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Heart Institute, Good Samaritan Hospital, and Cardiovascular Division, University of Southern California, Los Angeles, California 90017-2395
Two independent cardioprotective interventions, Na+/H+ exchange inhibition and ischemic preconditioning (PC), were investigated with respect to differential effects on microvascular and myocardial salvage in anesthetized rabbits (30 min of ischemia, 180 min of reperfusion). Cariporide (Car, 300 µg/kg) administered before occlusion and PC reduced infarct size (IS) as measured by triphenyltetrazolium staining [control, 46.0 ± 4.2% of risk area (RA); Car, 17.6 ± 3.7% (P < 0.01); PC, 27.5 ± 4.1% (P < 0.01)] and concomitantly decreased the area of anatomic no reflow (ANR) as measured by thioflavin S staining [control, 40.4 ± 3.7%; Car, 19.0 ± 2.9% (P < 0.01); PC, 26.9 ± 3.4% (P < 0.05)]. Regional myocardial blood flow (RMBF, measured by radioactive microspheres) in the RA, which deteriorated between 30 and 180 min of reperfusion (control, from 79 ± 6 to 26 ± 2% of nonischemic flow), was shifted to higher values with both treatments [Car, from 110 ± 12 to 49 ± 7% (P < 0.05); PC, from 109 ± 8 to 38 ± 6% (P < 0.05)]. However, neither intervention uncoupled the close relationship between IS and ANR (r = 0.92-0.95) or RMBF. Car given at reperfusion did not alter IS, ANR, RMBF, or the close interrelationships. Because size and spatial distribution of no reflow and myocardial necrosis remained closely coupled with independent cardioprotective interventions, a potential causal connection between microvascular and myocardial salvage is discussed.
infarction; microvasculature; regional blood flow
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