Even if the patient is not terminally ill or permanently unconscious, it is not unethical to discontinue all means of life-sustaining medical treatment in accordance with a proper substituted judgment or best interests analysis. (I, III, IV, V)
http://www.freerepublic.com/focus/f-backroom/1428208/posts
Frankly, neither you nor I should ever trust the ethics or attention to medical detail of any physician. They can be very dangerous.