Time-lapse Evaluation of Human Embryo Development in Single Versus Sequential Culture Media - a Sibling Oocyte Study

NCT ID: NCT01507883

Last Updated: 2012-01-11

Basic Information

• Recruitment Status: UNKNOWN
• Total Enrollment: 50 participants
• Study Classification: OBSERVATIONAL
• Study Start Date: 2011-03-31
• Study Completion Date: 2012-01-31

Brief Summary

Current human IVF technology employs two strategies with respective culture media for embryo development; 'let the embryo choose' (utilizes single step media) and 'back-to-nature' (utilizes sequential media). To our knowledge, there is not any sibling oocyte study to evaluate potential advantages/disadvantages of these strategies on one another.

Detailed Description

Maintaining optimal embryo development during in vitro culture is a key element in assisted reproduction treatments. Whether the concept of mimicking in vivo environment is a 'must' in order not to compromise outcome is a matter of debate since 'let the embryo choose' strategy has been shown to perform at least as good as the 'back to nature' in several studies.'Let the embryo choose" approach utilizes a milieu with relatively constant concentration of ingredients (single culture system) as compared to the latter, in which demands of the embryos are supported according to their passage from the Fallopian tubes to the uterus in a sequential culture media. Basic differences between these ingredients are; presence of (1) glucose instead of pyruvate, and (2) essential aminoacids in early embryo stages (until day 3) in single step media, and (3) presence of EDTA in sequential media.

Vast majority of these results were obtained from studies where patients have been randomized into groups instead of employing a sibling (oocyte/embryo) model which could have enabled each patient to serve as her own control. In fact, it has been claimed that introducing a sibling oocyte study design could give a methodological problem at the time of fertilization since different type of culture media vary in osmolarity. Likewise the only study that employed a sibling oocyte model utilized two different media (home-made versus G1.2/G1.2) although the osmolarity of the former had been adjusted to 280-285 mOsm). This study reported no significant differences in day3/5 embryo development as well as pregnancy/implantation rates between groups.

Subsequent studies, however, favoured single step media, as they found higher proportion of compacted embryos to zygotes at day3, morula at 4, a higher blastocyst yield, an overall higher utilization rate after day5 and an improved implantation rate when compared to sequential media. Yet, besides potential variation of gamete qualities between patients allocated to groups (as described above), differences in static observation times of embryos between laboratories could have affected the results in these studies. Current introduction of time-lapse equipment into human assisted reproduction technology enabled a more distinct definition of embryo development and it is now possible to quantify pace of embryo cleavage in various media. Such a definition is also useful to determine the predictive value of embryo development in pre-defined time points will be applicable to all embryology laboratories using various culture systems.

Conditions

In-vitro Fertilization

Study Design

• Observational Model Type: CASE_CONTROL
• Study Time Perspective: PROSPECTIVE

Study Groups

human oocytes/embryos

Sibling oocytes cultured in single or sequential media until day6

No interventions assigned to this group

Eligibility Criteria

Inclusion Criteria

• Cycles which have gone through egg retrieval procedure between March to November 2011 were included into the study.There was no restriction on the number of previous trials and/or sperm source.

Exclusion Criteria

• The maximum number of retrieved oocytes was restricted to 12 and the minimum to 2, as the former was the capacity of one dish (EmbryoSlide™) in which oocytes/embryos could be placed and the latter was the minimum number to be able to make a comparison between groups. Women who were older than 40 years of age were excluded in order to minimize the impact of increased risk of aneuploidy on the results.
• Cycles in which oocytes/embryos have been subjected to biopsy were also excluded due to the potential risk of delayed embryo development in such cases (Kirkegaard et al., 2011).
• Furthermore, cycles in which diagnosis of infertility was endometrial factor were not included since such aetiology could negatively affect implantation despite good embryo development.

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 39 Years
• Eligible Sex: FEMALE
• Accepts Healthy Volunteers: No

Sponsors

Bahceci Health Group

OTHER

Sponsor Role: lead

Responsible Party

H. NADIR CIRAY

Associate Professor, MD., PhD

Responsibility Role: PRINCIPAL_INVESTIGATOR

Principal Investigators

Nadir H Ciray, MD., PhD

Role: PRINCIPAL_INVESTIGATOR

Bahceci Health Group

Turan Aksoy, BS

Role: STUDY_CHAIR

Bahceci Health Group

Mustafa Bahceci, MD

Role: STUDY_DIRECTOR

Bahceci Health Group

Cihan Goktas, BS

Role: STUDY_CHAIR

Bahceci Health Group

Birgen Ozturk, BS

Role: STUDY_CHAIR

Bahceci Health Group

Locations

Bahceci Fulya IVF Clinic

Istanbul, , Turkey (Türkiye)

Site Status: RECRUITING

Countries

Turkey (Türkiye)

Facility Contacts

Nadir Ciray, MD., PhD

Role: primary

+90 2123103100

Other Identifiers

BHC1

Identifier Type: -

Identifier Source: org_study_id