Summary
The influence of myocardial oxygen consumption (MVO2) at the moment of coronary occlusion on the size of the ensuing necrosis was investigated in 12 anaesthetised dogs. A two-infarction model was used with a sequential occlusion of two distant coronary branches in the same heart, however under different levels of MVO2. One group of occlusions was produced at a high MVO2 of 21.6±3.0 ml O2... min−1. 100 g−1. This group was compared with a second in which necrosis proceeded at a low MVO2 estimated to be 5.9±1.5 ml O2·min−1. 100 g−1 averaged over a 90-min occlusion period. Infarct size expressed as percentage of perfusion area was 43±28% in group 1 and 11±11% in group 2 (p<0.005). The mass of the perfusion area was equal in both groups (17±4 g, 19±6 g). The amount of myocardial necrosis, which after a 90-min occlusion depends on the acute collateral blood flow, was in every case greater under high MVO2. Thus a low MVO2 at the moment of occlusion can postpone myocardial necrosis.
Zusammenfassung
Der Einfluß des kardialen Sauerstoffverbrauchs (MVO2) auf die Infarktgröße wurde bei 12 narkotisierten Hunden untersucht. Zwei voneinander völlig getrennte Seitenäste der linken Koronararterie wurde nacheinander am selben Herzen verschlossen. Das erste Gefäßkollektiv wurde bei einem MVO2 von 21,6±3,0 ml ·min−1. 100 g−1 okkuldiert, das zweite bei einem MVO2 von 5,9±1,5ml·min−1 ·100g−1. Die Infarktgröße, ausgedrückt als Fraktion des Perfusionsgebietes, war 43±28% in Gruppe 1 und 11±11% in Gruppe 2 (p<0,005). Die Perfusionsgebiete, die okkludiert wurden, waren in beiden Gruppen gleich (17±4g, 19±6 g). Die Infarktgröße, die nach einer 90-min-Okklusion vom akuten Kollateralfluß abhängt, war in jedem Fall größer bei einem höheren MVO2. Somit kann ein, niedrigerer MVO2 zum Zeitpunkt des Verschlusses die Entwicklung der Nekrose zumindest hinauszögern.
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Müller, K.D., Sass, S., Gottwik, M.G. et al. Effect of myocardial oxygen consumption on infarct size in experimental coronary artery occlusion. Basic Res Cardiol 77, 170–181 (1982). https://doi.org/10.1007/BF01908170
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DOI: https://doi.org/10.1007/BF01908170