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Brain death and persistent vegetative states.

Clinics in Geriatric Medicine

|August 1, 1986

Summary

This summary is machine-generated.

Brain death is confirmed by absent brainstem reflexes and apnea, even with mechanical ventilation. Patients in a persistent vegetative state have lost higher brain function but retain brainstem function, with no hope of recovery.

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Area of Science:

Neurology
Critical Care Medicine

Background:

Severe brain damage can lead to brain death, a state where the brain ceases to function despite mechanical ventilation.
Established criteria in the UK and US define brain death based on specific clinical findings.

Observation:

Brain death diagnosis requires exclusion of confounding factors like drug intoxication, hypothermia, or metabolic coma.
Apneic coma with irreversible cause, absent brainstem reflexes, and apnea at PaCO2 ≥ 50 mm Hg confirm brain death.

Findings:

Brain death signifies the irreversible cessation of all brain functions, including the brainstem.
The persistent vegetative state involves loss of higher cortical function but preserved brainstem function, with no prognosis for recovery.

Implications:

Keywords:

Death and Euthanasia

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Declaration of brain death necessitates cessation of mechanical ventilation and signifies legal death.
For patients in a persistent vegetative state, ethical considerations shift towards basic nursing care and maintaining dignity due to the absence of recovery prognosis.