Para mujeres mayores de 40 años sometidas a fertilización in vitro (FIV), cinco embriones es el número óptimo de transferencia, según un estudio del Brigham and Women’s Hospital Center For Reproductive Medicine, de Boston (Estados Unidos), publicado por la revista “Fertility and Sterility”.
La Society for Assisted Reproductive Technology (SART) recomienda habitualmente que no se transfieran más de cinco embriones a mujeres mayores de 40. En este sentido, los autores evaluaron y compararon los resultados de la transferencia de uno a 11 embriones en un grupo de mujeres de esa edad.
Específicamente, se hicieron transferencias a un total de 863 mujeres; 142 recibieron exactamente cinco embriones; 392, menos de cinco; y 329 más de cinco.
En el grupo de mujeres de menos de cinco embriones transferidos, el índice de embarazos fue del 19% y el de niños nacidos vivos del 4%. Con cinco embriones, el índice de embarazos fue del 40% y de nacidos vivos del 23%. Con más de cinco embriones, el índice de embarazos alcanzó el 47% y el de nacidos vivos el 22%; pero aumentaron en este grupo los embarazos múltiples.
Los embarazos de trillizos presentaron un alto riesgo de malos resultados finales y el de mellizos, de parto prematuro. Además, las mujeres diabéticas de más de 40 años, embarazadas de mellizos, tuvieron gestaciones muy complicadas.
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Fertility and Sterility
Brigham and Women’s Hospital Center For Reproductive Medicine
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