title: Depletion of myocardial creatine kinase, lactate dehydrogenase, myoglobin and K+ after coronary artery ligation in dogs.
abstract: In order to compare the time-course of disappearance of macromolecules and electrolytes from ischaemic myocardium, measurements of creatine kinase and lactate dehydrogenase activity and myoglobin, K+ and Na+ concentration were made on myocardial extracts from dogs which had left anterior descending coronary artery ligation for 3, 6, 12 and 24 h (4 groups of 6 dogs each). Intensity of ischaemia was assessed by myocardial blood flow measured with 15+/- 5 micrometers microspheres at 15 min after ligation. Creatine kinase and lactate dehydrogenase activities and K+/Na+ concentration ratios were at all times correlated with the magnitude of collateral blood flow in the ischaemic myocardium, while myoglobin concentration was correlated with blood flow only at 12 and 24h. Comparisons of the intensity of depletion at the various times after ligation showed that K+, K+/Na+ and creatine kinase had all reached a steady state at 12 h after ligation while lactate dehydrogenase and myoglobin had still to reach a steady state at 24 h. We conclude that these indices are mutually supportive markers of the intensity of ischaemia of 24 h duration, but K+ or K+/Na+ may be the most reliable indices for shorter periods of ischaemia of 3 to 6 h duration.
mesh_terms: D000818:Animals; D003326:Coronary Circulation; D003327:Coronary Disease / Q000201:enzymology / Q000378:metabolism* / Q000503:physiopathology; D003402:Creatine Kinase / Q000378:metabolism*; D004285:Dogs; D007770:L-Lactate Dehydrogenase / Q000378:metabolism*; D009206:Myocardium / Q000201:enzymology / Q000378:metabolism*; D009211:Myoglobin / Q000378:metabolism*; D011188:Potassium / Q000378:metabolism*; D012964:Sodium / Q000378:metabolism; D013997:Time Factors
chemical_list: D009211:Myoglobin; D012964:Sodium; D007770:L-Lactate Dehydrogenase; D003402:Creatine Kinase; D011188:Potassium