Abstract
Electrocardiograms of 3 patients with complete left bundle branch block and left axis deviation of ÂQRS greater than −30° in the frontal plane, who had either intermittent normal intraventricular conduction or restoration of normal intraventricular conduction within 12 hours of complete left bundle branch block, are presented. None of the 3 patients had abnormal left axis deviation during normal intraventricular conduction. These findings suggest that left axis deviation of ÂQRS greater than −30° in patients with left bundle branch block is not reliable evidence for block within the anterior fascicles of the left bundle in addition to block of the left main bundle.
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