Persistent Vegetative State
persistent vegetative state An extended state of unconsciousness in which higher BRAIN activity (cerebral cortex function) is negligible or lost though the brainstem continues to operate to sustain the vital functions of living such as breathing, HEART RATE, and BLOOD PRESSURE. Basic motor function, such as spontaneous though undirected movement, may also occur as the brainstem is responsible for some motor functions. The person may also make sounds, move the eyes, and move the MOUTH. However, there is no recognition of or purpose to these actions, and the person cannot follow instructions to move in certain ways and does not speak, drink, or eat.
A person may remain in a persistent vegetative state for months, years, or decades with adequate nutritional support. Though in general the longer a person remains in a persistent vegetative state the less likely he or she will recover conscious function, occasionally individuals emerge after extended periods. The likelihood of recovery depends on the extent and nature of damage to the cerebral cortex, which imaging procedures such as MAGNETIC RESONANCE IMAGING (MRI) and COMPUTED TOMOGRAPHY (CT) SCAN can help assess. Persistent vegetative state raises many medical, legal, and ethical concerns for health-care providers as well as family members in regard to how long to sustain life through supportive measures.
See also COMA; CONSCIOUSNESS; END OF LIFE CONCERNS; QUALITY OF LIFE.
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