LBBB vs IVCD ± LVH

  • Used to distinguish true LBBB from other causes of LBBB-like pattern, such as LVH, LAFB + LVH. Patients with true LBBB may have greater benefit from cardiac resynchronization therapy.

Criteria

  • QRS duration ≥ 140 msec men or ≥ 130 msec women
  • QS or rS in leads V1 and V2
  • mid-QRS notching or slurring in ≥ 2 leads V1, V2, V5, V6, I, aVL
  • All 3 criteria must be met to diagnose true LBBB

Reference