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JACC Clin Electrophysiol. 2018 Jul;4(7):872-880. doi: 10.1016/j.jacep.2018.01.020. Epub 2018 Mar 28.

Use of Programmed Ventricular Extrastimulus During Supraventricular Tachycardia to Differentiate Atrioventricular Nodal Re-Entrant Tachycardia From Atrioventricular Re-Entrant Tachycardia.

Author information

1
Division of Cardiology, Department of Medicine, Showa University, Tokyo, Japan. Electronic address: hiroic2004@yahoo.co.jp.
2
Section of Cardiac Electrophysiology, Division of Cardiology, University of California, San Francisco, San Francisco, California.
3
Division of Pediatric Cardiology, Department of Pediatrics, University of California, San Francisco, San Francisco, California.
4
Section of Electrophysiology, Division of Cardiology, University of California, San Diego, San Diego, California.
5
Section of Cardiac Electrophysiology, Division of Cardiology, University of California, San Francisco, San Francisco, California; San Francisco VA Medical Center, San Francisco, California.

Abstract

OBJECTIVES:

This study hypothesized that early coupled ventricular extrastimuli (V2) stimulation might yield a more robust differentiation between atrioventricular nodal re-entrant tachycardia (AVNRT) and atrioventricular re-entrant tachycardia (AVRT).

BACKGROUND:

Programmed V2 during supraventricular tachycardia are useful to differentiate AVNRT from AVRT by subtracting the ventriculoatrial (VA) interval from the stimulus to atrial depolarization (stimulus atrial [SA]) interval, but all such maneuvers have limitations.

METHODS:

Patients with either AVNRT or AVRT were investigated. The entire tachycardia cycle length (TCL) was scanned with V2 delivered from the right ventricular apex. The SA-VA difference was calculated with V2 clearly resetting the tachycardia. The prematurity of V2 was calculated by dividing the coupling interval (CI) by the TCL.

RESULTS:

A total of 210 patients (102 with AVNRT) were included. The SA-VA difference was >70 ms in all AVNRT patients and was <70 ms in all AVRT patients with right and septal accessory pathways (APs), except for those with decremental APs, in whom there was an overlap between AVNRT and AVRT with left APs. However, a SA-VA difference >110 ms with a CI/TCL of <65% distinguished AVNRT from AVRT using the left AP, with sensitivity and specificity of 87% and 100%, respectively. Ventricular overdrive pacing resulted in tachycardia termination or AV dissociation in 28% of patients compared with 15% of patients using the V2 technique (p = 0.008).

CONCLUSIONS:

A SA-VA of >70 ms using the V2 technique differentiated AVNRT from AVRT using septal and right APs. Use of the V2 technique with a short CI differentiated AVNRT from AVRT using left APs. The V2 technique less frequently resulted in tachycardia termination compared with ventricular entrainment.

KEYWORDS:

coupling interval; premature ventricular extrastimulus; supraventricular tachycardia; ventricular entrainment; ventriculoatrial interval

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