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  • Title: Effect of reduced oocyte aging on the outcome of rescue intracytoplasmic sperm injection.
    Author: Nagy ZP, Rienzi LF, Ubaldi FM, Greco E, Massey JB, Kort HI.
    Journal: Fertil Steril; 2006 Apr; 85(4):901-6. PubMed ID: 16580372.
    Abstract:
    OBJECTIVE: To evaluate the results of a novel protocol that allows to rescue IVF unfertilized oocytes by intracytoplasmic sperm injection (ICSI). DESIGN: Prospective clinical trial. SETTING: Private reproductive medical center. PATIENT(S): Thirty patients undergoing IVF. INTERVENTION(S): Controlled ovarian stimulation (COS), conventional IVF, rescue ICSI, embryo culture, and embryo transfer. MAIN OUTCOME MEASURE(S): Identification of unfertilized IVF oocytes 6 hours after insemination and fertilization, and developmental rates of those oocytes after rescue microinjection, as well implantation and pregnancy rates (PR). RESULT(S): All oocytes (392) from 30 patients were inseminated with standard IVF 3 hours after ovum pick-up. Polar body (PB) status was checked at decumulation and rechecked 3 hours later. Eighty-two oocytes were fertilized after IVF alone and 184 nonactivated oocytes (failed fertilization) were rescue microinjected and 166 of them fertilized (20 patients). Cleavage stage on day 2 was significantly more advanced and embryo grade was higher after standard IVF fertilization than after rescue ICSI. Eight of the 30 embryos transferred were implanted in the IVF-only patients (27%) and 8 of 68 embryos in the rescue ICSI patients (12%). CONCLUSION(S): Rescue ICSI of unfertilized IVF oocytes 6 hours after insemination (9 hours after egg retrieval) can provide normal fertilization, embryo development, and pregnancy; however, corresponding outcome parameters tend to be impaired in comparison to the standard IVF fertilization results.
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