Right Bundle Branch Block

Findings:

1. For complete RBBB the duration of the QRS complex is >0.10 seconds.With incomplete RBBB an rSR' pattern will be seen in lead V1 but the QRS duration will be within the limits of normal.
2. An rSR' or rR' pattern, with the initial r wave less than the R' or r', in leads V1 through V3 may be present. In leads I and V6 the S wave is wide.
3. The QRS axis may be normal or there may be right or left axis deviation.
4. The T wave is almost always inverted in lead V1 and may be inverted in V2. In the other precordial leads, and in the limb leads, the T wave is directed opposite to the terminal portion of the QRS complex.