Factors for transient entrainment of ventricular tachycardias by rapid atrial pacing

The American Journal of Cardiology
M NishizakiM Hiraoka

Abstract

Thirteen patients with sustained ventricular tachycardia (VT) were studied to elucidate predisposing factors for the development of constant and progressive fusion by rapid atrial pacing. All patients demonstrated transient entrainment by rapid ventricular pacing during VT. Constant and progressive fusion were observed in 7 patients (positive group) during rapid atrial pacing, but not in 6 (negative group). In the positive group, VT was induced by atrial pacing in 2 patients. The demonstration of constant and progressive fusion by atrial pacing was not dependent on QRS morphology or ventriculoatrial conduction during VT. VT cycle length in the positive group (363 +/- 59 ms) was longer than in the negative group (297 +/- 31 ms; p = 0.033). The maximal atrial pacing rate producing 1:1 atrioventricular (AV) conduction in the positive group was 171 +/- 18 beats/min compared with 125 +/- 22 beats/min in the negative group (p = 0.002). There were distinct differences between the positive and negative groups in the ratio of VT cycle length to minimal atrial cycle length causing 1:1 AV conduction (1.02 +/- 0.12 vs 0.61 +/- 0.12; p = 0.0001). It is concluded that AV conduction, VT cycle length and especially their ratio are important fa...Continue Reading

References

Jul 1, 1979·The American Journal of Cardiology·D P ZipesD H Pedersen
Jan 1, 1989·Pacing and Clinical Electrophysiology : PACE·A L Waldo, R W Henthorn
Apr 1, 1989·Pacing and Clinical Electrophysiology : PACE·Y AizawaM E Josephson
Aug 1, 1985·The American Journal of Cardiology·J M AlmendralM E Josephson
Feb 1, 1984·Journal of the American College of Cardiology·P Brugada, H J Wellens
Jan 15, 1984·The American Journal of Cardiology·K P AndersonJ W Mason

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