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  Indian J Med Microbiol
 

Figure 1: Electrophysiological study of the patient. (a) A baseline electrocardiogram showed no preexcitation. (b) Electrocardiogram of the documented wide complex tachycardia. (c) The His-ventricular (HV) interval was 50 ms during sinus rhythm. (d) The earliest atrial activation site in the bundle of His region could change to the proximal coronary sinus when burst pacing. (e) A fixed HV interval of 50 ms was seen during the wide complex tachycardia (WCT). (f) Atrial pacing reset the WCT. (g) Ventricular overdrive pacing reset the WCT and revealed a “V-A-V” pattern

Figure 1: Electrophysiological study of the patient. (a) A baseline electrocardiogram showed no preexcitation. (b) Electrocardiogram of the documented wide complex tachycardia. (c) The His-ventricular (HV) interval was 50 ms during sinus rhythm. (d) The earliest atrial activation site in the bundle of His region could change to the proximal coronary sinus when burst pacing. (e) A fixed HV interval of 50 ms was seen during the wide complex tachycardia (WCT). (f) Atrial pacing reset the WCT. (g) Ventricular overdrive pacing reset the WCT and revealed a “V-A-V” pattern