Right bundle branch block

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Bundle Branch Block.png
  • QRS > 0.12 in limb leads
  • Triphasic QRS (rSR') or biphasic (qR), often with ST depression & TWI in V1-V3
    • V1 must have a positive complex
    • ST depression and TWI in other leads should arouse suspicion
  • Slurred S in 1 and V6
  • Any ST elevation is abnormal in RBBB and must prompt evaluation for STEMI
RBBB V1 Morphologies

See Also


  • Adapted from Niemann, Lampe, Pani, Donaldson, ECGpedia.org
  • Journal of Electrocardiology. Vol 43 (2010). 40-42.