Effect of inotropic interventions on rate of change of ventricular diastolic dimensions

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Abstract
The effects of inotropic interventions upon the maximal rate of change of left ventricular (LV) wall thickness and internal diameter during early diastole were measured in 9 open-chest dogs by ultrasonic-dimension gauges. Isoproterenol increased the maximal rate of wall thickening during systole from 28 .+-. 3 to 48 .+-. 5 (SE) mm/s (P < 0.001); it had no effect on the maximal rate of wall thinning during early diastole, 40 .+-. 4 vs. 42 .+-. 4 mm/s [not significant (NS)]. Isoproterenol increased the maximal rate of reduction of the LV diameter during systole from 87 .+-. 6 to 125 .+-. 8 mm/s (P < 0.001); it had little effect on the maximal rate of increase of the diameter during early diastole, 79 .+-. 6 vs. 87 .+-. 4 mm/s (NS). Propranolol had a direct effect on the maximal rate of wall thickening and LV diameter reduction during systole, but had little or no effect on their counterparts during early diastole. Alterations of the contractile state evidently need not be accompanied by a concomitant effect on relaxation.

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