Brain Death Declaration Guidelines

Critical Waiting Period Before Initial Evaluation

The American Academy of Pediatrics recommends deferring brain death evaluation for 24 to 48 hours (or longer) following the initial injury, particularly after cardiopulmonary resuscitation or severe acute brain injury, to ensure the neurologic examination is reliable and not confounded by the acute resuscitation phase 1, 2
Assessment of neurologic function may be unreliable immediately following cardiopulmonary resuscitation or other severe acute brain injuries, and evaluation for brain death should be deferred for 24 to 48 hours or longer if there are concerns or inconsistencies in the examination 1, 2
The 24-48 hour deferral allows for clearance of sedative medications, resolution of metabolic derangements, and stabilization of hemodynamic parameters that could confound the clinical examination 1, 2

Core body temperature must be ≥35°C (95°F) before initiating brain death determination 3
Medications that can interfere with the neurologic examination must be discontinued with adequate clearance time based on elimination half-lives 1, 2
Blood or plasma levels should confirm that sedative anticonvulsants are in the low to mid-therapeutic range, not high or supratherapeutic levels 1, 2
The diagnosis of brain death based on neurologic examination alone should not be made if supratherapeutic or high therapeutic levels of sedative agents are present 1, 2

For Neonates (37 weeks gestation to 30 days of age), 24 hours between the first and second examination is recommended 1, 2, 3
For Infants and Children (>30 days to 18 years), 12 hours between the first and second examination is recommended 1, 2, 3

Ancillary studies (EEG or radionuclide cerebral blood flow) can be used to reduce the observation period between examinations when they support the diagnosis of brain death 1, 2
When an ancillary study is used to reduce the observation period, all aspects of the examination and apnea testing that can be safely completed should still be documented 1, 2
Bilateral absence of the N20 wave on short-latency SSEPs can predict death or vegetative state with 0% false positive rate as early as 8 hours from cardiac arrest 4, 5, 6

Failure to show neurological improvement within 72 hours from the start of treatment is a negative prognostic factor associated with poor functional outcome or death, but this is NOT the same as brain death 7
Brain death can be declared earlier than 72 hours if all clinical criteria are met after the mandatory 24-48 hour deferral period and appropriate observation intervals 1, 2

The time of death is recorded as the time of the second examination and apnea test (or completion of ancillary study and the components of the second examination that can be safely completed) 3