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).