Determinants of the Administration of Continuous Palliative Sedation: A Systematic Review

Practices of and Perspectives on Palliative Sedation Among Palliative Care Physicians in Ontario, Canada: A Mixed-Methods Study

Background

Palliative sedation (PS) is a therapeutic intervention employed to manage severe and refractory symptoms in terminally ill patients at end of life. Inconsistencies in PS practice guidelines coupled with clinician ambiguity have resulted in confusion about how PS is best integrated into practice. Understanding the perspectives, experiences, and practices relating to this modality will provide insight into its clinical application and challenges within the palliative care landscape.

Objective

The aim is to explore the perspectives of palliative care physicians administering PS, including how practitioners define PS, factors influencing decision making about the use of PS, and possible reasons for changes in practice patterns over time.

Methods

A survey (n = 37) and semistructured interviews (n = 23) were conducted with palliative care physicians throughout Ontario. Codes were determined collaboratively and applied line-by-line by two independent investigators. Survey responses were analyzed alongside interview transcripts and noted to be concordant. Themes were generated through reflexive thematic analysis.

Results

Five key themes were identified: (1) lack of standardization, (2) differing definitions, (3) logistical challenges, (4) perceived "back-up" to Medical Assistance in Dying, and (5) tool of the most responsible physician.

Conclusion

There was significant variability in how participants defined PS and in frequency of use of PS. Physicians described greater ease implementing PS when practicing in palliative care units, with significant barriers faced by individuals providing home-based palliative care or working as consultants on inpatient units. Educational efforts are required about the intent and practice of PS, particularly among inpatient interprofessional teams.

Palliative sedation determinants: systematic review and meta-analysis in palliative medicine

BACKGROUND

The utilisation of palliative sedation is often favoured by patients approaching end of life due to the presence of multiple difficult-to-manage symptoms during the terminal stage. This study aimed to identify the determinants of the use of palliative sedation.

METHODS

To identify pertinent observational studies, a comprehensive search was performed in PubMed, Embase, Cochrane Library, and PsycINFO databases from their inception until March 2022. The methodological quality of the chosen prospective and retrospective cohort studies was assessed using the Newcastle Ottawa Scale, while the Agency for Healthcare Research and Quality was used to evaluate the methodological quality of the selected cross-sectional studies. For each potential determinant of interest, the collected data were synthesised and analysed, and in cases where data could not be combined, a narrative synthesis approach was adopted.

RESULTS

A total of 21 studies were analysed in this research, consisting of 4 prospective cohort studies, 7 retrospective cohort studies, and 10 cross-sectional studies. The findings indicated that several determinants were significantly associated with palliative sedation. These determinants included younger age, male gender, presence of tumours, dyspnoea, pain, delirium, making advanced medical end-of-life decisions, and dying in a hospital setting.

CONCLUSIONS

The findings of our review could help physicians identify patients who may need palliative sedation in advance and implement targeted interventions to reverse refractory symptoms, develop personalized palliative sedation programs, and ultimately improve the quality of palliative care services.

TRIAL REGISTRATION

PROSPERO registration number CRD42022324720.

Sedation practices in palliative care services across France: a nationwide point-prevalence analysis

OBJECTIVES

Terminally ill patients may require sedation to relieve refractory suffering. The prevalence and modalities of this practice in palliative care services remain unclear. This study estimated the prevalence of all sedation leading to a deep unconsciousness, whether transitory, with an undetermined duration, or maintained until death, for terminally ill patients referred to a home-based or hospital-based palliative care service.

METHODS

We conducted a national, multicentre, observational, prospective, cross-sectional study. In total, 331 centres participated, including academic/non-academic and public/private institutions. The participating institutions provided hospital-based or home-based palliative care for 5714 terminally ill patients during the study.

