QRS duration greater than 120 milliseconds Absence of Q wave in leads I, V5 and V6 Monomorphic R wave in I, V5 and V6 ST and T wave displacement opposite to the major deflection of the QRS complex ...

However, unlike in the presence of a left bundle branch block, myocardial ischemia and infarction can easily be detected on ECG when a RBBB is present (see anterior and inferior wall MI examples).

It has also been defined as a "new" Left Bundle Branch Block (LBBB) in the setting of ... a LBBB and their likelihood of having an acute myocardial infarction.

In this case, we describe a case of atypical slow-slow AVNRT in a patient with dextrocardia and an unusual His bundle position ... localized to the mid-septal morphologic left atrium.