The ECG showed sinus rhythm, normal QRS duration, and left ventricular hypertrophy with repolarization changes. An echocardiogram demonstrated marked thickening and heavy trabeculation of the apical half of the left ventricle. Color Doppler displayed flow within the deep intertrabecular recesses. The left ventricle was not dilated. There was diffuse left ventricular hypokinesis with an ejection fraction of 20% to 25%. The right ventricle appeared to be more heavily trabeculated than usual. No additional abnormalities were present. The findings were consistent with isolated noncompaction of the ventricular myocardium.