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Caracterización de los potenciales dobles durante la taquicardia ventricular. Estudios durante el arrastre
B Olshansky1, D Moreira, A L Waldo
1University Hospitals of Cleveland/Case Western Reserve University, Ohio.
Circulation
|February 1, 1993
Resumen
Los potenciales dobles durante la taquicardia ventricular humana indican un bloqueo dentro de un circuito de reentrada, no una conducción lenta. El arrastre transitorio reveló distintos frentes de onda de activación que rodean un área de bloque.
Área de la Ciencia:
- Cardiología Cardiología.
- Electrofisiología y electrofisiología.
- Las arritmias cardíacas son arritmias cardíacas.
Sus antecedentes:
- Se observan potenciales dobles durante las taquicardias reentrantes en modelos animales.
- Su importancia durante la taquicardia ventricular humana (VT) sigue sin estar clara.
Objetivo del estudio:
- Para aclarar el significado de los potenciales dobles registrados durante la VT humana utilizando el arrastre transitorio.
Principales métodos:
- El arrastre transitorio se empleó en tres pacientes con VT.
- Análisis de las deflexiones de doble potencial y su relación con las longitudes de ciclo de ritmo y los complejos QRS.
Principales resultados:
- Se capturaron potenciales dobles durante el arrastre, con distintos tiempos de activación cortos y largos.
- El corto intervalo se acortó con un ritmo más rápido, lo que sugiere que no representa una despolarización activa.
- Los cambios bruscos en la morfología indicaron una dirección de activación alterada, y los potenciales dobles desaparecieron con la interrupción de la VT.
Conclusiones:
- Los potenciales dobles durante VT significan frentes de onda de activación que flanquean un área de bloqueo dentro de un circuito de reentrada.
- Representan el bloque en el centro del circuito, no la conducción lenta en sí misma.
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