RESULTS

In total, 156 patients received sedation (prevalence of 2.7%; 95% CI, 2.3 to 3.2); these patients were equally distributed between 'transitory', 'undetermined duration' and 'maintained until death' sedation types. The prevalence was 0.7% at home and 8.0% in palliative care units. The median age of the patients was 70 years (Q1-Q3: 61-83 years); 51% were women and 78.8% had cancers. Almost all sedation events occurred at a hospital (90.4%), mostly in specialised beds (74.4%). In total, 39.1% of patients were unable to provide consent; only two had written advance directives. A collegial procedure was implemented in 80.4% of sedations intended to be maintained until death. Midazolam was widely used (85.9%), regardless of the sedation type.

CONCLUSIONS

This nationwide study provides insight into sedation practices in palliative care institutions. We found a low prevalence for all practices, with the highest prevalence among most reinforced palliative care providers, and an equal frequency of all practices.

Continuous palliative sedation in terminally ill patients with cancer: a retrospective observational cohort study from a Chinese palliative care unit

OBJECTIVE

This study aimed to describe a 4-year practice of continuous palliative sedation (CPS) in a palliative medicine ward of an academic hospital in China. To compare the survival time of patients with cancer with and without CPS during end-of-life care, we used the propensity score matching method and explored potential patient-related factors.

DESIGN

A retrospective observational cohort study.

SETTING

The palliative ward at a tertiary teaching hospital between January 2018 and 10 May 2022, in Chengdu, Sichuan, China.

PARTICIPANTS

The palliative care unit had 1445 deaths. We excluded 283 patients who were sedated on admission due to mechanical ventilation or non-invasive ventilators, 122 patients who were sedated due to epilepsy and sleep disorders, 69 patients without cancer, 26 patients who were younger than 18 years, 435 patients with end-of-life intervention when the patients' vital signs were unstable and 5 patients with unavailable medical records. Finally, we included 505 patients with cancer who met our requirements.

MAIN OUTCOME MEASURES

The survival time and analysis of sedation potential factors between the two groups were compared.

RESULTS

The total prevalence of CPS was 39.7%. Patients who were sedated more commonly experienced delirium, dyspnoea, refractory existential or psychological distress, and pain. After propensity score matching, the median survival was 10 (IQR: 5-17.75) and 9 days (IQR: 4-16) with and without CPS, respectively. After matching, the two survival curves of the sedated and non-sedated groups were no different (HR 0.82; 95% CI 0.64 to 0.84; log-rank p=0.10).

CONCLUSIONS

Developing countries also practise palliative sedation. Median survival was not different between patients who were and were not sedated.

Cross-cultural comparison of continuous deep sedation for advanced cancer patients in East Asian countries: prospective cohort study

OBJECTIVE

Cultural, social, and legal factors have been known to affect physicians' practice of continuous deep sedation. There have been few quantitative studies to compare continuous deep sedation practice in Asian countries. We aimed to describe and compare clinical characteristics of continuous deep sedation in Japan, Korea and Taiwan.

METHODS

Patients with advanced cancer admitted to participating palliative care units were enrolled from January 2017 to September 2018. We evaluated and compared (i) the prevalence of continuous deep sedation, (ii) the characteristics of sedated and non-sedated groups in each country, and (iii) continuous deep sedation administration patterns among the three countries.

RESULTS

A total of 2158 participants were included in our analysis, and 264 received continuous deep sedation. The continuous deep sedation prevalence was 10, 16 and 22% in Japan, Korea and Taiwan, respectively. Delirium was the most frequent target symptom in all countries, along with dyspnoea (in Japan) and psychological symptoms (in Korea). Midazolam was most frequently used in Japan and Taiwan, but not in Korea (P < 0.001). Among the patients receiving continuous deep sedation, the hydration amount on the final day was significantly different, with median volumes of 200, 500 and 0 mL in Japan, Korea and Taiwan, respectively (P < 0.001). In Korea, 33% of the continuous deep sedation administration caused a high degree of physicians' discomfort, but 3% in Japan and 5% in Taiwan (P < 0.001).

CONCLUSIONS

Clinical practices of continuous deep sedation and physicians' discomfort related to continuous deep sedation initiation highly varied across countries. We need to develop optimal decision-making models of continuous deep sedation and hydration during continuous deep sedation in each country.

