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©2013 UpToDate ® Print Email Continuous wave (CW) Doppler echocardiogram showing a 100 mmHg gradient across the left ventricular outflow tract (LVOT) in a patient with hypertrophic cardiomyopathy (HCM) The continuous wave Doppler demonstrates the characteristic profile of dynamic left ventricular outflow tract obstruction; the peak velocity across the obstruction is 5 m/sec or a gradient of 100 mmHg. When severe, outflow tract signal can be difficult to distinguish between the mitral regurgitation that frequently accompanies systolic anterior motion of the mitral valve. Courtesy of Perry Elliot, MD.