Persistent vegetative state |
A persistent vegetative state (or PVS) is a condition of patients with severe brain damage in whom coma has progressed to a state of "wakefulness without
awareness". The term was introduced by two doctors in 1972 to describe a syndrome that
seemed to have been made possible by medicine's increased capacities to keep
patients' bodies alive. A persistent vegetative state is not the same as coma, the major
distinction being that coma sufferers cannot breathe on their own.
Patients in a persistent vegetative state are usually considered to be unconscious and unaware, but exhibit sleep-wake cycles and some
behaviors that can be construed as arising from partial consciousness, such as grinding their teeth, swallowing, smiling,
shedding tears, grunting, moaning, or screaming without any apparent external stimulus. Their heads and eyes can track moving objects or turn towards a sound. Commonly, family members who visit the patient will detect evidence of awareness when doctors with limited
patient contact will deny it. Many people have recovered from PVS, and there is evidence that eye tracking is often the earliest
symptom of recovery.
As opposed to brain death, PVS is not recognized as death in any known legal system.
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