Population
3 cases in which left anterior hemiblock (LAH) obscured the diagnosis of right bundle branch block (RBBB)
Design
Case_series
Authors
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LAH may mask RBBB on standard ECG; case reports leave open whether supplementary leads improve detection.
Left anterior hemiblock can obscure the electrocardiographic diagnosis of right bundle branch block, which can be uncovered by recording additional unipolar high and right-sided chest leads.
Rosenbaum et al. (1973) studied this question.
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