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Deterioro de la vasodilatación dependiente del endotelio de los vasos de resistencia del antebrazo en la
P J Chowienczyk1, G F Watts, J R Cockcroft
1Department of Clinical Pharmacology, St Thomas' Hospital, London, UK.
Lancet (London, England)
|December 12, 1992
Resumen
El colesterol alto perjudica la función de los vasos sanguíneos más allá del corazón. Este estudio encontró disfunción endotelial generalizada en la hipercolesterolemia, que afecta a los vasos del antebrazo y sugiere un defecto molecular específico.
Área de la Ciencia:
- Fisiología cardiovascular fisiología cardiovascular.
- Biología Vascular Biología Vascular
- Trastornos metabólicos Los trastornos metabólicos son trastornos metabólicos que se producen en el cuerpo.
Sus antecedentes:
- La vasodilatación dependiente del endotelio es crucial para la salud vascular.
- La hipercolesterolemia está relacionada con la disfunción endotelial, particularmente en la circulación coronaria.
- Se debate la extensión de la disfunción endotelial en otros lechos vasculares en la hipercolesterolemia.
Objetivo del estudio:
- Para investigar las respuestas vasodilatadoras en los vasos de resistencia del antebrazo de individuos con hipercolesterolemia.
- Para comparar las respuestas a la acetilcolina, metacolina y nitroprussida de sodio entre sujetos con hipercolesterolemia y normocolesterolemia.
- Para determinar si la disfunción endotelial en la hipercolesterolemia es generalizada.
Principales métodos:
- Reclutamiento de 12 hombres con hipercolesterolemia primaria y 12 controles normocolesterolemicos.
- Evaluación de las respuestas vasodilatadoras del antebrazo utilizando acetilcolina, metacolina y nitroprussida de sodio.
- La medición de los cambios en el flujo sanguíneo en respuesta al aumento de las dosis de vasodilatadores.
Principales resultados:
- La vasodilatación dependiente del endotelio a la acetilcolina se vio significativamente afectada en sujetos con hipercolesterolemia.
- No se observaron diferencias significativas en las respuestas al vasodilatador endotélico-independiente nitroprussida de sodio.
- Las respuestas a la metacolina, otro vasodilatador dependiente del endotelio, no fueron significativamente diferentes entre los grupos.
Conclusiones:
- La disfunción endotelial en la hipercolesterolemia es generalizada y no se limita a la circulación coronaria.
- El deterioro selectivo de la respuesta a la acetilcolina sugiere un defecto molecular específico dentro de la vía endotelial.
- Los hallazgos destacan el impacto generalizado de la hipercolesterolemia en la función vascular.
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