Obstructive Hypertrophic Cardiomyopathy and Apical Middiastolic Murmur

A patient with obstructive idiopathic hypertrophic subaortic stenosis and an apical middiastolic murmur is described. Previous explanations for this murmur are reviewed. At surgery, fibromuscular bands between the interventricular septum and the lateral free wall of the left ventricle were found. The presence of these bands in this patient suggests another possible cause for these murmurs.