Figure 1:
Left ventricular outflow tract obstruction due to narrowing of the left
ventricular outflow tract by septal hypertrophy and anterior
displacement of the papillary muscles and the mitral valve leaflet. A,
B, C, and D represent doppler velocity recordings throughout systole in
A (ascending aorta – forward towards transducer), B (contact between
mitral valve and septum), C (left atrium), and D (apex of left
ventricle). B, C, and D show that flow is away from the transducer.
Aortic velocity waveform (A) indicates reduced forward flow in the
presence of obstruction. Ao (aorta), LV (left ventricle), MV (mitral
valve), LA (left atrium).