X-Message-Number: 3692 Newsgroups: sci.cryonics From: (Michael Clive Price) Subject: Re: Cloning and Neurosuspension References: <3f4mrf$> Date: Sat, 14 Jan 1995 10:00:43 +0000 Message-ID: <> "Martin R. Olah" writes: >>- less perfused. For neuropatients the perfusion concentrates >> on the head, without being slowed down by having to perfuse >> the rest of the body. > > I am unaware of neuro suspensions providing a superior perfusion > to the brain. If so, I'd like to know more about it, especially > from someone who performs them both. I too will happily take a correction from an experienced neuro- and whole-body perfusionist, but until then it seems reasonable to me to suppose that one of the time-limiting factors in a suspension is the rate of throughput and loading of cryoprotectants and other perfusates. For a neurosuspension this has to be less of a problem because you tie off all the other arteries from the aorta. The perfusates go straight to the head. In addition I can see some tricky situations arising for the whole-body perfusionist. What happens if the head shows signs of a complete perfusion, but the body doesn't? (Something which is quite likely in practice, I think, given the arterial structures.) Does the perfusionist delay cool-down, trying for a better rest-of-body perfusion, and thus comprise the neurological preservation or start cool-down immediately, in which case the patient might as well have opted for neuro suspension in the first place. Michael Price Rate This Message: http://www.cryonet.org/cgi-bin/rate.cgi?msg=3692