Fig. 1. Representative example of the effects of leg elevation on left ventricular pressure (LVP), dP/dtmax, and LVP − dP/dt tracing before and after cardiopulmonary bypass (CPB). Each panel shows two superposed tracing, comparing the baseline condition (solid lines) to the condition at the end of leg elevation (dashed lines). Leg elevation resulted in a variable
Fig. 1. Representative example of the effects of leg elevation on left ventricular pressure (LVP), dP/dtmax, and LVP − dP/dt tracings before and after cardiopulmonary bypass (CPB). Each panel shows two superposed tracings, comparing the baseline condition (solid lines) to the condition at the end of leg elevation (dashed lines). Leg elevation resulted in a variable response of LV function among patients. In the left panel, leg elevation resulted in an improved LV function with an increase in dP/dtmaxand an acceleration of LV pressure fall. This acceleration is apparent from the LVP − dP/dt tracings at the lower panels of the figure. On such a plot, the cardiac cycle is read clockwise from the left, with pressure rise displayed above the zero line and pressure fall displayed below the zero line. With leg elevation, LV pressure and rate of pressure development and pressure decline increased. In the right panel, leg elevation resulted in impairment of LV function. This is manifested by a decrease in dP/dtmaxand a deceleration of LV pressure fall.