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Brainstem Death Testing — FRCA Final MCQ

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HardMedicolegal & EthicsBrainstem Death TestingFRCA Final

A 40-year-old man remains deeply comatose and apnoeic following a hanging. CT demonstrates diffuse hypoxic-ischaemic cerebral oedema with loss of grey–white differentiation. He is mechanically ventilated; core temperature, acid–base status, electrolytes and endocrine variables have been corrected, and sedative and neuromuscular-blocking drug effects have been excluded. Under current UK criteria for diagnosing and confirming death using neurological criteria, which statement describes a core prerequisite before clinical testing is undertaken?

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Correct answer: D — A known aetiology capable of causing irreversible brain injury must account for the coma

The correct answer is D. Before clinical testing, the coma must be attributable to an established cause capable of producing irreversible loss of brain function, and reversible confounders such as hypothermia, sedative or neuromuscular-blocking drugs, and major metabolic or endocrine abnormalities must be excluded. Diffuse hypoxic-ischaemic injury after hanging provides a plausible aetiology, but its permanence and adequacy to explain the clinical state must still be established. No universal 24-hour observation period is required. Spinal reflexes may persist because their pathways do not require brainstem function. Routine EEG confirmation is not part of the UK clinical criteria, although an approved ancillary investigation may be required when clinical testing cannot be completed or interpreted. Previous cardiac arrest is not itself a prerequisite.

Reference: Manara AR. Brain death: the United Kingdom perspective. Seminars in Neurology. 2015;35(2):125-133. https://pubmed.ncbi.nlm.nih.gov/25839723/