This case demonstrates that Type A WPW syndrome can be obscured by left bundle branch block and may be associated with a vascular malformation of the coronary sinus.
WPW may be masked by LBBB with coronary sinus anomaly; case report leaves open prevalence and diagnostic implications.
A case of Wolff-Parkinson-White syndrome type A with coexisting ipsilateral bundle branch block is presented. The diagnosis was suspected because of subtle electrocardiographic changes and was confirmed at electrophysiological study. Necropsy showed a vascular anomaly of the coronary sinus that contained bundles of myocardial muscle which crossed the atrioventricular ring at a site that was consistent with the predicted accessory pathway.
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Robinson et al. (1988) studied this question.
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