I suspect that there are a variety of complications(both in terms of what you can actually get honored in a given jurisdiction; and conceptual ones that people either smarter or more empirical than I am have become aware of); but my understanding that that that’s more or less what advance directives are intended to handle: allow people to articulate their preferences for when they can no longer articulate their preferences while it is still possible to do so. Not much to be done if you don’t have them set up prior to needing them, and probably enough ambiguity and matters of degree to keep team medical ethics employed; but certainly better than having nothing to go on.
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