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European Heart Journal 1991 12(3):401-404;
Copyright © 1991 by the European Society of Cardiology.
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© 1991 The European Society of Cardiology

Incidence and significance of inducible supraventricular tachyarrythmias in patients with chronic myocardial infarction

B. BREMBILLA-PERROT, A. TERRIER DE LA CHAISE, M. LESSA DE SOUZA and L. BAILLY

Cardiologie Chu of Brabois, 54500 Vandoeuvre, France

Received 18 September 1989; revised 1 May 1990; .

Correspondence: Béatrice Brembilla-Perrot, Cardiologie, Chu de Brabois, 54500 Vandoeuvre Les Nancy, France.

Abstract

In order to evaluate the incidence and significance of inducible supra-ventricular (SVTA) in patients with chronic myocardial infarction (MI), the results of systematic programmed atrial stimulation were compared in two groups of patients: 150 patients (group I) without MI or underlying heart disease, studied for syncope or conduction disturbances, 296 patients (group II) studied after an acute MI (>1 month). None of them had spontaneous SVTA, and 24-h Holier monitoring showed no SVTA. The atrial stimulation programme used one and two extra stimuli delivered during sinus rhythm and atrial pacing (600 ms and 10% less than the sinus cycle length). A sustained (S) (>30 s) supraventricular tachycardia (SVT) (atrial flutter, fibrillation, tachycardia) was induced in 17 patients in group I (11% ) and in 120 patients in group II (40.5%). In group II inducible SVTA could not be correlated with the occurrence of a SVT during acute MI, the location of Ml, the value of LV ejection fraction (EF), the incidence of inducible sustained ventricular tachycardia (VT), or fibrillation (VF). However, inducible SVTA could be correlated with a significantly shorter effective atrial refractory period (197±23ms vs 220±35ms, P<0.001) and a shorter retrograde block cycle length (518±215 vs 585±215 ms, P<0.03). The patients in group II were followed-up for at least 6 months: 12 of them developed sustained episodes of supraventricular tachycardia; 11 of them had inducible SVTA (P<0.001).

In conclusion, chronic MI is associated with a high incidence of inducible SVTA but the prognostic significance of these arrhythmias seems weak.

Key Words: Myocardial infarction • supraventricular tachyarrhythmias • programmed atrial stimulation


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