LDH activity in hearts of Experimental Series 3. LDH activity was measured in the effluent perfusate during 30 min reperfusion. The perfusion protocol of Iso/Ade groups in this series of experiments was similar to that of Iso/Ade-0 group in the Experimental Series 1. LDH activity is presented for Control and Iso/Ade groups in sham-operated hearts (SO, n = 6 in each group) and failing hearts after the left descending coronary artery ligation (CAL, n = 5 in control and n = 6 in Iso/Ade group). * P < 0.05 vs. corresponding Control (either SO or CAL); # P < 0.05 vs. Control CAL.