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PALLIATIVE SEDATION Myth, Mercy or Euphemism?

Nova Scotia Hospice Palliative Care Association Annual Conference 2011. PALLIATIVE SEDATION Myth, Mercy or Euphemism?. Dr Nigel Sykes St Christopher's Hospice London. A Confusion of Terms. Terms: Palliative sedation Terminal sedation Early terminal sedation Palliative sedation therapy

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PALLIATIVE SEDATION Myth, Mercy or Euphemism?

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  1. Nova Scotia Hospice Palliative Care Association Annual Conference 2011 PALLIATIVE SEDATIONMyth, Mercy or Euphemism? Dr Nigel SykesSt Christopher's HospiceLondon

  2. A Confusion of Terms • Terms: • Palliative sedation • Terminal sedation • Early terminal sedation • Palliative sedation therapy • Primary sedation • Secondary sedation • Proportionate sedation • Controlled sedation for intractable distress in the dying • Sudden sedation • Continuous deep sedation

  3. A Manifold Definition of Palliative Sedation (Adapted from Jones, 2011) Palliative Sedation is the use of sedatives that is either continuous or intermittent; deep or mild; the primary or secondary pharmacological effect; proportionate or disproportionate to ‘refractory symptoms’ ; which include or do not include ‘existential distress’; in a patient who is or is not imminently dying; at the request or not of the patient; who intends or does not intend to be unconscious until death; with the doctor also intending this or not; withholding or not withholding nutrition and hydration; with or without an advance refusal; such that this protocol does or does not actually hasten death; and is intended or is not intended to do so by the patient; and is intended or is not intended to do so by the patient This yields 4,782,969 possible definitions of Palliative Sedation…

  4. Is the likely clinical effect of this Definition… • Palliative Sedation is the use of sedatives that is intermittent; mild; proportionate to ‘refractory symptoms’ ; in a patient who is imminently dying; not withholding nutrition and hydration

  5. …the same as the likely clinical effect of this Definition? • Palliative Sedation is the use of sedatives that is continuous, deep, disproportionate to ‘refractory symptoms’ ; in a patient who is not imminently dying but is intended to be unconscious until death; withholding nutrition and hydration A Euphemism for Euthanasia?

  6. A Confusion of Purposes Sedation can mean: • The giving of sedatives for specific symptom control, e.g. • Seizures • Delirium in the absence of correctable factors • A treatment for insomnia • The attempt to make a patient unaware of a intractable symptom by reducing their conscious level An expert survey achieved only 40% agreement with a single definition of sedation(Chater, 1998)

  7. What is an intractable symptom? An "intractable" symptom is one: • that does not respond to available treatment or • for which the treatment is unacceptable to the patient because of: • insufficiently rapid action or • excessive side effects (Cherny and Portenoy, 1994) Sedation is used significantly more often by doctors who predict that a symptom will be intractable than by those who actually try all the treatments (Morita, 2004)

  8. Reasons for sedation Multicentre study of 387 terminally ill patients • Haemorrhage 0.8% • Distress 1.8% • Pain 1.8% • Nausea and vomiting 2.3% • Breathlessness 6.5% • Delirium 15.2% (Fainsinger et al., 2000)

  9. How often is sedation used in Palliative Care? Reports of the proportion of patients who requiresedation in the closing days of life vary widely: • 1% (Fainsinger,1998) • 88% (Turner et al., 1996) • This situation is not getting any better: • Prospective study of the use of all depths and lengths of sedation in eight palliative care units showed a rate of 7.5% (Claessens et al, 2011) • Retrospective study from one palliative care unit of the use specifically of continuous deep sedation showed a rate of 43% (Rietjens et al., 2008)