Possible age-related differences in healthcare professionals' perspectives on younger and older patients' autonomy and decision-making in the context of sedation in specialised palliative care: exploratory secondary qualitative content and linguistic conversation analysis of interviews with healthcare professionals

BACKGROUND

Chronic illnesses and multi-morbidity can threaten competence and independence, particularly in old age. Autonomy becomes increasingly important in the context of sedation, as in this case medication leads to (further) changes of consciousness. The study aimed to identify possible age-related differences in the perspectives of healthcare professionals on patients' autonomy, in the context of sedation in specialised palliative care.

METHOD

Secondary analysis of interviews with healthcare professionals, analysed by qualitative content and linguistic conversation analysis. The interviews analysed span 51 healthcare professionals in specialised palliative care across 17 centres (adult inpatient and specialist palliative home care services) in Germany.

RESULTS

The study shows that the perspectives of healthcare professionals on patients' autonomy differs according to the age of the patient in the context of sedation in specialised palliative care. The different perspectives may lead to different ways of treating the patients, for example a greater space of autonomy and decision-making for younger patients.

CONCLUSION

In particular, measures that may restrict consciousness (e.g. sedation) and thus influence patients' ability to fully exercise their autonomy and fully participate in decision-making require special attention by healthcare professionals with respect to possible influences on treatment, such as different perceptions by healthcare professionals based on the patient's age or age-related stereotypes.

TRIAL REGISTRATION

The study "SedPall" is registered in the German Clinical Trials Register (ID: DRKS00015047 ).

Physicians’ Experiences and Perceptions of Environmental Factors Affecting Their Practices of Continuous Deep Sedation until Death: A Secondary Qualitative Analysis of an Interview Study

As previous research has paid little attention to environmental factors affecting the practice of continuous deep sedation until death (CDS), we aimed to explore these using physicians’ experiences and perceptions. We performed an interpretative thematic analysis of primary data from a qualitative interview study conducted from February to May 2019 in Belgium with 47 physicians. Structural factors were identified: the lack of professional and/or technical support in monitoring sedated patients; the use of guidelines in team contexts; the time constraints for treating individual patients and work pressure; the structural knowledge gap in medical education; the legal context for assisted dying; and the lack of a clear legal context for CDS. Cultural factors were identified: the moral reservations of care teams and/or institutions towards CDS; the presence of a palliative care culture within care teams and institutions; the culture of fear of making clinical errors regarding CDS among a group of physicians; the professional stigma of performing assisted dying among some of the physician population; the different understandings of CDS in medical and policy fields; and the societal taboo around suffering at the end of life and natural death. To conclude, improving CDS practice requires a whole-system approach considering environmental factors.

Gender and Observed Complexity in Palliative Home Care: A Prospective Multicentre Study Using the HexCom Model

This study analyses gender differences in the complexity observed in palliative home care through a multicentre longitudinal observational study of patients with advanced disease treated by palliative home care teams in Catalonia (Spain). We used the HexCom model, which includes six dimensions and measures three levels of complexity: high (non-modifiable situation), medium (difficult) and low. Results: N = 1677 people, 44% women. In contrast with men, in women, cancer was less prevalent (64.4% vs. 73.9%) (p < 0.001), cognitive impairment was more prevalent (34.1% vs. 26.6%; p = 0.001) and professional caregivers were much more common (40.3% vs. 24.3%; p < 0.001). Women over 80 showed less complexity in the following subareas: symptom management (41.7% vs. 51,1%; p = 0.011), emotional distress (24.5% vs. 32.8%; p = 0.015), spiritual distress (16.4% vs. 26.4%; p = 0.001), socio-familial distress (62.7% vs. 70.1%; p = 0.036) and location of death (36.0% vs. 49.6%; p < 0.000). Men were more complex in the subareas of "practice" OR = 1.544 (1.25-1.90 p = 0.000) and "transcendence" OR = 1.52 (1.16-1.98 p = 0.002). Observed complexity is related to male gender in people over 80 years of age. Women over the age of 80 are remarkably different from their male counterparts, showing less complexity regarding care for their physical, psycho-emotional, spiritual and socio-familial needs.

