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Ventricular arrhythmia induced by sodium channel blocker in patients with Brugada syndrome.

Abstract：

OBJECTIVES:We administered pilsicainide chloride, a class Ic pure sodium channel blocker, to patients with Brugada syndrome (BS) and evaluated the occurrence of ventricular arrhythmia (VA) and T-wave alternans (TWA). BACKGROUND:Ventricular arrhythmia and TWA are sometimes induced by a sodium channel blocker challenge test in BS patients, but the significance of the induced VA and TWA is not known. METHODS:Pilsicainide was administered to 65 patients with BS (10 symptomatic and 55 asymptomatic patients), and the occurrence of VA, TWA, and change of electrocardiogram were evaluated. Electrophysiologic study was performed in 57 patients, and the induction of VA by programmed electrical stimulation (PES) was evaluated. RESULTS:Ventricular arrhythmia was not induced by administration of pilsicainide in 55 patients (no-VA group). Administration of pilsicainide-induced VA in 10 patients (Pil-VA group) and polymorphic ventricular tachycardia in four patients. Pilsicainide-induced VA in 60% of the symptomatic patients but in only 7% of asymptomatic patients (p < 0.01). ST level, QTc, and indexes of cardiac conduction in the Pil-VA group were not different from those in the no-VA group. Ventricular fibrillation was induced by PES in 67% of the patients in the Pil-VA group and in 33% of the patients in the no-VA group. In six cases, macroscopic TWA occurred in association with pilsicainide-induced VA, but TWA occurred in only one patient without pilsicainide-induced arrhythmia. CONCLUSIONS:Administration of a sodium channel blocker results in induction of not only ST-elevation but also VA and TWA in patients with BS.

journal_name

J Am Coll Cardiol

journal_title

Journal of the American College of Cardiology

authors

Morita H,Morita ST,Nagase S,Banba K,Nishii N,Tani Y,Watanabe A,Nakamura K,Kusano KF,Emori T,Matsubara H,Hina K,Kita T,Ohe T

doi

10.1016/j.jacc.2003.06.004

subject

Has Abstract

pub_date

2003-11-05 00:00:00

pages

1624-31

issue

9

eissn

0735-1097

issn

1558-3597

pii

S0735109703011240

journal_volume

42

pub_type

杂志文章

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