  10. Sedation in Palliative Care • The use of sedative drugs has always been a part of Palliative Care at the end of life: • For mental distress (but only as an adjunct to the giving of properly attentive time) (Saunders, 1960) • For anxiety or agitated confusion (Saunders, 1965) • Opiates should not be used as sedatives (Saunders, 1958) “It should hardly ever be necessary to use the very heavy sedation that completely smothers the patient’s personality, although many who see these patients only occasionally do not believe that it is possible to avoid this” (Saunders, 1967)

  11. “Very heavy sedation that completely smothers the patient’s personality” • The crux of ethical and clinical concern seems to be whether sedative use: • Obliterates the patient’s personality and destroys the possibility of further emotional and spiritual development • Kills the patient Sedatives can do both these things

  12. Sedation for intractable symptoms The paramount moral obligation is to relieve suffering • “A doctor who leaves a patient to suffer intolerably is morally more reprehensible than the doctor who performs euthanasia” Twycross, 1996 Mercy

  13. Principle of Double Effect(The Get-out Clause) • A harmful effect of treatment, even resulting in death, is permissible providing that it: • was not intended and • arises as a side effect of a beneficial action and • the harmful effect was not the means of achieving the beneficial effect • But if we need to invoke the Principle of Double Effect does this suggest we are routinely shortening patients’ lives by sedation? Truth or Myth?

  14. Classification of end of life care sedation(Broeckaert, 2000)

  15. Classification of end of life care sedation(Morita, Tsuneto and Shima, 2001)

  16. How is depth of sedation assessed? • Glasgow Coma Scale (Teasdale and Jennett, 1974) • Communication Capacity Scale (Morita et al., 2001) • Consciousness Scale for Palliative Care (Goncalves et al.,2008) • Physicians’ unsubstantiated report • Assessment of the deepest sedation requires infliction of pain: • Supra-orbital pressure (GCS) • Pain (unspecified method) or change in position (CCS) • Trapezius pinch (CSPC) • How willing are palliative care staff to carry out these assessments routinely?

  17. Depth of Sedation • It has been suggested that the depth of sedation tends to increase as death approaches • 45% of patients originally given ‘mild’ sedation had ‘deep continuous’ sedation by two days before death (Claessens et al., 2011) • But this is based on only 9 patients and it is not clear how the sedative doses changed in the interim • How different is this from the natural trajectory of dying? • 50% of Palliative Care not receiving sedatives are unable to manage complex communication five days before death (Morita et al., 2003)

  18. What is in the Name? • The root of the word sedation isthe Latin sedatio meaning ‘soothing’ or ‘allaying’ • The clinical purpose of sedative drugs in palliation is the reduction of irritability or agitation, i.e. the relief of distress • Sleep is not the intention but may occur either: • if a high enough sedative dose is required to relieve the distress or • If a tired, ill patient is enabled to be comfortable and relaxed

  19. Continuousness • Sedation is a response to a symptom • Continuous symptoms need continuous relief • See use of regular morphine in chronic pain for details • 30% of patients receiving sedatives do so only on an ‘as required’ basis • Median 2.5mg midazolam on a median of 2 occasions (Dunn et al., 2008) • Liverpool Care Pathway Guidance suggests use of a continuous subcutaneous infusion if two or more ‘as required’ doses of sedative have been given in 24h (NCPC, 2006) • So ‘as required’ rapidly becomes ‘continuous’ Continuous sedative administration is neither rare nor necessarily sinister

  20. Proportionality • There is a growing consensus that the essence of sedative use in Palliative Care is proportionality • Morita, Tsuneto and Shima, 2002 • De Graeff and Dean, 2007 • Brockaert and Claessens, 2009 • Cherny and Radbruch, 2009 • Hasselaar, Verhagen and Vissers, 2009 • Quill et al., 2009 • But not everywhere. The Dutch National Guideline on Palliative Sedation speaks of proportionality but assumes: • The aim is to reduce consciousness • The patient should be within 2 weeks of dying • Administration of fluids should be stopped • A doctor should be present at initiation of sedation (KNMG 2005/2009)

