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. Author manuscript; available in PMC: 2011 Jun 1.
Published in final edited form as: JACC Cardiovasc Imaging. 2010 Jun;3(6):567–575. doi: 10.1016/j.jcmg.2009.12.017

Figure 1. Heart Failure Patients with LBBB.

Figure 1

A. 70 ms rS duration in V1/V2 indicates rapid initial myocardial activation via intact RBB despite LBBB.

ECGI Maps Epicardial surfaces of both ventricles are displayed in 3 views. “Anterior” depicts the RV free wall. Left anterior descending (LAD) artery is marked..

B Normal RV epicardial voltage (blue, anteriorly) contrasts with extensive LV disease.

C RV breakthrough (*) occurs laterally within 25 ms. Following RV activation is even, radial, and rapid (widely spaced isochrones) and completes within 45 ms. The LV is then depolarized. Thick black markings indicate line/region of conduction block.