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| ID | Type | Description | Link |
|---|---|---|---|
| CCMO NL23499.000.08 | |||
| METC 08/183 |
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| Name | Class |
|---|---|
| Vrije Universiteit Brussel | OTHER |
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Human embryos can be preserved for later transfers by freezing. Traditionally the slow cooling method has been used. About 70% of the embryos remain fully intact after thawing. However, the remaining 30% of the embryos become (partially) damaged, and this freezing damage reduces their chance to implant. Recently an ultra rapid freezing method, called vitrification has been developed. During vitrification no damaging ice crystals are formed and the embryo freezes in a glass like state.
It appears that the freezing damage is reduced when embryos are vitrified. Observational studies in humans indicate that embryos are successfully preserved by vitrification, as indicated by promising pregnancy rates following thawing. However, the effectiveness of vitrification in relation to slow cooling with respect to pregnancy rates has so far not been evaluated by a randomised, controlled trial. The aim of this study is to investigate whether vitrification significantly improves embryo survival and ongoing pregnancy rates when compared to embryos frozen by slow cooling.
time of allocation: following embryo selection
type of embryos: cleavage stage -, morula stage or early blastocyst stage embryo (day3 - day4 after oocyte collection)
cryoprotectants: sucrose, dimethylsulfoxide, ethyleneglycol
vitrification storage device: high security vitrification straws
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Vitrification | Experimental | The embryos of patients allocated to this arm will be cryopreserved by vitrification. |
|
| Slow cooling | No Intervention | The embryos of patients allocated to this arm will be cryopreserved by the slow cooling method, which is the standard method (=no intervention) |
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| embryo vitrification | Other | Ultra rapid cooling of embryos by immersion in liquid nitrogen. The formation of potentially damaging ice crystals is prevented by briefly incubating the embryos in high concentrations of a mix of cryoprotectants. |
| Measure | Description | Time Frame |
|---|---|---|
| The percent change of the ongoing pregnancy rate per patient/couple who use their thawed embryos (following a fesh embryo transfer which did not result in an ongoing pregnancy) from baseline (slow cooling) to end point (vitrification). | ongoing pregnancy is established 10 weeks following the transfer of a frozen embryo |
| Measure | Description | Time Frame |
|---|---|---|
| post-thaw embryo survival rate | 1 hour after thawing | |
| ongoing pregnancy rate per patient using their thawed embryos (independent of whether they became pregnant following a fresh embryo transfer or not | 10 weeks following transfer of frozen thawed embryo |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Bart C Fauser, Prof.,MD,PhD | UMC Utrecht | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Academic Hospital of Brussels | Brussels | 1090 | Belgium | |||
| University Medical Center of Utrecht |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 16541460 | Background | Boonkusol D, Gal AB, Bodo S, Gorhony B, Kitiyanant Y, Dinnyes A. Gene expression profiles and in vitro development following vitrification of pronuclear and 8-cell stage mouse embryos. Mol Reprod Dev. 2006 Jun;73(6):700-8. doi: 10.1002/mrd.20450. | |
| 10519629 | Background | Burns WN, Gaudet TW, Martin MB, Leal YR, Schoen H, Eddy CA, Schenken RS. Survival of cryopreservation and thawing with all blastomeres intact identifies multicell embryos with superior frozen embryo transfer outcome. Fertil Steril. 1999 Sep;72(3):527-32. doi: 10.1016/s0015-0282(99)00280-0. |
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| ID | Term |
|---|---|
| D007246 | Infertility |
| ID | Term |
|---|---|
| D000091662 | Genital Diseases |
| D000091642 | Urogenital Diseases |
