A left bundle branch block occurs when electrical conduction ... This results in widening of the QRS complex as described below. Approximately 50% of left bundle branch blocks are associated ...

Electrocardiograms, however, were interpreted as showing left bundle-branch block. Largely on the basis ... of a short PR interval and a prolonged QRS complex. The patient was considered to ...

left bundle branch block and intraventricular conduction delays, left atrial abnormality, and QT-interval prolongation. In addition to the above well-known applications of the ECG for patients ...

If the QRS complex is widened and downwardly deflected in lead V1, a left bundle branch block is present. If the QRS complex is widened and upwardly deflected in lead V1, a right bundle branch ...