Abstract
Complete heart block developed in two patients during cardiac catheterization. Left bundle branch block was present in one patient prior to study and complete heart block developed during catheter manipulation in the right ventricle. Marked left axis deviation was the only conduction abnormality in the second patient. Right bundle branch block developed during right ventricular catheterization; complete heart block occurred shortly thereafter. It is suggested that a standby pacer is indicated during catheterization when transient right bundle branch block occurs in a patient with left axis deviation, as in patients with left bundle branch block prior to right heart catheterization.
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