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instalaciones-tambre-9.1 Support Group

Fertility Support Group
This clinic is part of the Fertility Support Group Program.

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Is IVF with frozen eggs better than IVF with fresh eggs?
By Álvaro Martínez Moro . Last Update: 05/07/2021

Egg freezing and vitrification are techniques used to preserve eggs for an indeterminate period of time. Until relatively recently, slow freezing was the most commonly used technique, but it has now been replaced by vitrification.

Vitrification and devitrification procedures are standardised processes that allow the risks of survival of both oocytes and embryos to be reduced to a minimum. Although it is true that, as with all assisted reproduction techniques, there are associated risks, reduced to around 3% both in terms of survival and in terms of a decrease in the potential success of the embryos. It is important to bear in mind that the survival of the embryos may be affected by poor handling or acceptance of the oocytes to the cryoprotectants, which may result in the oocytes not being able to survive the technique.

The decrease in survival will be associated with starting the microinjection process with fewer oocytes than those previously vitrified, but those that are able to evolve have gestational success rates similar to those of fresh oocytes.

Apart from the oocyte quality, the usefulness of vitrified oocytes, especially from donors, lies in the possibility of better coordination of the cycle and even the possibility of carrying out the transfer in fresh and natural cycle.

In any case, what is really important is the achievement of a full-term pregnancy, regardless of the fresh or frozen origin of the gametes or embryos.

Do pesticides negatively affect sperm quality?
By Álvaro Martínez Moro . Last Update: 01/12/2021

Fifty percent of couples who come to assisted reproduction centers have a diagnosis of male infertility, which can be associated with different pathologies, but the most common is seminal quality.

The reasons that affect seminal quality are the age of the male, lifestyle and various pollutants. In the case of pollutants, where we could include pesticides, they involve a toxicity through which these compounds act as hormone disruptors, and can alter both the production of fertility hormones (testosterone, LH, FSH...) and the state of oxidation-reduction that could lead to affectations in terms of concentration, mobility or even DNA. It is important not to automatically associate the use of pesticides with infertility, since the effects would be due to continuous exposure to the appropriate toxicants.

Therefore, we should be aware of the importance of the male in reproductive processes and try to avoid exposure to contaminants that may alter sperm production.

Is semen analysis and advanced semen analysis the same?
By Álvaro Martínez Moro . Last Update: 06/12/2020

No. The motile sperm count test or advanced semen analysis report is a complementary test to a basis semen analysis that is carried out to confirm the parameters evaluated in the latter. Therefore, the advanced seminogram provides more clinical information.

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Do devitrified embryos have a high survival rate?
By Álvaro Martínez Moro . Last Update: 04/22/2020

The survival rate of the devitrified embryos depends on both the viability of the embryo and tolerance to the process, as well as on compliance with the procedures established in the protocols. Therefore, in order to analyze the survival rate, we must understand what vitrification is.

Furthermore, it should be noted that the success of embryo devitrification does not lie in the survival rate of the embryos after the process. What is really important is to achieve results similar to those achieved when using fresh embryos.

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What are the indicators of good egg quality?
By Álvaro Martínez Moro . Last Update: 04/16/2020

Egg quality is one of the most important and probably least known aspects of assisted reproduction. Finding a morphologically normal egg does not guarantee the subsequent achievement of pregnancy, but it does allow the prediction of a high percentage of the embryonic evolution, always taking into account other aspects such as age or ovarian reserve. Thus, we can distinguish three types of indicators, gynecological, morphological, and embryonic.

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Can a period of abstinence influence sperm motility?
By Álvaro Martínez Moro . Last Update: 04/15/2020

The male factor has become one of the most relevant aspects of assisted reproduction recently. Different genetic diagnostic techniques have been used to analyze the role that the male is playing in achieving a pregnancy.

The period of abstinence is an aspect that has varied over the years, thinking at first that the greater the abstinence, the better the result of both the seminal diagnosis and the embryonic evolution and term pregnancy. Some studies show that a period of frequent ejaculations after a period of abstinence can improve sperm quality.

The period of abstinence differs according to the assisted reproduction unit attended and the standardization of the processes. The recommendations of the World Health Organization is to have sexual abstinence of between 2-7 days. If the abstinence is less than two days, we will find spermatozoa that possibly have less DNA fragmentation, but the count of the number of spermatozoa is lower than in normal conditions. If we have a high abstinence period, it is likely that we will find reduced sperm motility.

In conclusion, it is important to have an optimal period of abstinence according to the recommendations of the assisted reproduction center in order to maximize the chances of success in each case.