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  • Title: Effects of inhalation anesthetics on cardiac function and metabolism in the intact dog.
    Author: Kumazawa T, Merin RG.
    Journal: Recent Adv Stud Cardiac Struct Metab; 1975; 10():71-9. PubMed ID: 1833.
    Abstract:
    In healthy, closed-chest dogs, dose-dependent depression of ventricular function was produced by the anesthetics halothane, methoxyflurane, and fluroxene, as evidence by decreases in left venticular stroke volume, stroke work, dP/dt, and an increased enddiastolic pressure. Myocardial blood flow and oxygen consumption decreased concomitantly and were correlated with aortic blood pressure decreases. There was no change in myocardial lactate extraction with halothane and methoxyflurane, suggesting that myocardial oxygenation was adequate in spite of the decrease in blood flow. However, even with marked increases in arterial lactate concentration during fluroxene anesthesia, extraction did not chance and, in fact, tended to decrease. The hemodynamic effects of halothane and methoxyflurane are similar to those previously reported in man, but those of fluroxene are different. Consequently, clinical speculation from these results is not justified at this time.
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