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Science 3 September 1976:
Vol. 193. no. 4256, pp. 909 - 910
DOI: 10.1126/science.181843
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Articles

Science, Vol 193, Issue 4256, 909-910
Copyright © 1976 by American Association for the Advancement of Science

articles

Ischemic areas in perfused rat hearts: measurement by NADH fluorescence photography

CH Barlow and B Chance

Fluorescence emission of reduced nicotinamide adenine dinucleotide (NADH) from the surface of perfused rat hearts was photographed to provide a two-dimensional recording of NADH levels. Sodium Amytal inhibition of NADH oxidation resulted in a homogeneous increase in NADH fluorescence, while lowering perfusion pressure from 55 to 10 torr caused a heterogeneous increase in NADH fluorescence, reflecting the heterogeneous oxygen delivery at this low pressure. Local ischemia resulted in a well-defined region of high NADH fluorescence that corresponded to the region of ischemic inslut. The sharp transition between the ischemic and normoxic areas demonstrated that the hypoxic interface separating the two areas must be quite small.


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