1. Right Bundle Branch Block (RBBB) Interpretation In cases of new-onset RBBB, the EKG hallmark is “up and down” QRS complexes in leads V1–V2, classically termed the “rabbit ears” pattern (rsR’). This finding always warrants urgent investigation, as acute RBBB may signal life-threatening conditions like pulmonary embolism, congenital heart disease (CHD), or cardiomyopathy. The critical […]