How do medial professionals decide treatment for a comatose person w/o family?

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Say someone (in the U.S.) without any family at all winds up at a hospital and goes comatose, needing to be on life support. Would they be on life support indefinitely or would anyone have the authority to ‘pull the plug’ so to speak? Sorry it’s kind of a dark question but these are the kinds of things keeping me up at night haha.

In: Biology