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Figure 3 Color M-mode Doppler of left ventricular filling obtained before (first image) and during caval occlusion (second and third images). Peak early filling component velocity decreases together with left ventricular end-diastolic pressure (LV-EDP), as demonstrated by the changes in pixel colors from yellow to red. In contrast the slope of the early filling wavefront which determines flow propagation velocity (vp) is unchanged. See text for details. LV-EDP = left ventricular end-diastolic pressure; vp = flow propagation velocity.