Sam D Shemie

• BSc Physiology, MD
• Managing Director at McGill University

Background Cardiac arrest often leads to mortality or neurological impairment. We have limited expertise in using noninvasive brain neuromonitoring to guide brain‐based resuscitation targets in CPR or as a biomarker to anticipate cardiac arrest. Case Summary 13‐day‐old neonate with severe hypoplastic right heart syndrome underwent aortopulmonary s...

On November 9 and 10, 2023, the Organización Nacional de Trasplantes (ONT), under the Spanish Presidency of the Council of the European Union, convened in Santander a Global Summit entitled “Towards Global Convergence in Transplantation: Sufficiency, Transparency and Oversight.” This article summarizes two distinct but related challenges elaborated...

Background: The identification and referral (ID&R) of potential organ donors to provincial organ donation organizations (ODOs) is a critical first step in the organ donation process. However, even in provinces with mandatory referral legislation, there remains variability in ID&R rates across critical care units, with some units demonstrating high...

Normothermic regional perfusion (NRP) is a surgical technique that can improve the quality and number of organs recovered for donation after the determination of death by circulatory criteria. Despite its promise, adoption of NRP has been hindered because of unresolved ethical issues. To inform stakeholders, this scoping review provides an impartia...

In controlled organ donation after circulatory determination of death (cDCDD), accurate and timely death determination is critical, yet knowledge gaps persist. Further research to improve the science of defining and determining death by circulatory criteria is therefore warranted. In a workshop sponsored by the National Heart, Lung, and Blood Insti...

Insufficient evidence-based recommendations to guide care for patients with devastating brain injuries (DBIs) leave patients vulnerable to inconsistent practice at the emergency department (ED) and intensive care unit (ICU) interface. We sought to characterize the beliefs of Canadian emergency medicine (EM) and critical care medicine (CCM) physicia...

Introduction: Limited data exists on the trends of cerebral (CSat) and renal (RSat) saturations measured by near infrared spectroscopy (NIRS) of neonates with a congenital heart defect (CHD) during the first days of life in the pre-interventional setting. Hypothesis: We hypothesized that retrograde aortic flow in aorta as an indicator of diastolic...

We sought to collate and summarize existing literature on donor audits (DA) and how they have been used to guide deceased organ donation and transplantation system performance and quality assurance. We searched MEDLINE, Cumulative Index of Nursing and Allied Health Literature, and Web of Science supplemented by Google to identify grey literature on...

Deceased donor audits (DAs) allow organ donation and transplantation systems to measure and analyze missed donation opportunities (MDOs). Missed donation opportunities can harm both patients/families denied the opportunity to donate and patients on transplant waitlists denied access to lifesaving organs. In Canada, there are no national standards f...

Résumé Contexte Depuis la parution du document d’orientation de 2019 de la Société canadienne du sang (SCS) pour les dons d’organes et de tissus après décès dans le cadre de l’aide médicale à mourir (AMM), le gouvernement fédéral a apporté des amendements à sa loi sur l’AMM. La présente mise à jour s’adresse aux médecins, aux organismes de don d’o...

Objective: To investigate whether observable differences exist between patterns of withdrawal of life-sustaining measures (WLSM) for patients eligible for donation after circulatory death (DCD) in whom donation was attempted compared with those patients in whom no donation attempts were made. Setting: Adult intensive care units from 20 centres in C...

Background: Since Canadian Blood Services (CBS) developed policy guidance in 2019 for organ and tissue donation after medical assistance in dying (MAiD), the federal government has made changes to legislation related to MAiD. This document provides updated guidance for clinicians, organ donation organizations, end-of-life care experts, MAiD provid...

Unlabelled: Health systems must collect equity-relevant sociodemographic variables to measure and mitigate health inequities. The specific variables collected by organ donation organizations (ODOs) across Canada, variable definitions, and processes of the collection are not defined. We undertook a national health information survey of all ODOs in...

Organ donation after euthanasia is performed in Belgium, the Netherlands, Canada and Spain. Directed deceased organ donation is currently possible under strict conditions in a limited number of countries, while it is currently not possible to opt for directed donation following euthanasia. While organ donation after euthanasia is a deceased donatio...

Purpose: Ancillary tests are frequently used in death determination by neurologic criteria (DNC), particularly when the clinical neurologic examination is unreliable. Nevertheless, their diagnostic accuracy has not been extensively studied. Our objective was to synthesize the sensitivity and specificity of commonly used ancillary tests for DNC. S...

There are two anatomic formulations of death by neurologic criteria accepted worldwide: whole-brain death and brainstem death. As part of the Canadian Death Definition and Determination Project, we convened an expert working group and performed a narrative review of the literature. Infratentorial brain injury (IBI) with an unconfounded clinical ass...

