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Tpeak-Tend and Tpeak-Tend Dispersion as Risk Factors for Ventricular Tachycardia/ Ventricular Fibrillation in Patients With the Brugada Syndrome
Castro Hevia, Jesus; Antzelevitch, C; Tornés Bárzaga, F; Dorantes Sánchez, M; Dorticós Balea, F; Zayas Molina, R; Quiñones Pérez, MA; Fayad Rodríguez, Y.
Afiliação
  • Castro Hevia, Jesus; the Arrhythmia Unit. Cardiovascular Surgery and Cardiology Institute. Havana. Cuba
  • Antzelevitch, C; the Masonic Medical Research Laboratory. National Institutes of Health. Utica. New York
  • Tornés Bárzaga, F; the Arrhythmia Unit. Cardiovascular Surgery and Cardiology Institute. Havana. Cuba
  • Dorantes Sánchez, M; the Arrhythmia Unit. Cardiovascular Surgery and Cardiology Institute. Havana. Cuba
  • Dorticós Balea, F; the Arrhythmia Unit. Cardiovascular Surgery and Cardiology Institute. Havana. Cuba
  • Zayas Molina, R; the Arrhythmia Unit. Cardiovascular Surgery and Cardiology Institute. Havana. Cuba
  • Quiñones Pérez, MA; the Arrhythmia Unit. Cardiovascular Surgery and Cardiology Institute. Havana. Cuba
  • Fayad Rodríguez, Y; the Arrhythmia Unit. Cardiovascular Surgery and Cardiology Institute. Havana. Cuba
J Am Coll Cardiol ; 47(9)May 2006. tab, graf
Article em En | CUMED | ID: cum-40006
Biblioteca responsável: CU1.1
ABSTRACT
OBJECTIVES Our objective in this study was to evaluate Tpeak-Tend interval (Tp-e) and other electrocardiographic parameters as risk factors for recurrence of life-threatening cardiac events in patients with the Brugada syndrome (BS). BACKGROUND The Tp-e interval in the electrocardiogram (ECG) has been reported to predict life-threatening arrhythmias in the long QT syndrome. METHODS: Twenty-nine patients with the ECG pattern of BS and 29 healthy age- and gender-matched controls were studied. The follow-up period was 42.65 ± 24.42 months (range 11 to 108 months). RESULTS Upon presentation, five patients had suffered aborted sudden death, five syncope, and two presyncope. Eleven patients with the ECG pattern of BS had a prolonged (>460 ms) QTc in V2 but usually not in inferior or left leads. No patient had abnormally prolonged QT dispersion. Programmed electrical stimulation induced ventricular tachycardia/fibrillation in 5 out of 26 patients. Inducibility did not predict recurrence of events. Cardioverter-defibrillators were implanted in 14 patients (all symptomatic and two asymptomatic). During follow-up, nine symptomatic patients experienced recurrences. Previous cardiac events and a QTc >460 ms in V2 were significant risk factors (p = 0.00002 and p = 0.03, respectively). Tp-e and Tp-e dispersion were significantly prolonged in patients with recurrences versus patients without events (104.4 and 35.6 ms vs. 87.4 and 23.2 ms; p = 0.006 and p = 0.03, respectively) or controls (90.7 and 17.9 ms; p = 0.02 and p = 0.001, respectively).CONCLUSIONS Our study demonstrates significant correlation between previous events, QTc >460 ms in V2, Tp-e, and Tp-e dispersion and occurrence of life-threatening arrhythmic events, suggesting that these parameters may be useful in risk stratification of patients with the Brugada syndrome(AU)
RESUMEN
OBJETIVOS Nuestro objetivo en este estudio fue evaluar Tpeak-Tienden intervalo (Tp-e) y otros parámetros electrocardiográficos como factores de riesgo para la recurrencia en peligro la vida de eventos cardíacos en pacientes con el síndrome de Brugada (BS). ANTECEDENTES El Tp-e intervalo en el electrocardiograma (ECG) se ha informado a predecir las arritmias que amenazan la vida en el síndrome del QT largo. MÉTODOS: Veintinueve pacientes con el patrón de ECG de BS y 29 sanos de edad y el sexo-los controles se estudiaron. El período de seguimiento fue de 42,65 ± 24,42 meses (rango 11 a 108 meses). RESULTADOS: Tras la presentación, cinco pacientes habían sufrido una muerte súbita abortada, cinco síncope, y dos presincope. Once pacientes con el patrón de ECG BS había un prolongado (> 460 ms) QTc en V2 pero generalmente no en la izquierda inferior o conduce. Ningún paciente había anormalmente dispersión QT prolongado. Inducida por la estimulación eléctrica programada taquicardia ventricular / fibrilación en 5 de 26 pacientes. Inducibility no predecir la recurrencia de eventos. Cardioverter-desfibriladores se implantaron en 14 pacientes (todos los sintomáticos y dos asintomáticos). Durante el seguimiento, nueve pacientes presentaron recidivas sintomáticas. Anteriores eventos cardíacos y un QTc> 460 ms en V2 fueron importantes factores de riesgo (p = 0,00002 yp = 0,03, respectivamente). Tp y Tp-e-e dispersión se prolongó significativamente en los pacientes con recidivas frente a los pacientes sin eventos (104,4 y 35,6 ms frente a 87,4 y el 23,2 ms, p = 0,006 y p = 0,03, respectivamente) o los controles (90,7 y 17,9 m, p = 0,02 yp = 0,001, respectivamente)..........
Assuntos
Texto completo: 1 Coleções: 06-national / CU Base de dados: CUMED Assunto principal: Fibrilação Ventricular / Bloqueio de Ramo / Taquicardia Ventricular / Eletrocardiografia Tipo de estudo: Etiology_studies / Prognostic_studies / Risk_factors_studies Limite: Adult / Female / Humans / Male Idioma: En Revista: J Am Coll Cardiol Ano de publicação: 2006 Tipo de documento: Article
Texto completo: 1 Coleções: 06-national / CU Base de dados: CUMED Assunto principal: Fibrilação Ventricular / Bloqueio de Ramo / Taquicardia Ventricular / Eletrocardiografia Tipo de estudo: Etiology_studies / Prognostic_studies / Risk_factors_studies Limite: Adult / Female / Humans / Male Idioma: En Revista: J Am Coll Cardiol Ano de publicação: 2006 Tipo de documento: Article