In reply to jkarran:
I would not make any argument for life saving, but I don't have any conditions that could be made worse by carrying out treatment without seeing my medical records.
I do however live alone with a dog, which I would hate to starve to death whilst I was in a coma in hospital, or even dead.
I would also hate for my friends and family to think that I had just suddenly disappeared.
They do solve a problem, it is a problem that can be solved in other ways, but that applies to lots of things.