Chart showing causes of coma. This is very important to all of you fiction writers out there.
Before his treatment, the patient had been in a persistent vegetative state for nine weeks due to having a heart attack
persistent vegetative state : Photo
One third of patients in 'vegetative' states show signs of consciousness | The Verge
persistent vegetative state
Information regarding coma and vegetative state when a person has the ability to be awake yet is completely unaware of their surroundings.
The Brain Injury Group.B.I.G. is a support group for people who have loved ones with devastating brain injuries. They may be severely disabled, in a persistent vegetative state, minimally aware/conscious or locked in.