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Hechos y artefactos sobre la anemia y el parto prematuro
M A Klebanoff1, P H Shiono, H W Berendes
1Prevention Research Program, National Institute of Child Health and Human Development, Bethesda, MD 20892.
JAMA
|July 28, 1989
Resumen
La anemia durante el embarazo muestra un débil vínculo con el parto prematuro, especialmente a principios del tercer trimestre. Este estudio encontró que la anemia no es una causa primaria de parto prematuro.
Área de la Ciencia:
- Obstetricia y Ginecología.
- La medicina materno-fetal es una de ellas.
- Hematología Hematología.
Sus antecedentes:
- La anemia es una condición común en el embarazo.
- Su papel en el parto prematuro, particularmente en diversas poblaciones, requiere una mayor investigación.
Objetivo del estudio:
- Examinar prospectivamente la asociación entre la anemia y el parto prematuro.
- Investigar si la anemia contribuye a las altas tasas de nacimientos prematuros observadas en las mujeres negras.
Principales métodos:
- Un estudio prospectivo de 35.423 embarazos.
- Comparación de la incidencia de partos prematuros entre mujeres anémicas y no anémicas semanalmente durante el tercer trimestre.
- Análisis de los cambios en el hematocrito desde las 25 semanas de gestación hasta el término en relación con el peso al nacer y la raza materna.
Principales resultados:
- Se encontró una débil asociación entre la anemia a principios del tercer trimestre y el parto prematuro.
- La anemia temprana en la gestación no explicó el aumento de la tasa de nacimientos prematuros entre las mujeres negras.
- La anemia después de 30 semanas de gestación no se relacionó con el parto prematuro.
- Los niveles de hematocrito aumentaron desde las 25 semanas hasta el término en mujeres negras y blancas que dieron a luz a término.
- La asociación entre la anemia y el parto prematuro parecía más fuerte a las 28 semanas y disminuía a medida que se acercaba el término.
- La comparación de los niveles de hematocrito entre las mujeres en trabajo de parto prematuro y a término creó un falso efecto dosis-respuesta.
Conclusiones:
- La anemia no es un factor significativo en el desarrollo del parto prematuro.
- Problemas metodológicos, como la comparación de hematocritos en mujeres en trabajo de parto, pueden sesgar los resultados.
- Investigaciones adicionales deberían tener en cuenta estos sesgos al evaluar el impacto de la anemia en los resultados del embarazo.
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