article II of the treaty defined "ABM Systems" as those that "counter strategic missiles", which are typically defined as those with "intercontinental capability". Thus, TMD supporters argued, the treaty did not prohibit systems that defended against the countering of theatre ballistic missiles. The US had already developed and used such systems, including the Patriot Missile during the Gulf War.

The problem arose as TMD systems could also potentially be capable of countering strategic ballistic missiles, not just theatre ballistic missiles. The Clinton administration began negotiations with the Russians in 1993 to make amendments to the treaty. After much discussion, Presidents Clinton and Boris Yeltsin signed addendum to the treaty on September 9, 1997. According to these new agreements, the treaty permitted missile defense systems to have a velocity up to 5 km/s as long as it had not been tested against targets traveling faster than 5 km/s.

The 1997 agreement were eventually ratified by the Russian parliament on May 4, 2000 (along with START II treaty). However, it was opposed in the US Senate by some Republican senators led by Jesse Helms. As a result, Clinton never submitted the agreement to Congress, fearing that Helms would stall their ratification or defeat it outright.

After the dissolution of the USSR; United States and Russia

Presidents Vladimir Putin and George W. Bush sign SORT on 24 May 2002 in Moscow.

Although the Soviet Union ceased to exist in December 1991, in the view of the U.S. Department of State, the treaty continued in force. Russia was confirmed as the USSR's successor state in January 1992. Belarus and Ukraine were treated as successors at the ABM review conference in October 1993 and Kazakhstan was added as a successor shortly after. Belarus, Ukraine and Kazakhstan became regular participants at ABM treaty meetings known as Standing Consultative Commissions. An additional memorandum of understanding was prepared in 1997, establishing Belarus, Kazakhstan, the Russian Federation, and Ukraine as successor states to the Soviet Union, for the purposes of the treaty. The US considered only extending the obligations to these countries, and not all, as only these ones had significant ABM assets. As the ABM treaty allowed for only a single ABM deployment, the State Department deemed that only a single ABM system would be collectively permitted among Russia, Ukraine, Kazakhstan and Belarus.

In the United States, there was a debate on whether after the dissolution of the USSR, the ABM Treaty was still in effect. A month after the USSR's dissolution, President George H. W. Bush affirmed the ABM Treaty and regarded Russia as USSR's successor. Russia also accepted the ABM Treaty. Later on, President Clinton would affirm the validity of the treaty, as would President George W. Bush (before he terminated it). However, some Americans (mostly conservative Republicans) argued that the treaty was not in effect because the USSR had no successor state. This was deemed inconsistent, as Russia did indeed inherit the USSR's obligations (including its UNSC seat, its debts, its agreements on nonproliferation etc.). Former CIA director James Woolsey argued that in order for the treaty to remain in force, both the US and Russia had to accept it, and that President Clinton could not accept it without Congressional approval. According to Michael J. Glennon, Congress acknowledged the treaty in 1996, when it passed a law restricting President Clinton's ability to modify the treaty.

United States withdrawal

On 13 December 2001, George W. Bush gave Russia notice of the United States' withdrawal from the treaty, in accordance with the clause that required six months' notice before terminating the pact—the first time in recent history that the United States has withdrawn from a major international arms treaty. This led to the eventual creation of the American Missile Defense Agency.

Supporters of the withdrawal argued that it was a necessity in order to test and build a limited National Missile Defense to protect the United States from nuclear blackmail by a rogue state. But, the withdrawal had many foreign and domestic critics, who said the construction of a missile defense system would lead to fears of a U.S. nuclear first strike, as the missile defense could blunt the retaliatory strike that would otherwise deter such a preemptive attack. John Rhinelander, a negotiator of the ABM treaty, predicted that the withdrawal would be a "fatal blow" to the Non-Proliferation Treaty and would lead to a "world without effective legal constraints on nuclear proliferation". Former U.S. Secretary of Defense William Perry also criticized the U.S. withdrawal as a very bad decision.

Russian response

Newly elected Russian president Vladimir Putin responded to the withdrawal by ordering a build-up of Russia's nuclear capabilities, designed to counterbalance U.S. capabilities, although he noted there was no immediate danger stemming from the US withdrawal.

Russia and the United States signed the Strategic Offensive Reductions Treaty in Moscow on 24 May 2002. This treaty mandates cuts in deployed strategic nuclear warheads, but without actually mandating cuts to total stockpiled warheads, and without any mechanism for enforcement.

On June 13, 2002, the US withdrew from ABM (having given notice 6 months earlier). The next day, Russia responded by declaring it would no longer abide by the START II treaty, which had not entered into force.

In interviews with Oliver Stone in 2017, Russian president Vladimir Putin said that in trying to persuade Russia to accept US withdrawal from the treaty, both Bill Clinton and George W. Bush had tried, without evidence, to convince him of an emerging nuclear threat from Iran.

On 1 March 2018, Russian president Vladimir Putin, in an address to the Federal Assembly, announced the development of a series of technologically new "super weapons" in response to U.S. withdrawal from the ABM Treaty. His statements were referred to by an anonymous US official under the Trump administration as largely boastful untruths. He said that the U.S. decision triggered him to order an increase in Russia's nuclear capabilities, designed to counterbalance U.S. ones.

In 2021, Putin cited U.S. withdrawal among his grievances against the West: "We tried to partner with the West for many years, but the partnership was not accepted, it didn't work," often citing it as one of America's great post-Cold War sins.

Connected car

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