+ Brugada Criteria

• 1) Absence of RS waves in pre-cordial leads
• 2) RS length > 100ms
• 3) AV dissociation

+ Morphology Criteria

RBBB Morphology (R-dominant)

• Smooth monophasic R wave
• Notched downslope to the R wave — "taller left rabbit ear"
• A qR complex (small Q wave, tall R wave) in V1

LBBB Morphology (L-dominant)

• Initial R wave > 30-40 ms duration
• Notching or slurring of the S wave
• RS interval (time from R wave onset to S wave nadir) > 60-70 ms.

*LIFTL has wonderful examples of all of the above

+ Answer Explanation