[Descriptive analysis of palliative sedation in a pediatric palliative care unit]

INTRODUCTION

Data surrounding palliative sedation in pediatric patients is scarce. Our objective is to assess the utility of creating a quality standard for pediatric palliative sedation.

MATERIAL AND METHODS

A non-systematic review of the literature was used to find recommendations for pediatric palliative sedation, after which a definition was established based on three items: (1) indication, (2) consent, and (3) application. Afterwards, a retrospective analysis of palliative sedations applied by our unit over 5 years was performed.

RESULTS

Out of 163 patients, palliative sedation was applied in 20, in 17 of them by our unit (14/20 males; median: 11.9 years). Twelve patients had oncological diseases, seven had neurological conditions, and one had a polymalformative syndrome. Nine patients had more than one symptom at the time of PS initiation with pain (11/17) and dyspnoea (10/17) being the most frequent. As for the definition, only three patients achieved a global completion, with the registration of the consent, specification of refractoriness and the establishment of an adequate initial sedative dose being the areas with more possible improvement.

CONCLUSIONS

The application of the definition allowed us to analyze and find areas of improvement for our clinical practice of palliative sedation in pediatric patients.

Sedatives and Sedation at the End of Life in Nursing Homes: A Retrospective Multicenter Cohort Study

OBJECTIVES

There is scarce information about sedation in nursing homes at the end of life. We aimed to assess (1) the use of sedatives generally and "sedatives with continuous effect," based on objective operational criteria, within the last week of life in nursing homes and (2) factors associated with this treatment.

DESIGN

Retrospective cohort study, using the nursing homes' medical records.

SETTING AND PARTICIPANTS

Residents who died in 4 German nursing homes from January 2015 to December 2017 and whose medical records were available (n = 512).

METHODS

Sedatives analyzed were those recommended by guidelines for "palliative sedation": benzodiazepines, levomepromazine, haloperidol (≥5 mg/d), and propofol. The definition of "sedatives with continuous effect" and doses judged as at least moderately sedating were consented by palliative care clinicians and pharmacists, based on the literature. Descriptive statistics and multivariate logistic regression analysis were performed (R version 3.6.1).

RESULTS

Overall, 110/512 (21%) deceased residents received a sedative at least once during the last week of life, 46/512 (9%) "sedatives with continuous effect." Oral lorazepam was used most frequently. Eleven of 512 (2%) residents received doses judged as at least moderately sedating. The term sedation was not used. Most frequent indications were agitation (58/110; 53%) and anxiety (35/110; 32%); no indication was noted for 36/110 (33%) residents. The resident's involvement in the decision for sedatives was documented in 3/110 (3%). Multivariate logistic regression analysis showed significant associations between use of sedatives and age (OR = 0.94, P < .001) as well as institution (P < .001).

CONCLUSIONS AND IMPLICATIONS

Our data indicate a lower prevalence of sedation compared to international data and considerable differences regarding prevalence between institutions. These differences, potential setting-specific challenges, and need for support measures for consistent best practice of sedation in nursing homes should be further explored.

Continuous Deep Sedation Until Death-a Swiss Death Certificate Study

BACKGROUND

In the last decade, the number of patients continuously deeply sedated until death increased up to fourfold. The reasons for this increase remain unclear.

OBJECTIVE

To identify socio-demographic and clinical characteristics of sedated patients, and concurrent possibly life-shortening medical end-of-life decisions.

DESIGN

Cross-sectional death certificate study in German-speaking Switzerland in 2001 and 2013.

PARTICIPANTS

Non-sudden and expected deaths (2001: N = 2281, 2013: N = 2256) based on a random sample of death certificates and followed by an anonymous survey on end-of-life practices among attending physicians.

