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“persistent vegetative coma”
persistent vegetative state, persistent vegetative coma (s) (noun); persistent vegetative states, persistent vegetative comas (pl)
A type of coma in which the patient shows alternating sleep and wake cycles: "As a result of a severe damage to certain areas of the brain, the person is unconscious when he or she is in the persistent vegetative coma, even when that patient appears to be awake."