Abstract:I . An online analogue computer was used to measure myocardial contractility as the ratio -where dP/dt is maximum rate of change of left ventricular pressure and IIT is integrated isometric tension. dP/dt IIT 2. In the open thorax anaesthetized dog, max (dP/dt) and dP/dt -were compared during alterations in preload, by partial vena caval occlusion, and changes in afterload obtained by acetylcholine injections and by partial occlusion of the descending thoracic aorta.3. A fall in preload lowered max (dP/dt) but… Show more
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