MAIN MEASURES

Physicians' reported proportion of patients continuously deeply sedated until death, socio-demographic and clinical characteristics, and possibly life-shortening medical end-of life decisions.

KEY RESULTS

In 2013, physicians sedated four times more patients continuously until death (6.7% in 2001; 24.5.5% in 2013). Four out of five sedated patients died in hospitals, outside specialized palliative care units, or in nursing homes. Sedation was more likely among patients younger than 65 (odds ratio 2.24, 95% CI 1.6 to 3.2) and those dying in specialized palliative care (OR 2.2, 95% CI 1.3 to 3.8) or in hospitals (1.7, 95% CI 1.3 to 2.3). Forgoing life-prolonging treatment with the explicit intention to hasten or not to postpone death combined with intensified alleviation of symptoms was very strongly associated with continuous deep sedation (OR 6.8, 95% CI 4.7 to 9.8).

CONCLUSIONS

In Swiss clinical practice, continuously deeply sedated patients predominantly died outside specialized palliative care. The increasing trend over time appears to be related to changes in medical end-of-life practice rather than to patient's clinical characteristics.

Palliative Sedation for Existential Suffering: A Systematic Review of Argument-Based Ethics Literature

CONTEXT

Although unanimity exists on using palliative sedation (PS) for controlling refractory physical suffering in end-of-life situations, using it for controlling refractory existential suffering (PS-ES) is controversial. Complicating the debate is that definitions and terminology for existential suffering are unclear, ambiguous, and imprecise, leading to a lack of consensus for clinical practice.

OBJECTIVES

To systematically identify, describe, analyze, and discuss ethical arguments and concepts underpinning the argument-based bioethics literature on PS-ES.

METHODS

We conducted a systematic search of the argument-based bioethics literature in PubMed, CINAHL, Embase^®, The Philosopher's Index, PsycINFO^®, PsycARTICLES^®, Scopus, ScienceDirect, Web of Science, Pascal-Francis, and Cairn. We included articles published in peer-reviewed journals till December 31, 2016, written in English or French, which focused on ethical arguments related to PS-ES. We used Peer Review of Electronic Search Strategies protocol, Preferred Reporting Items for Systematic Reviews and Meta-Analyses, and The Qualitative Analysis Guide of Leuven for data extraction and synthesis of themes.

RESULTS

We identified 18 articles that met the inclusion criteria. Our analysis revealed mind-body dualism, existential suffering, refractoriness, terminal condition, and imminent death as relevant concepts in the ethical debate on PS-ES. The ethical principles of double effect, proportionality, and the four principles of biomedical ethics were used in argumentations in the PS-ES debate.

CONCLUSION

There is a clear need to better define the terminology used in discussions of PS-ES and to ground ethical arguments in a more effective way. Anthropological presuppositions such as mind-body dualism underpin the debate and need to be more clearly elucidated using an interdisciplinary approach.

Experiences of Family Members of Dying Patients Receiving Palliative Sedation

PURPOSE/OBJECTIVES

To describe the experience of family members of patients receiving palliative sedation at the initiation of treatment and after the patient has died and to compare these experiences over time.
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DESIGN

Descriptive comparative study.
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SETTING

Oncology ward at Shaare Zedek Medical Center in Jerusalem, Israel.
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SAMPLE

A convenience sample of 34 family members of dying patients receiving palliative sedation. 
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METHODS

A modified version of a questionnaire describing experiences of family members with palliative sedation was administered during palliative sedation and one to four months after the patient died. Descriptive statistics were used to describe the results of the questionnaire, and appropriate statistical analyses were conducted for comparisons over time.
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MAIN RESEARCH VARIABLES

Experiences of family members and time.
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FINDINGS

Most relatives were satisfied with the sedation and staff support. Palliative sedation was experienced as an ethical way to relieve suffering. However, one-third felt that it shortened the patient's life. An explanation of the treatment was given less than half of the time and was usually given on the same day treatment was started. This explanation was given by physicians and nurses. Many felt that they were not ready for changes in the patient's condition and wanted increased opportunities to discuss the treatment with oncology care providers. No statistically significant differences in experiences were found over time. 
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CONCLUSIONS

