In medicine, a coma (from the Greek koma, meaning deep sleep) is a deep state of unconsciousness.
A patient suffering from a coma cannot be awakened, does not respond normally to pain or light, fails to have sleep-wake cycles, and does not take voluntary actions. Coma can result from a variety of conditions, including intoxication, metabolic abnormalities, central nervous system diseases, acute neurologic injuries such as stroke, and hypoxia.
Phases Learn the distinctive phases a coma patient may undergo
Know the levels of severity associated with different coma phases
Outcome Different outcomes for comas - Find out more about recovery & treatment
What happens next? A coma patient's outcome depends on their case
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