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• W2467504129 abstract "Neonatal and adult myocardium respond differently to ischemia. In addition, the neonatal heart possesses a limited preload reserve. The effect of uninterrupted hypothermic ischemia on recovery of left ventricular function and preload reserve was studied in two groups of isolated rabbit hearts: group 1 (neonates, n = 8), 7 to 10 days old; group 2 (adults, n = 15), 6 to 12 months old. Peak left ventricular systolic pressure, the first derivative of left ventricular systolic pressure, and heart rate were measured at left ventricular pressures of 0, 5, 10, and 15 mm Hg before and after 120 minutes of global ischemia at 27 degrees C. Before ischemia, left ventricular systolic pressure increased significantly at each increment of left ventricular end-diastolic pressure for both groups of hearts. After hypothermic ischemia, recovery of left ventricular systolic pressure was significantly reduced at each level of left ventricular end-diastolic pressure among neonatal hearts (range 75% to 79% of control values). The postischemic recovery of left ventricular systolic pressure in the adult hearts was markedly reduced from baseline values (range 43% to 53% of control values) and was significantly worse than that of neonatal hearts at each level of left ventricular end-diastolic pressure (p less than 0.001). Both groups were able to respond to increasing preload after ischemia. The slope of the curve describing the relationship between left ventricular end-diastolic pressure and percent recovery of left ventricular systolic pressure was not different from zero for neonatal hearts but was significantly greater than zero among the adults (0.22 +/- 0.21 versus 0.73 +/- 0.07, p = 0.0056). After ischemia, the first derivative of left ventricular systolic pressure fell significantly from control values among neonatal hearts (71% of control values). The reduction was considerably greater, however, among the adult hearts (54% of control values). These data indicate that the neonatal heart recovers systolic function better than the adult heart after global ischemia with moderate hypothermia." @default.
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• W2467504129 date "1988-05-01" @default.
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• W2467504129 title "The effect of hypothermic ischemia on recovery of left ventricular function and preload reserve in the neonatal heart" @default.
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• W2467504129 doi "https://doi.org/10.1016/s0022-5223(19)35691-0" @default.
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