Key result
Continuous electrocardiographic tracings in a patient with intermittent LBBB revealed QRS complexes resembling Wolff-Parkinson-White syndrome (type B) during the incomplete LBBB phase.
Case Report (n=1)
Incomplete LBBB can present with QRS morphology resembling Wolff-Parkinson-White syndrome (type B), highlighting the importance of differentiating these two entities.
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May mimic pre-excitation in incomplete LBBB; leaves open mechanistic and diagnostic implications.
Rate-dependent intermittent incomplete and complete left bundle-branch block (LBBB) is described in a patient without other evidence of heart disease. Continuous electrocardiographic tracings revealed QRS complexes intermediate in configuration between normal conduction and complete LBBB during the transitional phase from normal to abnormal conduction. This provided an opportunity to study the various grades of incomplete LBBB in man. During the incomplete LBBB phase, the morphology of the QRS complexes bore a close resemblance to the QRS form in the Wolff-Parkinson-White syndrome (type B). The differences between these two entities are emphasized.
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Barold et al. (1968) conducted a case report in Rate-dependent intermittent incomplete and complete left bundle-branch block (n=1). Continuous electrocardiographic tracings was evaluated on Morphology of QRS complexes during transitional phase. Continuous electrocardiographic tracings in a patient with intermittent LBBB revealed QRS complexes resembling Wolff-Parkinson-White syndrome (type B) during the incomplete LBBB phase.
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