PMC4054846_01
'Masquerading' bundle branch block: ECG in figure showing right bundle branch block in the precordial leads with left bundle branch block in frontal leads and left axis deviation.
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Electrocardiogram (ECG) showed right bundle branch block with left axis deviation (Fig. 1). ECG features in Fig. 1 are suggestive of right bundle branch block (RBBB) in the precordial leads with left bundle branch block (LBBB) in frontal leads and left axis deviation (LAD). Fig. 1 ECG also shows probably severe delay in conduction in left bundle with loss of Q in lead I.