Artificial Nutrition and Hydration
The most common question when these situations arise is whether to provide the person with food and water. If the person will quickly die without artificial means to maintain heart or lung function, then providing food and water will not be an issue. However, this may become important if the person is not likely to die or not likely to die soon.
Most people want to be as comfortable as possible, even if they want to be allowed to die. Withholding food or water can cause additional pain. Some people are willing to accept this pain in order to hasten death (and overall relief). Others would rather live a little longer if it means avoiding pain.