Summary
The present study was designed to clarify whether or not a difference between arterial and venous lactate (Δlactate) levels is useful for evaluation of mitochondrial function in ischemia-reperfused myocardium. In the first experiment, 12 dogs were divided into 2 groups: 10-min occlusion of the left anterior descending coronary artery (LAD) followed by 10-min reperfusion, or 30-min occlusion followed by 40-min reperfusion, were performed. The lactate levels in the femoral artery and the great cardiac vein were measured enzymatically. ΔLactate was reversed immediately after occlusion. Ten min and 20 min were required for the recovery of Δlactate in the 10-min-occlusion with 10-min-reperfusion, and 30-min-occlusion with 40-min-reperfusion groups, respectively. In the second experiment, 36 dogs were divided into 6 groups: 10-min occlusion of LAD; 10-min occlusion with 10-min reperfusion; 30-min occlusion; and 30-min occlusion with 10-, 20-, or 40-min reperfusion were performed. Mitochondria from normal and occluded or reperfused areas were prepared, and the respiratory function of the mitochondria was measured polarographically. No significant decreases in the mitochondrial function were observed in the 10-min-occlusion, and 10-min-occlusion with 10-min-reperfusion groups. On the other hand, respiratory function of mitochondria was impaired by 30-min occlusion and was not improved by 10- or 20-min reperfusion. Significant recovery in the mitochondrial function was observed after 40-min reperfusion. That is, differing recovery time courses between Δlactate and the mitochondrial function were observed.
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Hanaki, Y., Sugiyama, S., Taki, K. et al. Differing time courses between Δlactate and mitochondrial respiration during coronary occlusion and after reperfusion in canine hearts. Heart Vessels 4, 149–152 (1988). https://doi.org/10.1007/BF02058427
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DOI: https://doi.org/10.1007/BF02058427