X-Message-Number: 33148
References: <>
From: Gerald Monroe <>
Date: Mon, 27 Dec 2010 12:42:20 -0600
Subject: Re: CryoNet #33139 - #33144

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Simplifying it : the edema damages neurons enough that they won't restart.
 (nor will a flooded engine, or a jammed machine).  But since biological
enzymes aren't functional near 0 degrees C, neurons have probably not been
able to catalyze the self destructive processes that neurons perform when
they think they are damaged beyond repair.  Hence, if a patient were stored
at near 0 C for 24 hours, there's still a reasonable chance that their brain
contains the information that cryonics tries to preserve.  But it isn't
ideal : ideal cryonics preservation freezes the brain before an hour of cold
ischemia has occurred (before that point CPR and bypass machines are used to
actively prevent ischemia).  The reason this is ideal is that the maximum
chance of survival according to current science would be to put the brain in
state at low temperature that we know is revivable, and then to freeze it
preventing any further biochemical change at all from that start.  Since the
brain is composed of complex molecular structures, even though we cannot
prove for certain that revival is possible, we can show that it is virtually
certain that the information needed to perform a revival has been preserved.

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