Click on image to view larger version.

Figure 1 Measurements of isovolumic relaxation time (IVRT) and flow propagation velocity (FPV) in a patient with normal wedge pressure (actual pressure = 10 mm Hg) (panels A and B) and in a patient with high wedge pressure (actual pressure = 31 mm Hg) (panels C and D). In the first case, FPV is determined by the slope of the first aliasing line during early filling, from the mitral valve plane distally into the left ventricular cavity (panel B). Estimated wedge pressure = 13.5 mm Hg. In the second case, FPV is determined by the slope of the first clearly demarcated isovelocity line during early filling (panel D). Estimated wedge pressure = 28.8 mm Hg.