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- W2023805714 abstract "Effects of moderate spontaneous hypothermia on left ventricular systolic and diastolic function during acute myocardial infarction were documented in 17 anesthetized dogs with micromanometric pressure and ventriculographic dimension recordings acquired at baseline and at 1 and 3 h after coronary occlusion. In Group 1 (n = 5), core temperature was allowed to decline spontaneously. In Groups 2 (n = 6) and 3 (n = 6), core temperature was maintained at normothermic levels. Hypothermia impaired isovolumic relaxation markedly despite its lack of effect on ventricular volumes or ejection fraction. At 32.3 degrees C, tau 1/2, defined as the time needed for the left ventricular pressure at the time of peak negative rate of change of left ventricular pressure (dP/dt) to fall by 50%, was increased by 129% 3 h after occlusion. In addition, at this temperature significant changes were found in heart rate, cardiac output, minute work, peak positive and peak negative dP/dt, systolic ejection time, mean velocity of circumferential fiber shortening, mean aortic pressure and end-diastolic pressure. Thus, hypothermia evolving under conditions of general anesthesia profoundly alters left ventricular function in the setting of acute myocardial infarction, a phenomenon that requires consideration and control in studies of myocardial ischemia and left ventricular function in experimental animals." @default.
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- W2023805714 date "1988-01-01" @default.
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- W2023805714 title "Sensitivity of isovolumic relaxation to hypothermia during myocardial infarction" @default.
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- W2023805714 doi "https://doi.org/10.1016/0735-1097(88)90190-8" @default.
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