Transient right bundle branch block unmasking anteroseptal infarction concealed by left posterior fascicular block.


A case of acute anteroseptal myocardial infarction (MI) associated with transient right bundle branch block (RBBB) and a probably persistent left posterior fascicular block is reported. When the RBBB disappeared, small initial r waves were present in the right precordial leads concealing the evidence of MI. Finally, the electrocardiographic pattern evolved… (More)


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