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Eliezer_Yudkowsky comments on Normal Cryonics - Less Wrong
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What has to be done ASAP is not vitrification it is cooling. Just dropping the body in a bath of icewater will prevent that kind of damage for days; and Suspended Animation or Alcor - either of which will be waiting right next to your bedside as fast as they can fly - have much more effective ways of cooling than a bath of icewater, and they're working on better ways yet. They also use a portable thumper to perform CPR while cooling (their special waterproof version has been patented by cryo orgs for marketing for other medical uses), just to make sure your blood stays oxygenated while you're in the metabolic danger zone, and I believe they pump you full of other protectants as well (using interosseous access, which is much faster than intravenous).
Local cryonics groups in faraway lands may not have thumpers and complicated blood medications and interosseous access, but they can at least dump you in a bathtub of ice water and perform CPR for a few minutes.
Also, with a bit more life insurance you can get the air ambulance option at Suspended Animation.
You are right - what I should be saying is not that I'm concerned about the likelihood of hours without vitrification but that I am concerned about hours of autolysis occurring.
Yes, well, I think it's safe to say that quite a few cryonics patients and orgs are concerned about that. There are complex technologies to prevent it, but also a simple one, widely available if you have any local cryonics group. It's called crushed ice, and a lot of stores will sell it to you.
What we need are studies of damage from vitrification when the operation was not done immediately after death, but after few hours as it usually happens.