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Brain death--a review of the concept
1Neurology Service, Massachusetts General Hospital, Boston 02114.
Insights
Cardiac death has always been linked to brain death. Ventilator use can separate these, showing brain death is the true indicator of life cessation, not the heartbeat.
Area of Science:
- Neurology
- Medical Ethics
- Physiology
Background:
- The historical understanding of death traditionally centered on the cessation of heartbeat (cardiac death).
- Clinical practice has evolved, necessitating a clearer definition of death, particularly with advancements in life support technology.
Observation:
- Clinical experience demonstrates that cardiac death is invariably accompanied by brain death.
- The concept of cardiac death inherently includes the irreversible loss of brain function.
Findings:
- Ventilator support can artificially maintain heartbeat after brain death has occurred.
- This uncoupling reveals that brain death, not cardiac function, is the definitive marker of a person's death.
Implications:
- Revisiting the definition of death to prioritize brain death is crucial for medical and ethical clarity.
- This understanding impacts end-of-life care, organ donation protocols, and legal definitions of death.
Abstract:
The early origins of the concept of brain death have been retraced. Using practical examples from clinical experience it has been demonstrated that conventionally, cardiac death is always accompanied by brain death. Cardiac death implies brain death. The two are inseparably linked or coupled. Death on a ventilator uncouples the two, revealing death of the brain as the true determinant of the cessation of a person's life and the heartbeat as a false measure.