Relatives' experiences of palliative sedation were generally positive and stable over time. Important experiences included timing of the initiation of sedation, timing and quality of explanations, and communication.
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IMPLICATIONS FOR NURSING

Nurses should attempt to initiate discussions of the possible role of sedation in the event of refractory symptoms and follow through with continued discussions. The management of refractory symptoms at the end of life, the role of sedation, and communication skills associated with decision making related to palliative sedation should be a part of the core nursing curriculum. Nursing administrators in areas that use palliative sedation should enforce good nursing clinical practice as recommended by international practice guidelines, such as those of the European Association for Palliative Care.

[Determining factors in the sedation of geriatric and oncology patients treated at home]

INTRODUCTION

Sedation, used as a therapeutic measure in the field of Palliative Care, continues to present difficulties for many professionals in its management and indications. Is varied existing literature in this regard, often exclusive cancer patients. Our objective is to analyse the characteristics of patients attended by a Home Care Support Team who required sedation compared to non-sedated patients, for possible determining factors for its use that could help in decision-making.

METHOD

A prospective analytical study conducted in Barbastro (Huesca) from September 2007 to February 2011. The study population are patients referred to the Home Care Support Team of Barbastro.

MAIN VARIABLES

Age, sex, medical history, symptoms, previous and current Barthel, Karnofsky, primary caregiver, previous drugs, drugs after intervention, sedation yes/no.

RESULTS

Required sedation 16.6% (n=106) of the cases (N=638). Sedated patients were younger, with no differences in sex, and the large majority (83%) were oncology patients. The presence of metastases showed no differences in need for sedation. Sedated patients have an increased functional impairment, determined by Barthel index decreased and a worse Karnofsky. Sedated patients showed increased frequency of uncontrolled symptoms, except psychomotor agitation, a fact determined by the medications used pre- and post-intervention.

CONCLUSIONS

The presence of neoplastic disease, marked with existence of functional decline, and uncontrolled clinical need for certain medications to control symptoms may determine the need for sedation at the end of the process, above other factors such as patient comorbidity.

Patient-Related Determinants of the Administration of Continuous Palliative Sedation in Hospices and Palliative Care Units: A Prospective, Multicenter, Observational Study

CONTEXT

Knowledge of determinants that are associated with the administration of continuous palliative sedation (CPS) helps physicians identify patients who are at risk of developing refractory symptoms, thereby enabling proactive care planning.

OBJECTIVES

This study aims to explore which patient-related factors at admission are associated with receiving CPS later in the terminal phase of life.

METHODS

A prospective multicenter observational study was performed in six Dutch hospices and three nursing home-based palliative care units. The association between patient-related variables at admission (age, gender, diagnosis, use of opioids or psycholeptics, number of medications, Karnofsky Performance Status scale score, Edmonton Symptom Assessment System distress score, and Glasgow Coma Scale score) and the administration of CPS at the end of life was analyzed.

RESULTS

A total of 467 patients died during the study period, of whom 130 received CPS. In univariate analysis, statistically significant differences were noted between the sedated and nonsedated patients with respect to younger age (P = 0.009), malignancy as a diagnosis (P = 0.05), higher Karnofsky Performance Status score (P = 0.03), the use of opioids (P < 0.001), the use of psycholeptics (P = 0.003), and higher Edmonton Symptom Assessment System distress score (P = 0.05). Multivariate logistic regression analysis showed that only the use of opioids at admission (odds ratio 1.90; 95% confidence interval 1.18-3.05) was significantly associated with the administration of CPS.

CONCLUSION

Physicians should be aware that patients who use opioids at admission have an increased risk for the administration of CPS at the end of life. In this group of patients, a comprehensive personalized care plan starting at admission is mandatory to try to prevent the development of refractory symptoms. Further research is recommended, to identify other determinants of the administration of CPS and to investigate which early interventions will be effective to prevent the need for CPS in patients at high risk.