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Síncope asociado con taquicardia supraventricular. ¿Una expresión de la frecuencia de la taquicardia o de la
1Department of Medicine, University of Western Ontario, London, Canada.
Circulation
|March 1, 1992
Resumen
El síncope durante la taquicardia supraventricular (SVT) está relacionado con los cambios en la presión arterial, no con la frecuencia cardíaca más rápida. Este hallazgo sugiere que los factores vasomotores, no la tasa de taquicardia, son la causa principal de los desmayos en pacientes con TVS.
Área de la Ciencia:
- Cardiología Cardiología.
- Electrofisiología y electrofisiología.
- La medicina clínica es la medicina clínica.
Sus antecedentes:
- El síncope durante la taquicardia supraventricular (SVT) se ha considerado un marcador para las tasas de taquicardia rápida.
- Comprender el mecanismo de síncope en la TVV es crucial para el manejo del paciente.
Objetivo del estudio:
- Investigar la relación entre las características de síncope y taquicardia en pacientes con TVS.
- Para determinar si el síncope durante la TMSV predice la frecuencia cardíaca más rápida o está relacionado con cambios hemodinámicos.
Principales métodos:
- Inducción de la taquicardia en posición supina y vertical (inclinación de la cabeza hacia arriba de 60 grados) en pacientes con varios tipos de TPSV.
- Realización de pruebas de inclinación en el ritmo sinusal con y sin isoproterenol.
- La medición de la duración del ciclo de taquicardia y los cambios en la presión arterial durante la taquicardia inducida y las pruebas de inclinación.
Principales resultados:
- La duración del ciclo de taquicardia fue más corta, y la presión arterial bajó más significativamente en posición vertical durante la TVA.
- El síncope durante la taquicardia vertical se asoció con una mayor caída en la presión arterial media, no con una duración del ciclo de taquicardia más corta.
- Los pacientes que experimentaron síncope durante la SVT tenían más probabilidades de tener síncope durante la prueba de inclinación en el ritmo sinusal.
Conclusiones:
- El síncope en SVT está relacionado principalmente con la inestabilidad vasomotora y las caídas de presión arterial asociadas.
- El síncope durante la TVS no predice una tasa de taquicardia más rápida.
- Estos hallazgos sugieren un mecanismo común que involucra la regulación autónoma para la síncope tanto en la SVT como en las respuestas vasovágicas.
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