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  • Title: Prospective randomized comparison of human oocyte cryopreservation with slow-rate freezing or vitrification.
    Author: Smith GD, Serafini PC, Fioravanti J, Yadid I, Coslovsky M, Hassun P, Alegretti JR, Motta EL.
    Journal: Fertil Steril; 2010 Nov; 94(6):2088-95. PubMed ID: 20171613.
    Abstract:
    OBJECTIVE: To compare cryopreservation of mature human oocytes with slow-rate freezing and vitrification and determine which is most efficient at establishing a pregnancy. DESIGN: Prospective randomized. SETTING: Academically affiliated, private fertility center. PATIENT(S): Consenting patients with concerns about embryo cryopreservation and more than nine mature oocytes at retrieval were randomized to slow-rate freezing or vitrification of supernumerary (more than nine) oocytes. INTERVENTION(S): Oocytes were frozen or vitrified, and upon request oocytes were thawed or warmed, respectively. MAIN OUTCOME MEASURE(S): Oocyte survival, fertilization, embryo development, and clinical pregnancy. RESULT(S): Patient use has resulted in 30 thaws and 48 warmings. Women's age at time of cryopreservation was similar. Oocyte survival was significantly higher following vitrification/warming (81%) compared with freezing/thawing (67%). Fertilization was more successful in oocytes vitrified/warmed compared with frozen/thawed. Fertilized oocytes from vitrification/warming had significantly better cleavage rates (84%) compared with freezing/thawing (71%) and resulted in embryos with significantly better morphology. Although similar numbers of embryos were transferred, embryos resulting from vitrified oocytes had significantly enhanced clinical (38%) pregnancy rates compared with embryos resulting from frozen oocyte (13%). Miscarriage and/or spontaneous abortion rates were similar. CONCLUSION(S): Our results suggest that vitrification/warming is currently the most efficient means of oocyte cryopreservation in relation to subsequent success in establishing pregnancy.
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