PurposeWe aimed to describe the Canadian public’s understanding and perception of how death is determined in Canada, their level of interest in learning about death and death determination, and their preferred strategies for informing the public.Methods We conducted a nationwide cross-sectional survey of a representative sample of the Canadian publ...

PurposeDecompressive craniectomy immediately reduces intracranial pressure by increasing space to accommodate brain volumes. Any delay in reduction of pressure and signs of severe intracranial hypertension requires explanation.Clinical FeaturesWe present the case of a 13-yr-old boy presenting with a ruptured arteriovenous malformation resulting in...

This 2023 Clinical Practice Guideline provides the biomedical definition of death based on permanent cessation of brain function that applies to all persons, as well as recommendations for death determination by circulatory criteria for potential organ donors and death determination by neurologic criteria for all mechanically ventilated patients re...

PurposeThe term “brainstem death” is ambiguous; it can be used to refer either exclusively to loss of function of the brainstem or loss of function of the whole brain. We aimed to establish the term’s intended meaning in national protocols for the determination of brain death/death by neurologic criteria (BD/DNC) from around the world.Methods Of 78...

PurposeCurrently, there is little empirical data on family understanding about brain death and death determination. The purpose of this study was to describe family members’ (FMs’) understanding of brain death and the process of determining death in the context of organ donation in Canadian intensive care units (ICUs).Methods We conducted a qualita...

Clarity regarding the biomedical definition of death and the criteria for its determination is critical to inform practices in clinical care, medical research, law, and organ donation. While best practices for death determination by neurologic criteria and circulatory criteria were previously outlined in Canadian medical guidelines, several issues...

Unlabelled: Organ and tissue donation and transplantation (OTDT) legislation and policies vary around the world, and this variability contributes to discrepancies in system performance. This article describes the purpose and methodology of an international forum that was organized to create consensus recommendations related to key legal and policy...

Introduction In donation after circulatory determination of death, death is declared 5 min after circulatory arrest. This practice assumes, but does not explicitly confirm, permanent loss of brain activity. While this assumption is rooted a strong physiological rationale, paucity of direct human data regarding temporal relationship between cessatio...

PurposeDeceased organ donation is predicated on timely identification and referral (IDR) of potential organ donors. Many Canadian provinces have legislated mandatory referral of potential deceased donors. Untimely or missed IDRs are safety events where best or expected practice has not occurred causing preventable harm to patients and denying famil...

Objectives: To compare trends in the anterior cerebral artery (ACA) Doppler markers of vascular flow for neonates with a congenital heart defect (CHD) with and without diastolic systemic steal during the first 7 days of life. Methods: Prospective study recruiting newborns (≥35 weeks gestation) with a CHD. Doppler ultrasound and echocardiography...

Sexual orientation and gender identity (SOGI) diverse populations experience discrimination in organ and tissue donation and transplantation (OTDT) systems globally. We assembled a multidisciplinary group of clinical experts as well as SOGI-diverse patient and public partners and conducted a scoping review including citations on the experiences of...

Procedural aspects of compassionate care such as the terminal extubation are understudied. We used machine learning methods to determine factors associated with the decision to extubate the critically ill patient at the end of life, and whether the terminal extubation shortens the dying process. We performed a secondary data analysis of a large, pr...

Debates and criticism surrounding death by neurologic criteria feed on knowledge gaps and unanswered questions. Performance of high-quality research is necessary to advance the scientific basis for practice while acknowledging that metaphysical and spiritual concerns are not answerable by scientific inquiry. Prospective research in patients with de...

Background and objectives: There is a paucity of data on the frequency and prognosis of infratentorial brain injury among patients suspected of death by neurologic criteria (DNC), which likely contributes to scientific uncertainty regarding the role of isolated brainstem death in DNC determination. Our aim was to synthesize the prevalence, charact...

Introduction The process of controlled organ donation after circulatory determination of death (cDCDD) results in ischaemic injury to organs and leads to poorer outcomes in organ recipients. Although not yet used in Canada, normothermic regional perfusion (NRP) is a perfusion technology used postmortem with cDCDD donors to selectively restore perfu...

Background: Decisions about organ donation are stressful for family members of potential organ donors. We sought to comprehensively explore the donation process from interviews conducted with family members of patients admitted to pediatric and adult intensive care units in Canada. Methods: We conducted a qualitative study using semistructured,...

Establishing when cerebral cortical activity stops relative to circulatory arrest during the dying process will enhance trust in donation after circulatory determination of death. We used continuous electroencephalography and arterial blood pressure monitoring prior to withdrawal of life sustaining measures and for 30 minutes following circulatory...

