Ventricular tachycardia was noted in 4 members of the same family. One
showed diffuse hypokinesis of the left ventricle by echocardiography
and left ventriculography, 2 showed progressive left ventricular dysfu
nction and 1 showed regional perfusion defects of the left ventricle s
hown by thallium scintigraphy. One patient was diagnosed as dilated ca
rdiomyopathy. Although no definitive cause of the left ventricular dis
turbance was identified in the 3 other patients, they may have all bee
n dilated cardiomyopathy.