- Broad QRS > 120
- RSR’ pattern in V1-V3 (M shape)
- Wide, slurred S in lateral leads (I, aVL, V5-6)
- ST depression and T wave inversion V1 through V3
- ST depression in the lateral leads (V4-V6) CANNOT be explained by RBBB!
- Instead of RSR’ in V1, can have a monophasic R or a qR complex
- Incomplete RBBB if QRS < 120 ms
What does it all mean?
- Not as suggestive of ischemia as a LBBB is.
- Some people are born with them.
- Think: Lung disease (COPD, OSA, PE) or electrolyte abnormalities.
- Can still do an exercise treadmill test with a RBBB, but not with a LBBB.
– from FMTS presentation by Dr Karee Byram, PGY-3