cryopreservation

What happens to excess embryos following assisted reproduction treatment?

When in vitro fertilisation treatment commences, one of the aims is to try and achieve an appropriate number of good quality embryos in the laboratory so that the best ones can be selected and transferred. Whilst the Spanish law on assisted reproduction (Law 14/2006) permits transfer of a maximum of 3 embryos per cycle, progress in techniques has meant that […]

2019-03-08T10:01:34+02:008 de March de 2019|0 Comments

The advantages and disadvantages of transferring embryos during a natural or artificial cycle

Embryo transfer to the uterus is the pinnacle of all courses of assisted reproduction treatment. It cannot be left to chance. The endometrium needs to be receptive and facilitate embryo embedding.
The endometrium can be prepared with the aid of drugs (oestrogens) to simulate natural uterine behaviour – a substituted or artificial cycle – or transfer can be carried out whenever biologically most appropriate following ovulation – transfer during a natural cycle. […]

2018-03-28T12:54:41+02:0029 de March de 2018|0 Comments

The ethical issues faced in assisted reproduction clinics

Although Spanish law led the way in regulating the practice of assisted reproduction and made significant progress in comparison with legislation in neighbouring countries, and even though Spain is, furthermore, a leader in the field both in terms of the quality of some of its clinics and health specialists, as well as in terms of the excellent results obtained, it […]

2018-06-21T13:24:56+02:0015 de September de 2017|0 Comments

Will my frozen embryos survive?

Cryopreservation, or embryo freezing, is an essential part of courses of assisted reproduction treatment since it means that embryos can be preserved in order to be used at a later date and without the passing of time having a negative impact on their viability.
Embryos obtained as a result of in vitro fertilisation (IVF) may be thawed for a number of reasons: […]

2017-02-08T14:57:37+02:009 de February de 2017|0 Comments

Vitrification: the cold revolution

Vitrification is generally associated with delaying maternity. It involves preserving eggs at low temperatures so that they may be used in the future. This is, in itself, astounding since it enables gametes to be preserved by means of advanced and ultra-rapid cell freezing so that they may be used sometime in the future. The uses to which this technique may be put are so varied and numerous and have changed the work environment in the most prestigious of fertility clinics to such an extent that experts have no doubts about referring to vitrification as a ‘revolutionary’ procedure.
“We could say that cryopreservation is currently the most important aspect of any assisted reproduction clinic” assures Dr Jorge Ten, head of the Reproductive Biology Operational Unit at Instituto Bernabeu in Alicante. In the words of this expert, this technique “has changed enormously over the last 6 to 8 years”. Vitrification was initially carried out using “slow freezing techniques which caused cell damage” in the oocyte. This cell, “in the case of women, is the largest in the human body and has the greatest content in water. Therefore, when frozen, it produced poorer results due to the formation of ice crystals which damaged its structure”. The ice crystals which formed as a result of the aforementioned slow freezing and the high water content in the cell meant that survival rates were “between 20 and 30%. Almost no oocytes survived”. […]

2016-08-04T13:54:31+02:0028 de October de 2015|0 Comments
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