Background: Advances in medicine and technology that have made it possible to support, repair, or replace failing organs challenge commonly held notions of life and death. The objective of this review is to develop a comprehensive description of the current understandings of the public regarding the meaning/definition and determination of death....

Background. During the 1950s, advances in critical care, and organ transplantation altered the relationship between organ failure and death. There has since been a shift away from traditional cardiocirculatory based to brain-based criteria of death, with resulting academic controversy, despite the practice being largely accepted worldwide. Our obje...

Introduction: Ancillary tests are widely used to diagnose death by neurological criteria (DNC), particularly in patients with unreliable or incomplete clinical examinations1-3. Despite their importance in DNC determination, ancillary test use in clinical practice is heterogeneous and their respective diagnostic accuracy is unclear. Objective: To s...

Purpose: Trust in the deceased organ donation process relies on the expectation that the diagnosis of death by neurologic criteria (DNC) is accurate and reliable. The objective of this study was to assess the perceptions and approaches to DNC diagnosis among Canadian intensivists. Methods: We conducted a self-administered, online, cross-sectiona...

Background: Ancillary tests are indicated to diagnose death by neurological criteria whenever clinical neurological examination is unreliable, but their use is variable and subject to debate. Methods: Survey of Canadian intensivists providing care for potential organ donors. We included closed-ended questions and different clinical scenarios regard...

Background: CT-angiography is an ancillary test used to diagnose death by neurological criteria (DNC), notably in cases of unreliable neurological examinations due to clinical confounders. We studied whether clinical confounders to the neurological examination modified CT-angiography diagnostic accuracy. Methods: Systematic review and meta-analysis...

Donation after circulatory determination of death has increased the number of organs available but can result in worse recipient outcomes than organs recovered from donors after neurologic death. Normothermic regional perfusion is a novel tool that can circumvent the shortcomings of donation after circulatory determination of death. However, its im...

A decision to withdraw life-sustaining treatment (WLST) is derived by a conclusion that further treatment will not enable a patient to survive or will not produce a functional outcome with acceptable quality of life that the patient and the treating team regard as beneficial. Although many hospitalized patients die under such circumstances, control...

Objective There is currently no existing data examining the opinions of patients and families after treatment with extracorporeal cardiopulmonary resuscitation (ECPR) for out-of-hospital cardiac arrest (OHCA). We sought to interview family members and patients to learn from their experiences and satisfaction with treatment. Methods We contacted fa...

Objective: To evaluate the sensitivity of ancillary testing in patients with death by neurological criteria (DNC). Background: Ancillary tests are used to support the diagnosis of DNC when required by legislation, or when the clinical examination is inconclusive or confounded. Despite widespread use, their diagnostic accuracy is currently unclear....

There are varying medical, legal, social, religious and philosophical perspectives about the distinction between life and death. Death can be declared using cardiopulmonary or neurologic criteria throughout much of the world. After solicitation of brain death/death by neurologic criteria (BD/DNC) protocols from contacts around the world, we found t...

A decision to withdraw life-sustaining treatment (WLST) is derived by a conclusion that further treatment will not enable a patient to survive or will not produce a functional outcome with acceptable quality of life that the patient and the treating team regard as beneficial. Although many hospitalized patients die under such circumstances, control...

Background While most overdose deaths in Canada occur in the community, some patients are resuscitated, admitted to intensive care units having sustained severe anoxic brain injury, and have the potential to be organ donors. The purpose of this study was to determine the impact of the overdose crisis on organ donation in selected Canadian provinces...

Controlled donation after circulatory determination of death (DCD), where death is determined after cardiac arrest, has been responsible for the largest quantitative increase in Canadian organ donation and transplants, but not for heart transplants. Innovative international advances in DCD heart transplantation include direct procurement and perfus...

Background The minimum duration of pulselessness required before organ donation after circulatory determination of death has not been well studied. Methods We conducted a prospective observational study of the incidence and timing of resumption of cardiac electrical and pulsatile activity in adults who died after planned withdrawal of life-sustain...

Background: Extracorporeal membrane oxygenation (ECMO) is used to provide temporary cardiorespiratory support to critically ill children. While short-term outcomes and costs have been evaluated in this population, less is known regarding long-term survival and costs. Methods: Population-based cohort study from Ontario, Canada (October 1, 2009 to...

PurposeNeurologic determination of death (NDD) is legally accepted as death in Canada but remains susceptible to misunderstandings. In some cases, families request continued organ support after NDD. Conflicts can escalate to formal legal challenges, causing emotional, financial, and moral distress for all involved. We describe prevalence, character...

Background: The COVID-19 pandemic has disrupted all aspects of the international organ donation and transplantation (ODT) system. Multiple organizations have developed guidance, but to date, no comparative summary has emerged to understand differences in existing recommendations. Methods: We developed and applied a comparative methodology to a conv...