  21. Proportionate Responses are key to Palliative Care Practice • The mode of use of sedatives is analogous to that of other symptom control measures, such as opioids for pain: • A low initial dose is titrated higher against the response until distress is relieved, i.e. the dose used is proportional to severity of distress • Relief of distress is the end-point, not a particular level of consciousness

  22. What is a Proportionate Dose of Sedative? • Midazolam is the most commonly used sedative in Palliative Care (Sykes and Thorns, 2003a) • Mean midazolam doses reported range from 22 to 70mg/24h (Mercadante et al., 2009) • But individually as high as 240mg/24h • In our study of 238 patients: • Overall mean midazolam dose was 25.7 mg/24 h • Mean midazolam dose for patients receiving sedation throughout the last week of life was 54.5 mg/24 h (Sykes and Thorns, 2003b)

  23. Effect of Sedation on Palliative Care patients’ Survival

  24. Duration of Sedation • Mean duration of sedation estimated to be 2.5 days (range 1.3-3.9) • Based on ten studies, totalling 1,900 patients(Porta Sales, 2001 updated) Suggests that sedation is generally a response to symptoms associated with the onset of dying

  25. Midazolam use at St Christopher’s In a random recent month: • 55 patients died • 51 (93%) had at least one dose • 35 (64%) had a continuous s.c. infusion • 14 (40%) of infusions started within 48h of death • 14 (40%) of infusions started 3 to 7 days before death • All had either already stopped eating or ate until 3 to 5 days before death • 7 (20%) infusions lasted between one week and one month • Of these patients five continued to eat until 3 to 5 days before death • The other two had gastrostomy feeding Was our sedation rate 93% or zero?

  26. Case History 1 58 year old man with astrocytoma • General condition noted to be deteriorating • Developed an acute onset of violent agitation and paranoia • Midazolam 20mg given i.m. stat followed by 55mg/24h by s.c. infusion • Died 55 hours later

  27. Case History 2 70 year old woman with lung cancer and a previous history of schizophrenia • Admitted because of general deterioration • Developed delusions and progressive agitation unresponsive to haloperidol doses up to 12mg per day • Over 24h she received 125 mg levomepromazine and 60 mg midazolam by s.c. infusion, but also another 60 mg midazolam and 200 mg levomepromazine in s.c stat doses for continuing agitation • At the end of this period her breathing was noted to be noisy. 200 mg phenobarbital was given s.c. and the patient died 6 h later.

  28. And yet some will ask: • Is sedation used to cover up potentially remediable delirium? • 73% of delirium in palliative care is irreversible • Life expectancy of patients with irreversible delirium is under 17 days (Leonard et al., 2008) • What about provision of hydration and nutrition? • This is a separate decision, but the great majority of patients who receive sedatives already have minimal oral intake • What about sedation for existential distress? • Does not correlate with physical deterioration

  29. Use of sedatives in existential or psychological distress • Hard to tell if such distress is really intractable • Level of distress can be variable and idiosyncratic • Standard treatments have low morbidity • Intractability can only be decided by a multiprofessional clinical team skilled in psychological care who know both patient and family and have made repeated assessments • Team access to psychiatry, chaplaincy and ethics is required (Cherny and Radbruch, 2009) • Some sedative use may be helpful, as may respite sedation to provide periods of ‘time out’ • But the induction of sleep for extended periods should be a truly exceptional occurrence

  30. Conclusions • ‘Sedation’ continues to mean different things to different people • In specialist palliative care units use of sedatives in the last days of life is not associated with shortened survival overall • Most use of sedatives is for the management of restlessness and confusion occurring as part of the process of dying • Impaired consciousness is common at the end of life with or without sedatives • The aim of sedative use is to relieve distress, not to induce sleep • The key to ethical use of sedatives is proportionality, whatever the indication

  31. If Palliative Sedation is approached properly… • It will be an act of Mercy for our patients whose distress cannot be relieved by other means • It will be a Myth that it shortens patients’ lives And so • It will not be a Euphemism for Euthanasia

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