Abstract
Responses of systemic arterial perfusion pressure to changes in ventricular systolic pressure were determined before and after administration of dobutamine, then after propranolol, to determine whether the effective stimulus to left ventricular receptors was the change in ventricular systolic pressure or inotropic state. The results showed that increases in ventricular systolic pressure resulted in reflex vasodilatation which was unaffected by inotropic state, indicating that changes in ventricular systolic pressure provided the more potent stimulus.
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