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. Author manuscript; available in PMC: 2017 Aug 15.
Published in final edited form as: Am J Cardiol. 2016 May 28;118(4):527–534. doi: 10.1016/j.amjcard.2016.05.049

FIGURE 2. Strict Criteria for Complete Left Bundle Branch Block.

FIGURE 2

Sample 12-lead ECG of patient who meets strict LBBB criteria. In this example male patient, the QRS duration is >140ms, there is an RS in lead v3, and there is mid-QRS slowing/notching in leads v1, v2, v5, and v6.