1. One tachycardia with two entrainment responses: What is the mechanism?
Hetal Bhakta, MD, Xunzhang Wang, MD, Nigel Gupta, MD, Sen Ji, MD, PhD 
Heart Rhythm 
Volume 7, Issue 1, Pages (January 2010)
DOI: /j.hrthm
Copyright © 2010 Heart Rhythm Society Terms and Conditions

2. Figure 1
Ventricular entrainment pacing with a true VAAV response. The entrainment was delivered at a relatively early time of the ventricular cycle (V-V1 230 ms) (A) and the response to the entrainment (B).
Heart Rhythm 2010 7, DOI: ( /j.hrthm )
Copyright © 2010 Heart Rhythm Society Terms and Conditions

3. Figure 2
Ventricular entrainment pacing with a pseudo-VAAV response. The entrainment was delivered at a time relatively late in the ventricular cycle as compared with Figure 1A, with V-V1 330 ms (A) and the response to the entrainment (B).
Heart Rhythm 2010 7, DOI: ( /j.hrthm )
Copyright © 2010 Heart Rhythm Society Terms and Conditions