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In more severe cases a coma may last for over five weeks, while some have lasted as long as several years. After this time, some patients gradually come out of the coma, some progress to a vegetative state, and others die. Some patients who have entered a vegetative state go on to regain a degree of awareness. Others remain in a vegetative state for years or even decades (the longest recorded period being 42 years). The outcome for coma and vegetative state depends on the cause, location, severity and extent of neurological damage.
A coma is a state of unconsciousness where a person is unresponsive and cannot be woken (file photo). In medically-induced comas, sedatives including and ketamine are used to sedate people, said Mr Colin Schieff, a neurosurgeon and trustee of brain injury charity Headway.