婦產科CHEN, SHEE-UANSHEE-UANCHENLIEN, YIH-RONYIH-RONLIENCHANG, LI- JUNGLI- JUNGCHANGTSAI, YI-YIYI-YITSAIHO, HONG-NERNGHONG-NERNGHOYANG, YU-SHIHYU-SHIHYANG2009-01-192018-07-122009-01-192018-07-122004http://ntur.lib.ntu.edu.tw//handle/246246/99411Purpose: To report a successful pregnancy from cryopreserved sibling oocytes and intracytoplasmic sperm injection ( ICSI ) for an infertile couple with an unexpectedly low fertilization rate in the fresh in vitro fertilization (IVF) cycle. Methods: The woman had bilateral tubal obstruction and polycystic ovarian syndrome. The man had normal semen parameters. The couple underwent a cycle of controlled ovarian hyperstimulation in that 20 oocytes were retrieved. Twelve oocytes were conventionally inseminated and eight were cryopreserved using a slow freezing method. However, only one oocyte was fertilized, and no pregnancy was achieved. In the next cycle, the frozen oocytes were thawed and ICSI was performed. Results: After thawing, seven oocytes (88%) survived and one was damaged. Six were at the metaphase II stage and were injected. Five (83%) achieved normal fertilization, and all of them cleaved (100%). After replacement of the embryos, a singleton pregnancy developed. A healthy female baby was delivered at term. Karyotyping revealed 46, XX. Conclusions: In addition to well-known indications, cryopreservation of excess sibling oocytes for patients receiving IVF has a possible advantage of preventing unexpectedly low fertilization rate or fertilization failures.en-UScryopreserved oocytesntracytoplasmic sperm injectionunexpected fertilization failures