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Disminución inducida por la heparina en la antitrombina-III circulante
Lancet (London, England)
|September 17, 1977
Resumen
El tratamiento continuo con heparina agota significativamente la antitrombina III (AT-III) en plasma, un inhibidor clave de la proteinasa. Esta reducción puede explicar las complicaciones tromboembólicas observadas durante el tratamiento a largo plazo con heparina.
Área de la Ciencia:
- Farmacología Farmacología.
- Hematología Hematología.
- La bioquímica es la bioquímica.
Sus antecedentes:
- La antitrombina-III (AT-III) es un inhibidor crucial de la proteinasa responsable del efecto anticoagulante de la heparina.
- Comprender los niveles de AT-III es vital para interpretar los datos clínicos durante la terapia con heparina.
Objetivo del estudio:
- Para investigar el impacto de la infusión continua intravenosa de heparina en las concentraciones plasmáticas de antitrombina-III (AT-III).
- Para determinar si la exposición prolongada a la heparina afecta los niveles de AT-III y su capacidad de unión.
Principales métodos:
- Las concentraciones plasmáticas de AT-III se midieron en 26 pacientes sometidos a terapia con heparina (24 perfusiones continuas, 2 inyecciones repetidas).
- La capacidad de unión AT-III y los niveles de proteínas antigénicas se evaluaron a lo largo del tratamiento.
- Los niveles de AT-III fueron monitoreados después del cese de la heparina.
Principales resultados:
- El tratamiento con heparina, particularmente la infusión continua, causó una reducción progresiva en los niveles plasmáticos de AT-III.
- La disminución de AT-III se observó incluso en un paciente con deficiencia congénita de AT-III.
- Los niveles plasmáticos de AT-III volvieron a la normalidad dentro de los 2-3 días después de suspender el tratamiento con heparina.
- Las dosis únicas de heparina no dieron lugar a una disminución significativa en AT-III.
Conclusiones:
- La administración prolongada de heparina agota significativamente el AT-III, lo que afecta su función de inhibidor de la proteinasa.
- La depleción de AT-III durante el tratamiento con heparina puede contribuir a la aparición de complicaciones tromboembólicas.
- Estos hallazgos son clínicamente relevantes para el manejo de pacientes en terapia con heparina.
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