Hypertrophic cardiomyopathy: the importance of arrhythmic events in patients at risk for sudden cardiac death



Título del documento: Hypertrophic cardiomyopathy: the importance of arrhythmic events in patients at risk for sudden cardiac death
Revue: Arquivos brasileiros de cardiologia
Base de datos: PERIÓDICA
Número de sistema: 000288980
ISSN: 0066-782X
Autores: 1
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Instituciones: 1Universidade de Sao Paulo, Faculdade de Medicina, Sao Paulo. Brasil
Año:
Periodo: Nov
Volumen: 87
Número: 5
Paginación: 649-657
País: Brasil
Idioma: Portugués, inglés
Tipo de documento: Estadística o encuesta
Enfoque: Caso clínico
Resumen en inglés OBJECTIVE: It is controversial the correlation between complex ventricular arrhythmia of hypertrophic cardiomyopathy and cardiac sudden death (CSD). In patients with hypertrophic cardiomyopathy and at risk for CSD that have been undergone implantable cardioverter-defibrillator (ICD) implantation, we evaluated: a- occurrence of arrhythmic events; b- clinical event occurrence and its correlation with arrhythmic events; c- ICD shock therapy occurrence and clinical-functional correlation; d- prognosis clinical-functional predictors. METHODS: Twenty-six patients have been studied. They presented hypertrophic cardiomyopathy and risk factors for CSD. These patients underwent ICD implantation, period May, 2000 through January, 2004 (average follow-up - 19 months). Fourteen patients (53.8%) were female and the mean age was 42.7. Sixteen patients (61.5%) ICD was performed due to primary prevention for sudden death and ten (38.5%) secondary prevention. Twenty patients (76.9%) had had syncope, previus to ICD implantation, half of them associated with ventricular fibrillation or sustained ventricular tachycardia; 15 had had family sudden death; 12 patients (46.2%) presented non-sustained ventricular tachycardia at 24-hour Holter and 5 (19.2%) showed the ventricular septum thickness larger than 30 mm. RESULTS: During the follow-up, 4 shocks therapy were recorded by ICD in potentially lethal arrythmias (3 sustained ventricular tachycardia and 1 ventricular fibrillation). There was one death, due to likely stroke. Four patients had syncope recurrence, with no arrhythmic event recorded by ICD. The statistical analysis has showed precocity significance of ICD shock, in patients whose ventricular septum thickness was larger than 30 mm. CONCLUSION: 1- arrhythmic events have occurred in 50% of the patients. Most of those events (62%) were ventricular tachycardia, 31% sustained tachycardia and 31% non-sustained ventricular tachycardia. The remainders had supraventricular tachycard
Resumen en portugués OBJETIVO: Pretende-se avaliar em pacientes com cardiomiopatia hipertrófica e risco de MSC, submetidos a implante de cardioversor-desfibrilador implantável (CDI): a) ocorrência de eventos arrítmicos; b) ocorrência de eventos clínicos e correlações com eventos arrítmicos; c) ocorrência de terapia de choque do CDI e correlações clínico-funcionais; d) preditores clínico-funcionais de prognóstico. MÉTODOS: Foram estudados 26 pacientes com cardiomiopatia hipertrófica e fatores de risco de MSC, submetidos a implante de CDI no período de maio de 2000 a janeiro de 2004 (seguimento médio = 20 meses). Quatorze pacientes (53,8%) eram do sexo feminino e a idade média foi de 42,7 anos. Em 16 pacientes (61,5%), a indicação do CDI foi para prevenção primária de morte súbita cardíaca, e em 10 (38,5%), para prevenção secundária. Vinte pacientes (76,9%) apresentavam síncope prévia ao implante de CDI, metade desses relacionados a fibrilação ventricular ou taquicardia ventricular sustentada; 15 (57,7%) tinham história de morte súbita familiar; 12 pacientes (46,2%), taquicardia ventricular não-sustentada ao Holter de 24 horas; e 5 (19,2%) apresentavam o septo interventricular com espessura maior que 30 mm. RESULTADOS: No seguimento foram registrados no CDI 4 terapias de choque em arritmias potencialmente letais (3 pacientes com taquicardia ventricular sustentada e 1 paciente com fibrilação ventricular). Ocorreu um óbito por provável acidente vascular cerebral tromboembólico. Quatro pacientes tiveram recorrência de síncope sem evento arrítmico registrado
Disciplinas: Medicina
Palabras clave: Diagnóstico,
Sistema cardiovascular,
Muerte súbita,
Miocardiopatía hipertrófica,
Arritmias,
Cardiodesfibrilador implantable,
Factores de riesgo,
Pronóstico,
Seguimiento
Keyword: Medicine,
Cardiovascular system,
Diagnosis,
Sudden death,
Hypertrophic cardiomyopathy,
Arrhythmias,
Implantable cardioverter,
Risk factors,
Prognosis,
Follow up
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