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

By Peter L. Steponkus

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Serum enzymes that reflect the functional integrity of vital organs such as heart, liver, and brain were measured as indicators of general tissue preservation during the hypothermic whole-body perfusion technique. These data supplement the ultimate assay of life-supporting function demonstrated in these long-term surviving animals. , 1995). In general. Group I survivors showed only inconsequential and transient elevations in the measured enzymes compared with the marked and more persistent rises seen in the surviving dogs from Group II.

1974) to conclude that while 41 42 M J . M. E. BAILES improvements had been realized in their technique using Collins "intracellular" solution, 21/2 hours of circulatory arrest remained beyond the "safe time limits" of hypothermic cardiac arrest. In marked contrast, we demonstrate here that three hours of cardiac arrest is not beyond the safe limit when a procedure that maintains low-flow perfusion of an appropriate whole-body wash-out solution is employed. The tolerance to total circulatory arrest has not yet been tested in our model, but we contend that the necessity for absolute circulatory arrest is circumvented by using a bloodless system.

1990). The companion purge solution is a modified "extracellular-type" medium with a plasma-like ionic component that is typical of other established balance salt solutions such as Kreb's buffer and Ringer's lactate. For the reasons explained above, the present purge solution also contains the colloid dextran, HEPES buffer, adenosine and glutathione. Since the role of the purge solution in this hypothermic blood substitution technique is to remove blood from circulation during cooling and to flush out the hyperkalemic maintenance solution during warming, it is anticipated that additional benefits could be achieved by using this formulation as Hypothermic Protection During Bloodless Surgery a vehicle solution for pharmacological agents that would protect against membrane destabilization and reperfusion injury.

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