Transfer of vitrified embryos
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WHAT IS THE TRANSFER OF VITRIFIED EMBRYOS?
The transfer of vitrified embryos is to use the embryos created in a previous cycle of In Vitro Fertilization, which in his time were vitrified. For them, it will only be necessary the preparation of the endometrium of the woman to be receptive to implantation.
WHEN IS NECESSARY A TRANSFER OF VITRIFIED EMBRYOS?
We use the transfer of frozen embryos in different situations. The most common are:
Women or couples who have already had a child and want to have a second child with the embryos that criopreserved in the first cycle.
Women or couples after the first failed transfer quieren volver a intentarlo.
When the fresh transfer has had to be cancelada y diferida por distintas razones as bad endometrial preparation, pending the results of the PGD (preimplantation genetic diagnosis), etc.
Couples with several implantation failures on fresh transfers sensing that the cause is endometrial.
ENDOMETRIAL PREPARATION AND TRANSFER OF EMBRYOS
Step 1
Endometrial preparation
The woman starts the treatment that consists in the administration of estrogen, orally or in patches. In addition, about 3-5 days before the embryo transfer, should be administered progesterone, either in gel or a soft capsule.
Step 2
Track ultrasound
During this period, the woman performs one or two ultrasounds for the specialist to check the state of the endometrium. When the endometrium is receptive, meaning it has a look trilaminar and a measure of between 7 and 10 mm of thickness approximately, we program the day of the transfer and mark the pattern of administration of progesterone.
Step 3
Devitrification of embryos
The process of devitrification of embryos is quick and simple, since it is only necessary to take the straw with the embryos from liquid nitrogen and place it directly in a medium at 37 °C. Then, pass the embryos by different means of decreasing concentration of cryoprotective for rehydration.
Step 4
Embryo transfer
The embryo transfer is a fast, simple and painless process which can be done in the consultation itself or in the operating room and requires no anesthesia. The specialist inserts a cannula inside with the embryo or embryos, which introduces with a special delicacy in the uterus of the woman.
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