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Vitamina K1 plasmática en madres y sus recién nacidos
Lancet (London, England)
|August 28, 1982
Resumen
Los niveles plasmáticos de vitamina K1 (filloquinona) son significativamente más bajos en los recién nacidos en comparación con sus madres, lo que indica una mala transferencia placentaria. Este hallazgo sugiere la necesidad de reevaluar la profilaxis de la vitamina K en el período neonatal.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Medicina Neonatal La medicina neonatal es una especialidad de la medicina neonatal.
- Farmacología Farmacología.
Sus antecedentes:
- La vitamina K1 plasmática (filloquinona) es crucial para la coagulación de la sangre.
- La hipoprotrombinemia fisiológica es común en los recién nacidos.
- Las prácticas actuales de profilaxis de la vitamina K pueden requerir una reevaluación.
Objetivo del estudio:
- Para cuantificar los niveles plasmáticos de vitamina K1 en adultos sanos, mujeres embarazadas a término y sus neonatos.
- Para investigar la transferencia placentaria de la vitamina K1.
- Para correlacionar los niveles de vitamina K1 neonatales con la hipoprotrombinemia fisiológica.
Principales métodos:
- Se utilizó cromatografía líquida de alto rendimiento (HPLC) para analizar la vitamina K1 en plasma.
- Se recogieron muestras de plasma de adultos en ayunas, mujeres embarazadas a término y sus neonatos.
- Los niveles maternos de vitamina K1 fueron suplementados por vía intravenosa antes del parto en un subconjunto de participantes.
Principales resultados:
- La media plasmática de vitamina K1 en adultos fue de 0,26 ng/ml.
- El K1 plasmático materno a término tenía un promedio de 0.20 ng/ml, con niveles indetectables en la mayoría de los recién nacidos.
- La suplementación intravenosa materna de vitamina K1 aumentó significativamente los niveles maternos, pero resultó en una transferencia mínima a los neonatos.
Conclusiones:
- La vitamina K1 no cruza fácilmente la placenta, o la absorción fetal es limitada.
- Los bajos niveles neonatales de vitamina K1 probablemente explican la hipoprotrombinemia fisiológica.
- Las estrategias actuales de profilaxis de vitamina K para recién nacidos pueden necesitar una reevaluación.
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