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  • Title: Left-sided intraventricular conduction delay concealed by right bundle branch block.
    Author: Castellanos A, Munoz Fdel C, Martel JA.
    Journal: J Electrocardiol; 2008; 41(4):357-9. PubMed ID: 18342878.
    Abstract:
    The electrocardiograms of a 69-year-old woman with severe heart failure showed a left-sided nonspecific intraventricular conduction delay (QRS duration, 0.13 seconds) characterized by notches and slurrings in the descending part of the R waves in the left precordial leads and in the ascending parts of the S waves in the right precordial leads. Subsequently, a complete right bundle branch block with wider QRS complexes (0.17 seconds) appeared. It is possible to consider that the left-sided nonspecific intraventricular conduction delay was concealed by the greater conduction delay occurring when the complete right bundle branch block was present. This would be in keeping with a previous study using Doppler tissue imaging in which this was postulated but where the corresponding electrocardiograms were not shown.
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