Background Extracorporeal cardiopulmonary resuscitation (ECPR) is a therapeutic option for refractory cardiac arrest. We sought to perform an environmental scan to describe ECPR utilization in Canada and perceived barriers for application to out-of-hospital cardiac arrest (OHCA). Methods This was a national cross-sectional study. We identified all...

The ESM was updated in the original article to replace an incorrect version that was published with tracked changes notes.

Purpose: Heart donation and transplantation following circulatory determination of death has yet to be performed in Canada. A consensus forum was held to provide expert guidance to inform policy with a comprehensive patient partner strategy. This paper describes the process used to create fulsome patient partner engagement resulting in mutually be...

Background: Donation after circulatory determination of death (DCD) is responsible for the largest increase in deceased donation over the past decade. When the Canadian DCD guideline was published in 2006, it included recommendations to create standard policies and procedures for withdrawal of life-sustaining measures (WLSM) as well as quality ass...

Importance There are inconsistencies in concept, criteria, practice, and documentation of brain death/death by neurologic criteria (BD/DNC) both internationally and within countries. Objective To formulate a consensus statement of recommendations on determination of BD/DNC based on review of the literature and expert opinion of a large multidiscip...

PurposeWe surveyed Canadian critical care physicians who may care for patients who are potential organ donors to understand their attitudes and knowledge of legislation governing the deceased organ donation system.Methods We used a web-based, self-administered survey that included questions related to opt-out consent and mandatory referral legislat...

Objective We sought to identify similarities and differences in the diagnostic requirements for ancillary testing for determination of brain death/death by neurologic criteria (BD/DNC) around the world.Methods We reviewed diagnostic requirements for ancillary testing for BD/DNC in 78 unique official national BD/DNC protocols obtained from contacts...

Background and purpose: We sought to 1) identify countries in Asia and the Pacific that have protocols for the determination of brain death/death by neurologic criteria (BD/DNC) and 2) review the similarities and differences of these protocols in different countries. Methods: Between January 2018 and April 2019, we attempted to communicate with...

Objective To identify similarities and differences in protocols on determination of brain death/death by neurologic criteria (BD/DNC) around the world. Methods We collected and reviewed official national BD/DNC protocols from contacts around the world between January 2018 and April 2019. Results We communicated with contacts in 136 countries and...

The primary purpose of this statement is to improve neuroprognostication after devastating brain injury (DBI), with a secondary benefit of potential organ and tissue donation.

Introduction In a patient-centred and family-centred approach to organ donation, compassion is paramount. Recent guidelines have called for more research, interventions and approaches aimed at improving and supporting the families of critically ill patients. The objective of this study is to help translate patient-centred and family-centred care in...

Objectives We sought to (1) identify the countries in the Latin America/Caribbean Group of the United Nations (GRULAC) that have protocols for brain death/death by neurologic criteria (BD/DNC) and (2) review the similarities and differences between these protocols. Materials and Methods Between January 2018 and April 2019, we obtained and reviewed...

There is international variability in the determination of death. Death in donation after circulatory death (DCD) can be defined by the permanent cessation of brain circulation. Post‐mortem interventions that restore brain perfusion should be prohibited as they invalidate the diagnosis of death. Retrieval teams should develop protocols that ensure...

Purpose Cardiac transplantation is a definitive therapy for end-stage heart failure, but demand exceeds supply. Cardiac donation after circulatory determination of death (cardiac DCDD) can be performed using direct procurement and perfusion (DPP), where cardiac activity is restored after heart recovery, or (NRP), where brain blood supply is surgica...

Purpose: The number of patients on cardiac transplant waitlists exceeds the number of available donor organs. Cardiac donation is currently limited to those declared dead by neurologic criteria in all but three countries. Cardiac donation after circulatory determination of death (cardiac DCDD) can be conducted using direct procurement and perfusio...

Despite the fact that brain death guidelines are used around the world to declare death by neurologic criteria, their validity has been called into question in a number of recent lawsuits. Do the guidelines for brain death determination need to be revised? Guidelines for death determination consistently define brain death as the complete and irreve...

Introduction In Canada, deceased organ donation provides over 80% of transplanted organs. At the time of death, families, friends or others assume responsibility as substitute decision-makers (SDMs) to consent to organ donation. Despite their central role in this process, little is known about what barriers, enablers and beliefs influence decision-...

Purpose Intensive care physicians play an important role in the identification and referral of potential organ donors in Canada. Nevertheless, little is known about intensivists’ attitudes or behaviours in situations where families override previously expressed consent to donate; nor why physicians elect not to refer patients who are potential dono...