The comparative cardiovascular effects of sevoflurane with halothane and isoflurane.
Using closed chest dogs, the cardiovascular effects of sevoflurane were compared with those of halothane and isoflurane in equipotent doses of 1.0, 1.5, 2.0, 2.5 and 3.0 MAC. They were evaluated by the changes of arterial blood pressure, central venous pressure, pulmonary artery pressure, maximum rate of left ventricular pressure rise (LV dp/dt), cardiac output and coronary sinus blood flow. The suppression of left cardiac function by sevoflurane was less than that of halothane, but was greater than that of isoflurane. Heart rate, systemic vascular resistance with sevoflurane were slightly lower than that of isoflurance. The coronary sinus blood flows with sevoflurane and isoflurane were significantly ( P < 0.05 at 1.0 MAC, P < 0.005 at 2.0 MAC) higher than halothane. There was no significant difference on coronary sinus flow between sevoflurane and isoflurane. The depth of anesthesia could be quickly changed by adjustment of inspired sevoflurane concentration in comparison with the other two anesthetics.
Kazama
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T
Research associate of Anesthesiology, Hamamatsu University Scholl of Medicine, Hamamatsu, Japan.
Ikeda
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K