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El efecto de la nitroglicerina en la distensibilidad arterial del antebrazo
Circulation
|June 1, 1986
Resumen
La nitroglicerina mejora la distensibilidad arterial, reduciendo la carga posterior del ventrículo izquierdo. Este estudio midió los cambios en la distensibilidad del volumen arterial del antebrazo durante la infusión de nitroglicerina para confirmar este efecto.
Área de la Ciencia:
- Fisiología cardiovascular fisiología cardiovascular.
- Farmacología Farmacología.
Sus antecedentes:
- La nitroglicerina reduce el trabajo del ventrículo izquierdo al disminuir la impedancia arterial.
- La reducción de la impedancia arterial está relacionada con la resistencia vascular sistémica y la distensibilidad arterial.
Objetivo del estudio:
- Para cuantificar el efecto de la nitroglicerina en la distensibilidad del volumen arterial del antebrazo.
- Para aclarar el papel de la distensibilidad arterial en el mecanismo de reducción de la carga posterior de la nitroglicerina.
Principales métodos:
- Cálculo de la distensibilidad del volumen arterial del antebrazo utilizando mediciones de la velocidad de las ondas de pulso.
- Se administra una infusión de nitroglicerina por vía intravenosa.
- Se controlaron los cambios en la distensibilidad inducidos por la presión arterial mediante el uso de un cilindro de plástico y presiones variadas.
Principales resultados:
- La infusión de nitroglicerina aumentó consistentemente la distensibilidad arterial del antebrazo en todas las presiones probadas.
- Esto demuestra un mecanismo adicional por el cual la nitroglicerina reduce la carga posterior del ventrículo izquierdo.
Conclusiones:
- La nitroglicerina aumenta la distensibilidad arterial, lo que contribuye a reducir la carga cardíaca posterior.
- El impacto de este efecto específico en la función cardíaca en general es probablemente menor debido al componente de trabajo pulsátil.
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