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Caracterización de la activación auricular izquierda en el corazón humano intacto
Vias Markides1, Richard J Schilling, Siew Yen Ho
1St Mary's Hospital, Imperial College, London, UK.
Circulation
|February 13, 2003
Resumen
Se mapearon los patrones de activación de la aurícula izquierda (AL) humana durante el ritmo sinusal y la iniciación de la fibrilación auricular (FA). Los hallazgos revelan vías de activación características influenciadas por la arquitectura miocárdica, cruciales para la comprensión y el tratamiento de la FA.
Área de la Ciencia:
- Electrofisiología Cardíaca Electrofisiología cardíaca.
- Arquitectura del miocardio auricular Arquitectura del miocardio auricular
- La arritmogénesis es la arritmogénesis.
Sus antecedentes:
- Los patrones de activación de la aurícula izquierda (AL) y su relación con la arquitectura miocárdica y la arritmogénesis son poco conocidos.
- Comprender estas dinámicas es fundamental para desarrollar tratamientos efectivos para las arritmias auriculares.
Objetivo del estudio:
- Mapear la activación endocárdica LA humana durante el inicio del ritmo sinusal y la fibrilación auricular (FA).
- Para correlacionar los patrones de activación con la arquitectura del miocardio auricular.
- Para aclarar los mecanismos de iniciación de AF en relación con la activación de LA.
Principales métodos:
- Cartografía percutánea sin contacto de la activación endocárdica de LA en 19 pacientes.
- Análisis de la arquitectura miocárdica en 10 corazones después de la muerte.
- Observación del inicio de la FA durante la activación focal y la ectopia de la vena pulmonar (VP).
Principales resultados:
- La ruptura endocárdica LA más temprana durante el ritmo sinusal se produjo predominantemente en la región septal.
- La activación de LA se propaga constantemente alrededor de una línea funcional del bloque de conducción, siguiendo un curso anatómico específico.
- La interacción entre los frentes de onda de origen fotovoltaico y la línea de bloque de conducción durante la iniciación de AF condujo a macroreintroducción o frentes de onda hijas.
Conclusiones:
- La activación endocárdica de LA exhibe patrones complejos pero característicos durante el ritmo sinusal, el ritmo y la iniciación de la FA.
- Estos patrones están dictados principalmente por las propiedades funcionales de la musculatura auricular.
- Los hallazgos ofrecen implicaciones significativas para el ritmo y las estrategias ablativas destinadas a prevenir el inicio de la FA.
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