Hypertrophic obstructive cardiomyopathy, or HOCM, is a subtype of hypertrophic cardiomyopathy in which the thickened interventricular septum creates a dynamic obstruction in the left ventricular outflow tract during systole. On echocardiography, characteristic findings include systolic anterior motion of the mitral valve leaflet toward the septum, a high-velocity Doppler signal in the outflow tract with a distinctive dagger-shaped waveform, and mitral regurgitation caused by the distorted valve position. The degree of obstruction can vary with heart rate, hydration status, and activity level. Echocardiography is essential for diagnosing HOCM, quantifying the obstruction gradient, and monitoring the response to medical or surgical treatment.
Sonography Term