RSR' Pattern in V1: Right Bundle Branch Block Characteristics and Significance

Diagnostic Criteria

The American College of Cardiology recommends a QRS duration ≥120 ms in adults, >100 ms in children ages 4-16 years, and >90 ms in children <4 years of age for the diagnosis of complete RBBB 2
The American College of Cardiology suggests an RSR', rsR', rSR', or rarely a qR pattern in leads V1 or V2 for the diagnosis of complete RBBB 2
The American College of Cardiology recommends an S wave of greater duration than R wave or >40 ms in leads I and V6 for the diagnosis of complete RBBB 2
The American College of Cardiology suggests a normal R peak time in leads V5 and V6 but >50 ms in lead V1 for the diagnosis of complete RBBB 2

The American College of Cardiology considers an RSR' pattern in V1 and V2 with a normal QRS duration as a normal variant in children 2
The American College of Cardiology recommends against using the terms "RSR" and "normal RSR" to describe such patterns due to potential misinterpretation 2
In athletes, an RSR' pattern with normal QRS duration is often considered benign, according to the American College of Cardiology 3

Complete RBBB indicates conduction tissue disease affecting the right bundle branch, according to the American College of Cardiology 4