Left bundle branch block

1. ST Depression and TWI are common
2. QRS > 0.12 in limb leads
3. Leads
   1. Large and wide R waves — leads I, aVL, V5, and V6
   2. Small R wave followed by deep S wave —leads II, III, aVF, V1–V3

LBBB

See Also

• ECG (Main)
• Sgarbossa's Criteria
• STEMI equivalents

Source

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