Usefulness of Doppler echocardiography for determining hemodynamic improvement with intravenous verapamil in hypertrophic cardiomyopathy

Abstract Verapamil is effective in the treatment of hypertrophic cardiomyopathy (HC). 1–4 Continuous-wave Doppler ultrasound is useful in the noninvasive assessment of high-velocity intracardiac blood flow. 5 We evaluated the hemodynamic response in a child with HC through intravenously administered verapamil during cardiac catheterization with simultaneous continuous-wave Doppler flow study for the noninvasive evaluation of changes in left ventricular (LV) outflow obstruction.