At the present time, the sperms and the embryos can be conserved several months, even several years without losing intrinsic force, freezing them to temperatures of 196º Celsius under zero. Through this freezing process, the cells are introduced in a special liquid; and with the help of an on-line apparatus the temperature gradually descends until arriving to 196º Celsius under zero. For the storage liquid nitrogen is used, and they stay the cells in a special tank.
The sperms and embryos cannot only be conserved of this way during years, but decades, without losing quality some.
The freezing process, the same as the process of unfreezing, implies an enormous stress for the cells. For this reason is understandable that not all the cells survive in the cryopreservation process.
The Treatment of the Infertility and their Risks
The hormonal stimulation requires of a strict medical control. Each patient reacts from a different way to a dose of the medication. In occasions, it can happen a hyperstimulation (exaggerated growth of the ovaries and of the follicles). In some of these cases, a hospitalization can be necessary; especially during the beginning of a pregnancy. Usually, with the appropriate treatment, the hyperstimulation gives in a few days. Occasionally, a cycle of hormonal stimulation should be canceled due to the hyperstimulation or for answer lack in the patient.
It is considered of very low risk the puncture of the follicles under ultra sonographic control. In very few cases you can end up hurting the intestine or a sanguine glass.
In all the methods in that the hormonal stimulation is used, it increases the risk that it happens a multiple pregnancy. In IVF you can control the risk of multiple pregnancies diminishing the quantity of embryos to arrive on the whole to a decision in case doubts exist.
In comparison with patient of the normal population, the risk for abortions is lightly bigger in patient with infertility problems. The patient's age average with problems of fertility is bigger in comparison with patient of the normal population that are embarrassed.
The risk in the baby's health that is born after a treatment with technical of Attended Reproduction is not altered: it is similar to the risk that all the parents have to accept in all pregnancies.
