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. Author manuscript; available in PMC: 2019 Oct 4.
Published in final edited form as: J Electrocardiol. 2018 Jul 10;51(5):859–862. doi: 10.1016/j.jelectrocard.2018.07.004

Figure 1.

Figure 1.

Patient 1: With AAI pacing the ECG (25mm/s) demonstrated the baseline LBBB (a), electroanatomic map (RAO on left, LAO on right) demonstrated earliest LV activation at the apical septum with late activation at the basolateral wall (b), and longitudinal strain imaging demonstrates a “classic pattern” of LV dyssynchrony with early septal contraction (blue arrow), early lateral wall stretch (yellow arrow), and delayed lateral wall peak contraction (red arrow) after aortic valve closure (green line)(c). With AV sequential basolateral LV only pacing, the ECG demonstrates wavefront fusion (positive in I and V1) with a narrowed QRS (d), electroanatomic map (RAO on left, LAO on right) demonstrates earliest activation at mid and apical septum and inferolateral wall (site of LV pacing) (e), and longitudinal strain demonstrates resolution of the “classic pattern” of LV dyssynchrony with near simultaneous contraction of all opposing walls (f).