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Figure 3 Midsystolic Drop in LV Velocity Seen on CW and PW Tracings

(Left) Continuous-wave (CW) Doppler through the left ventricular outflow tract (LVOT) in obstructive hypertrophic cardiomyopathy. The midsystolic drop (MSD) flow velocity curve (arrowheads) is seen superimposed on the higher LVOT ejection flow velocity signal. (Right) Pulsed-wave (PW) Doppler recording just apical of the entrance to the LVOT. Long arrow points to the nadir of LV MSD flow velocity.