Time-lapse technology, in the context of assisted reproductive technologies, is used to improve the results of In Vitro Fertilization (IVF) cycles. The main advantage of this method is that it allows us to monitor embryo development with videos fully, while they are still in the incubator. By doing this, it is possible to select the embryos with the highest implantation potential. Some of the most commonly used time-lapse systems today are EmbryoScope and Eeva.
What is time-lapse technology?
Time-lapse is an imaging technique used to create videos using a series of pictures taken at particular time intervals. It allows us to see in greater detail the development that occurs in certain intervals, which take place so slowly that are invisible to the naked eye. Thanks to time-lapse technology, we can see them more rapidly and in full detail.
One of the most remarkable advancements achieved in the past few years in the field of Assisted Reproduction is precisely the use of this technology to monitor embryo development in vitro.
Applied to this context, time-lapse technology takes pictures of embryos at different time intervals (every 10 or 20 minutes, for instance), from different viewpoints. With the pictures obtained, this technology creates videos that allows the embryologist to see the entire development process of each embryo individually or collectively, depending on the case.
In short, thanks to time-lapse technology, today we can see what occurs at each stage of embryo development—from the moment ICSI is carried out until they are transferred, frozen, or thrown away.
Advantages over conventional methods
One of the most important steps of IVF cycles is embryo selection. Being capable of choosing the ones with the highest chance of implanting is a key factor to determine the success rate of a cycle.
To date, embryos were evaluated considering morphological parameters only, that is, the only aspects observed were the shape or appearance of each embryo at a particular moment of the day of development.
Some of the morphological parameters typically examined were size and cell symmetry, number of cells, cleavage rate… More on this story: Embryo Classification.
The main limitation of traditional methods was that the evaluation of embryos was conducted only at particular stages of development. In other words, we gather static information from a dynamic process. Subsequently, we miss material information about the embryo development process.
Furthermore, evaluating the quality of embryos under the conventional microscope is not a recommended practice, as quality diminishes each time the embryos leave the incubator.
Thanks to time-lapse technology, we can monitor embryo development without taking the embryos out of the incubator, thereby maintaining them in ideal culture conditions.
What are morphokinetic parameters of embryos?
The increased use of new technology has lead to the emergence of a vast amount of information about embryo development that was inaccessible using conventional microscopes.
Moreover, time-lapse technology gives us information about the exact times when certain morphological changes occur in the embryo. The application of time measurement to morphological evaluation has lead to the birth of a new field called morphokinetics.
Examples of morphokinetic parameters include, but are not limited to, the exact time when an embryo splits into five cells, or when embryos grow to blastocyst stage.
Most time-lapse monitoring system have an algorithm that is capable of predicting which embryos are more likely to attach to the uterus of the intended mother based on data gathered by the monitoring tool used.
In conclusion, thanks to this non-invasive method for embryo selection, we can select only those embryos that are more likely to lead to a successful pregnancy. This is possible thanks to predictive morphokinetic parameters.
Types of time-lapse monitoring systems
Nowadays, the most common time-lapse monitoring systems available on the market can be classified into two categories:
- Incubators with incorporated image systems: EmbryoScope®, Geri®, Miri®, CCM (Cell Culture Monitoring System).
- Independent image systems included in conventional incubators: Primo Vision™, Eeva™.
Each type has a series of pros and particularities, mainly related to the quality of the image system used, the selection algorithms, or the data it provides.
For example, EmbryoScope is able to provide information about oxygen consumption by embryos, which can help to select the embryos more accurately.
Does it increase IVF success rates?
Having as much information as possible about embryo development allows the embryologist to select them with more precision, boosting the implantation rate per transfer.
A number of studies have focused on determining whether time-lapse monitoring systems actually improve the success rates of reproductive technologies. Indeed, several research studies have proved that this technology increases the pregnancy success rates of IVF.
However, more studies that confirm these results are needed yet. Also, there is an increasing need to determine whether these improvements are due to an optimization of culture conditions, to the use of more accurate embryo selection procedures, or to a combination of both.
There is no doubt, in any case, that time-lapse technology has clear potential to improve IVF success rates, as well as for introducing new expertise in the field of Embryology.
Benefits of time-lapse technology
According to embryologist José Muñoz, time-lapse technology, particularly EmbryoScope, increases the pregnancy success rates based on his experience in the IVF lab.
Especially in the case of patients with high-quality embryos and an elevated number of oocytes, success rates can increase up to 15%. In patients with a poorer prognosis, time-lapse technology improves their outcomes as well, but in these cases, the type of embryo culture used has a greater impact than the selection process used.
Moreover, Muñoz confirms the relevance of image monitoring systems for embryo selection, but at the same time but there is much to be done yet. To date, he and his team have discovered that a multiplication occurs in the embryo at the 2-cell stage that disappears afterwards.
FAQs from users
Is there any difference between the success rates of incubators with a time-lapse system incorporated and independent image systems?
Time-lapse embryo incubators have received much attention since their initial application. However, time-lapse or any imaging system only provides the capability of reviewing the process of embryo development. While it might be able to predict embryo development from the cleavage stage to the blastocyst stage, time-lapse technology has not proven to increase pregnancy success rates over standard IVF incubators.
Can I see the video recording of my embryos?
Yes, once you finish your IVF cycle, your clinic can provide you the DVD with the development of your embryos if you want it. Some labs allow patients to see the development of their embryos live at home.
If you see a poor-quality embryo in a video, do you automatically discard it?
Considering its stage and development stage, the embryologist will determine which one has the highest implantation potential. Even though class C embryos (low quality) have a limited implantation chance, some are able to cause a pregnancy. For this reason, if an embryologist considers that there are chances for it to implant and there are no other embryos of better quality, it will not be discarded but chosen for the transfer.
Will my IVF cycle be more expensive if they use time-lapse technology?
Currently, the main disadvantage of time-lapse technology is that the cost of embryo culture with this system is higher than with conventional methods. For this reason, the cost of IVF may increase if this technology is used. The cost varies from clinic to clinic, though.
Suggested for you
Time-lapse monitoring systems are used for embryo selection during the embryo culture step of the IVF process. Want to learn more about it? Check this out: Embryo Culture Media for Human IVF.
On the other hand, and as we have seen above, there exist several types of time-lapse incubators, but the truth is that EmbryoScope has become very popular nowadays amongst fertility clinics worldwide. Read more: What Is EmbryoScope?
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