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| ID | Term |
|---|---|
| D058989 | Vitrification |
| ID | Term |
|---|---|
| D044367 | Phase Transition |
| D055585 | Physical Phenomena |
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| implantation rate per thawed embryo | 10 weeks after transfer of thawed embryo |
| implantation rate per transferred thawed embryo | 10 weeks after transfer of thawed embryo |
| cumulative implantation rate per cryopreservation | 10 weeks after thawed embryo transfer |
| ongoing pregnancy rate per frozen-thaw cycle | 10 weeks following thawed embryo transfer |
| average number of frozen-thawed cycles per patient | is variable |
| post thaw development (categorial) per thawed embryo | 24 hours following thawing |
| average number of cryo-thaw cycles to ongoing pregnancy | variable, up to 3 years |
| average number of thawed embryos to ongoing implantation | variable, up to 3 years |
| Life birth rate | 9 month after pregnancy test |
| Utrecht |
| Utrecht |
| 3584 CX |
| Netherlands |
| 17298725 | Background | Desai N, Blackmon H, Szeptycki J, Goldfarb J. Cryoloop vitrification of human day 3 cleavage-stage embryos: post-vitrification development, pregnancy outcomes and live births. Reprod Biomed Online. 2007 Feb;14(2):208-13. doi: 10.1016/s1472-6483(10)60789-4. |
| 10611209 | Background | Edgar DH, Bourne H, Speirs AL, McBain JC. A quantitative analysis of the impact of cryopreservation on the implantation potential of human early cleavage stage embryos. Hum Reprod. 2000 Jan;15(1):175-9. doi: 10.1093/humrep/15.1.175. |
| 15333245 | Background | Kasai M, Mukaida T. Cryopreservation of animal and human embryos by vitrification. Reprod Biomed Online. 2004 Aug;9(2):164-70. doi: 10.1016/s1472-6483(10)62125-6. |
| 11532492 | Background | Mukaida T, Nakamura S, Tomiyama T, Wada S, Kasai M, Takahashi K. Successful birth after transfer of vitrified human blastocysts with use of a cryoloop containerless technique. Fertil Steril. 2001 Sep;76(3):618-20. doi: 10.1016/s0015-0282(01)01968-9. |
| 16274602 | Background | Rama Raju GA, Haranath GB, Krishna KM, Prakash GJ, Madan K. Vitrification of human 8-cell embryos, a modified protocol for better pregnancy rates. Reprod Biomed Online. 2005 Oct;11(4):434-7. doi: 10.1016/s1472-6483(10)61135-2. |
| 16684837 | Background | Salumets A, Suikkari AM, Makinen S, Karro H, Roos A, Tuuri T. Frozen embryo transfers: implications of clinical and embryological factors on the pregnancy outcome. Hum Reprod. 2006 Sep;21(9):2368-74. doi: 10.1093/humrep/del151. Epub 2006 May 9. |
| 16950825 | Background | Sheehan CB, Lane M, Gardner DK. The CryoLoop facilitates re-vitrification of embryos at four successive stages of development without impairing embryo growth. Hum Reprod. 2006 Nov;21(11):2978-84. doi: 10.1093/humrep/del253. Epub 2006 Sep 1. |
| 16102287 | Background | Stehlik E, Stehlik J, Katayama KP, Kuwayama M, Jambor V, Brohammer R, Kato O. Vitrification demonstrates significant improvement versus slow freezing of human blastocysts. Reprod Biomed Online. 2005 Jul;11(1):53-7. doi: 10.1016/s1472-6483(10)61298-9. |
| 16009162 | Background | Takahashi K, Mukaida T, Goto T, Oka C. Perinatal outcome of blastocyst transfer with vitrification using cryoloop: a 4-year follow-up study. Fertil Steril. 2005 Jul;84(1):88-92. doi: 10.1016/j.fertnstert.2004.12.051. |
| 17359578 | Background | Al-Hasani S, Ozmen B, Koutlaki N, Schoepper B, Diedrich K, Schultze-Mosgau A. Three years of routine vitrification of human zygotes: is it still fair to advocate slow-rate freezing? Reprod Biomed Online. 2007 Mar;14(3):288-93. doi: 10.1016/s1472-6483(10)60869-3. |
| 16762345 | Background | Liebermann J, Tucker MJ. Comparison of vitrification and conventional cryopreservation of day 5 and day 6 blastocysts during clinical application. Fertil Steril. 2006 Jul;86(1):20-6. doi: 10.1016/j.fertnstert.2006.01.029. Epub 2006 Jun 8. |
| 11334922 | Background | Yokota Y, Sato S, Yokota M, Yokota H, Araki Y. Birth of a healthy baby following vitrification of human blastocysts. Fertil Steril. 2001 May;75(5):1027-9. doi: 10.1016/s0015-0282(01)01685-5. |