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La fibrilación auricular crónica inducida por el ritmo cardíaco deteriora la función del nodo sinusal en perros.
1Krannert Institute of Cardiology, Department of Medicine, Indiana University School of Medicine, Indianapolis, USA.
Circulation
|December 1, 1996
Resumen
La fibrilación auricular crónica inducida por el ritmo (FA) deteriora la función del nodo sinusal y ralentiza la conducción. Estos efectos negativos en las aurículas se invierten gradualmente después de que se detiene la FA.
Área de la Ciencia:
- Cardiología Cardiología.
- Electrofisiología y electrofisiología.
- Las arritmias cardíacas son arritmias cardíacas.
Sus antecedentes:
- La fibrilación auricular crónica (FA) puede afectar significativamente la función cardíaca.
- Comprender las consecuencias electrofisiológicas de la FA inducida es crucial para el manejo de las arritmias.
Objetivo del estudio:
- Para investigar los efectos de la fibrilación auricular crónica inducida por el ritmo (FA) en la función del nodo sinusal.
- Para evaluar los cambios en la conducción intra-atrial y la refractividad auricular durante la FA crónica.
- Para determinar la reversibilidad de estos cambios electrofisiológicos después de la terminación de AF.
Principales métodos:
- Los perros Mongrel se sometieron a un bloqueo nodal AV y a un ritmo VVI.
- La fibrilación auricular (FA) fue inducida en 11 perros a través del ritmo atrial rápido.
- Los parámetros electrofisiológicos, incluido el tiempo de recuperación del nodo sinusal, la duración de la onda P, la frecuencia cardíaca y los períodos refractarios efectivos auriculares (ERP), se midieron al inicio y después de la inducción de AF.
Principales resultados:
- La FA crónica inducida condujo a un tiempo prolongado de recuperación del nodo sinusal corregido y a la duración de la onda P.
- Las frecuencias cardíacas máximas e intrínsecas disminuyeron, mientras que las ERP auriculares se acortaron.
- La duración de la FA aumentó significativamente, lo que indica la perpetuación de la arritmia.
- Estos cambios mostraron una reversión parcial tras la conversión al ritmo sinusal.
Conclusiones:
- La FA crónica inducida por el ritmo provoca disfunción del nodo sinusal y una conducción intra-atrial prolongada.
- La refractividad auricular se acorta, lo que contribuye a la perpetuación de la FA.
- Las anomalías electrofisiológicas asociadas con la FA crónica se resuelven gradualmente después de la terminación de la FA.
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