Advances in Low-Temperature Biology, Volume 3 by Peter L. Steponkus

By Peter L. Steponkus

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Showed that a 30% survival rate in dogs exposed to total asanguineous body perfusion at moderate hypothermia of 27 to 30°C for 30 minutes was possible (Neely, 1963). Only 5 of 33 animals survived long term without any complications. The animals that survived were exposed to only 20 minutes or less of asanguineous perfusion. Even though this was an attempt to understand the mechanism of mammalian reaction to total blood replacement, the results show that experimental conditions were suboptimal. Oxygenated solutions were used only in 3 of 33 animals, but even those three animals died of other causes.

The Case for Improved Outcome Using an ''Intracellular- Type'' Solution for UHBS The design of this Allegheny phase II study allows some conclusions to be drawn concerning the quality of whole-body protection during hypothermic perfusion with aqueous, blood-substitute solutions. The combined strategic use of an "extracellular-type" flush solution (HTS-P) and an "intracellular-type" maintenance solution (HTS-M) not only minimized biochemical and physiological disturbances during the acute phase of recovery, but also led to a more rapid return to normalcy with fewer neurological sequelae in the long-term survivors.

Three of the dogs recovered extremely rapidly and were able to stand, walk, and drink within 12 hours of the procedure. Hematology and biochemistry. A wide variety of hematological and biochemical parameters were assayed for evaluation of the extent and reversibility of disturbances to normal homeostasis imposed by complete exsanguination and ultraprofound hypothermia. Post-operative electrolyte levels were normal in all surviving dogs irrespective of experimental treatment. Disturbances to hematological parameters were modest and fully reversed.

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