Tough question, I don't know how I'd handle the situation but I wouldn't want others making the decision for me. Here's a recent case.
Quote:
 Unlocked: man in coma can 'speak'
November 14 2012 at 03:30pm
By SOPHIE BORLAND
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 youtube.com
Scott Routley and his parents in a YouTube screenshot.
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London - A patient believed to have been in a vegetative state for more than a decade has been able to communicate using the power of thought.
Scott Routley, from Ontario, Canada, was left severely brain damaged after a car crash. He has managed to tell his doctors he is not in any pain.
He is one of several such patients being treated using a pioneering technique developed by researchers at Cambridge University.
Scott’s case marks the first time a patient said to be in a permanent vegetative state has been able to answer questions relating to his care – suggesting he is aware of his condition.
It also means he can communicate in a way that could help doctors improve his quality of life.
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http://www.iol.co.za/lifestyle/unloc...peak-1.1423194