Left bundle branch block

Revision as of 06:35, 5 April 2019 by Rossdonaldson1 (talk | contribs)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)


Bundle Branch Block.png
  • ST Depression and T wave inversion are common
  • QRS > 0.12 in limb leads
  • Leads
    • Large and wide R waves — leads I, aVL, V5, and V6
    • Small R wave followed by deep S wave —leads II, III, aVF, V1–V3

Differential Diagnosis

Wide-complex tachycardia

Assume any wide-complex tachycardia is ventricular tachycardia until proven otherwise (it is safer to incorrectly assume a ventricular dysrhythmia than supraventricular tachycardia with abberancy)

^Fixed or rate-related

See Also


  • Journal of Electrocardiology. Vol 43 (2010). 40-42.