Figure legends
Figure 1
12-lead
ECG and intracardiac electrogram showed normal P-R/H-V interval during
sinus rhythm and constant H-V during atrial extrastimulus. CS=coronary
sinus; ECG=electrocardiogram; RV=right ventricle.
Figure 2
A:
A sensed atrial extrastimulus delivered from CS5-6 during the wide QRS
tachycardia, advanced the subsequent ventricular activation and reset
the tachycardia, with unchanged QRS configuration. B: Termination of the
tachycardia with an atrial signal. The 3 sinus beats after tachycardia
showed prominent delta wave during isoproterenol infusion. See text for
discussion. CS=coronary sinus; RV=right ventricle.
Supplementary Figure 1 An early-coupled atrial extrastimulus encountered
the anterograde refractory period of the accessory pathway and
terminated the tachycardia. See text for discussion. CS=coronary sinus;
RV=right ventricle.