Predictive Impact of the Inducibility of Ventricular Fibrillation in Patients With Brugada-Type ECG

Autor: Shoji Hirasawa, Hidehira Fukaya, Masaru Yuge, Takeshi Sasaki, Tohru Izumi, Shinichi Niwano, Sae Sasaki, Masahiko Moriguchi, Ryuta Imaki, Daisuke Sato
Rok vydání: 2006
Předmět:
Zdroj: International Heart Journal. 47:229-236
ISSN: 1349-3299
1349-2365
DOI: 10.1536/ihj.47.229
Popis: The natural history of asymptomatic individuals with a Brugada-type electrocardiogram (ECG) is still controversial. In this study, we evaluated ventricular fibrillation (VF) inducibility in Brugada-type ECG patients and compared it with other risk factors to clarify the significance of these data on their prognosis. The study population consisted of 38 patients who presented with a typical ST-segment elevation in the precordial leads and underwent an electrophysiological study (EPS). The patients were divided into 3 groups; group A: patients with spontaneous ventricular fibrillation (VF) (n = 5), group B: patients without clinical VF but with inducible VF in EPS (n = 16), and group C: patients with neither clinical nor inducible VF (n = 17). The clinical features, diagnostic results, and prognosis were compared among these groups. During the follow-up period of 26 +/- 19 months, 2/5 (group A), 1/16 (group B), and 0/17 (group C) patients suffered fatal arrhythmic events. None of the clinical features showed any significant difference, although the incidence of positive results in a drug challenge test was higher in groups A and B than in group C (P < 0.05). On the other hand, VF inducibility was higher in patients with positive results in the drug challenge test than in patients with negative results (59% versus 13%; P < 0.05). No VF episodes were observed in patients without VF induction, although one was observed in 1 of 16 patients with VF induction in asymptomatic Brugada syndrome. The drug challenge test appears to be useful for predicting VF inducibility even though it is a noninvasive test.
Databáze: OpenAIRE
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