Infarction patterns in endocardial fibroelastosis.

Three cases of endocardial fibroelastosis with vectorcardiographic findings suggestive of an anterior myocardial infarct are presented. It had been previously reported that such vectorcardiographic features were diagnostic of anomalous origin of the left coronary artery. We conclude that the two diseases can not be differentiated on the basis of electrocardiography or vectorcardiography alone. Two of the cases presented were in identical twins; serial scalar electrocardiograms and vectorcardiograms were obtained during the development and progression of endocardial fibroelastosis.