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Memoria cardíaca en el atrio canino: identificación e implicaciones.
1Department of Pharmacology, College of Physicians and Surgeons of Columbia University, New York, NY 10032, USA.
Circulation
|February 7, 2001
Resumen
La memoria cardíaca se produce en la aurícula canina, se desarrolla rápidamente y se resuelve con el ritmo. Este fenómeno, vinculado a un período refractario más corto, puede promover arritmias auriculares.
Área de la Ciencia:
- Cardiología Cardiología.
- Electrofisiología y electrofisiología.
- Fisiología Cardíaca Fisiología Cardíaca.
Sus antecedentes:
- La memoria cardíaca, un fenómeno previamente observado en el ventrículo, se supone que ocurre en la aurícula.
- La memoria auricular podría desempeñar un papel en la modulación del ritmo cardíaco.
Objetivo del estudio:
- Para investigar la presencia y las características de la memoria cardíaca en la aurícula canina.
- Para determinar el efecto del sitio y la velocidad de ritmo en la memoria auricular.
- Para evaluar la relación entre la memoria auricular y el período refractario efectivo.
Principales métodos:
- Se estudiaron perros conscientes, crónicamente instrumentados con bloqueo cardíaco completo.
- Se realizó un ritmo secuencial atrioventricular desde la aurícula derecha (AR) y el apéndice atrial izquierdo (AIL) a ritmos variables.
- Se analizaron las ondas P y Ta, los vectores de gradiente auricular espacial y los períodos refractarios efectivos.
Principales resultados:
- El ritmo de la LAA, particularmente a ritmos rápidos, alteró las ondas P y Ta, lo que indica la memoria cardíaca.
- El desplazamiento del vector de gradiente atrial espacial durante la recuperación del ritmo de LAA demostró la acumulación y resolución de la memoria.
- Se observó una disminución en el período refractario efectivo derecho simultáneamente con la memoria auricular.
Conclusiones:
- La memoria cardíaca es demostrable en la aurícula canina, caracterizada por un inicio rápido, acumulación y resolución al cesar el ritmo.
- La memoria auricular se asocia con un período refractario efectivo reducido.
- Los hallazgos sugieren que la memoria auricular puede contribuir al sustrato para las arritmias auriculares.
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