P.050 Perspectives on the use of ancillary tests for determining neurological death: a survey of Canadian intensivists

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 regarding the use of ancillary tests. Results: Among 550 identified intensivists, 249 completed the survey. Respondents indicated they would be comfortable diagnosing death based on neurological examination without ancillary tests in the following scenarios: movement in response to stimulation (48%), spontaneous peripheral movement (31%), inability to evaluate upper/lower extremity responses (34%) or both oculocephalic and oculo-caloric reflexes (17%), presence of high cervical spinal cord injury (16%) and within 24 hours of hypoxemic-ischemic brain injury (15%). Furthermore, 93% agreed that ancillary tests should always be conducted when a complete neurological examination is impossible, 89% if there remains possibility of residual sedative effect and 59% in suspected isolated brainstem death. Conclusions: Our findings suggest that Canadian intensivists have different perceptions on what constitutes a complete and reliable clinical neurological examination for determining death by neurologic criteria. Some self-reported practices also diverge from national recommendations. Further investigation and education are required to align and standardize medical practice across physicians and systems.

Variability in Pediatric Brain Death Determination Protocols in the United States

Objective:To determine the variability in pediatric death by neurologic criteria (DNC) protocols between US pediatric institutions and compared to the 2011 DNC guidelines.Methods:Cross-sectional study of DNC protocols obtained from pediatric institutions in the United States (US) via regional organ procurement organizations. Protocols were evaluated across five domains: general DNC procedures, prerequisites, neurologic examination, apnea testing and ancillary testing. Descriptive statistics compared protocols to each other and the 2011 guidelines.Results:One hundred and thirty protocols were analyzed with 118 dated after publication of the 2011 guidelines. Of those 118 protocols, identification of a mechanism of irreversible brain injury was required in 97%, while 67% required an observation period after acute brain injury before DNC evaluation. Most protocols required guideline-based prerequisites such as exclusion of hypotension (94%), hypothermia (97%), and metabolic derangements (92%). On neurologic examination, 91% required a lack of responsiveness, 93% no response to noxious stimuli, and 99% loss of brainstem reflexes. 84% of protocols required the guideline-recommened two apnea tests. CO2 targets were consistent with guidelines in 64%. Contrary to guidelines, fifteen percent required ancillary testing for all patients and 15% permitted ancillary studies that are not validated in pediatrics.Conclusionsand Relevance: Variability exists between pediatric institutional DNC protocols in all domains of DNC determination, especially with respect to apnea and ancillary testing. Better alignment of DNC protocols with national guidelines may improve the consistency and accuracy of DNC determination.