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Figure 1 Characteristic Echocardiographic Features of Obstructive HCM

(A) Parasternal long-axis view depicting severe asymmetric septal hypertrophy and systolic anterior mitral valve motion (arrowhead); (B) M-mode across the mitral leaflets depicting prominent systolic anterior motion (thick arrows) of the anterior mitral leaflet (SAM); (C) M-mode tracing across the aortic valve demonstrating partial closure of aortic leaflets (arrowheads); and (D) accentuation of late-peaking dynamic left ventricular outflow tract obstruction after the Valsalva maneuver. Ao = aorta; HCEM = hypertrophic cardiomyopathy; IVS = interventricular septum; LA = left atrium; SAM = systolic anterior motion; PW = posterior wall ratio