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M-mode and cross-sectional echocardiographic study of the left ventricular wall motions in complete left bundle-branch block.

M-mode and cross-sectional echocardiograms of 37 patients with complete left bundle-branch block were compared with those of 5 patients with complete atrioventricular block during right ventricular pacing, 20 patients with anteroseptal infarction, and 20 normal subjects. Of 37 patients with complete left bundle-branch block, 35 showed 3 types (A, B, and C) ofabnormal septal motion and 2 patients showed normal septal motion. In type A and B, early and abrupt posteriorlydirected motion of the septum occurred during the pre-ejection period. After this early abnormal motion, the septum moved anteriorly in type A and posteriorly in type B. Type C exhibited akinetic