Journal
FERTILITY AND STERILITY
Volume 102, Issue 3, Pages 767-773Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.fertnstert.2014.06.009
Keywords
Culture temperature; embryo development; human embryo culture; in vitro fertilization
Categories
Funding
- RMAPA
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Objective: To determine whether culture at a more physiologically cooler temperature, as suggested by limited human and animal data, would improve blastulation and pregnancy rates in human clinical IVF. Design: Paired randomized controlled trial. Setting: Academic. Patient(s): Infertile couples (n = 52) with a female partner less than 42 years old with eight or more mature oocytes retrieved. Intervention(s): Mature oocytes obtained from a single cohort of oocytes were randomly divided into two groups; one was cultured at 37 degrees C and the other at 36 degrees C from the time of ICSI to the time of embryo transfer or vitrification. Paired embryo transfers were accomplished by transferring one euploid embryo from each group. DNA fingerprinting was used as needed to determine the outcome for each embryo. Main Outcome Measure(s): Rate of development of expanded blastocysts suitable for transfer or vitrification (primary outcome), fertilization, aneuploidy, and sustained implantation. Result(s): A total of 805 mature oocytes were cultured; 399 at 36 degrees C and 406 at 37 degrees C. Paired analysis demonstrated a higher rate of usable blastocyst formation per zygote at 37 degrees C (48.4%) vs. at 36 degrees C (41.2%). Rates of fertilization, aneuploidy, and sustained implantation were equivalent. Conclusion(s): IVF culture at 36 degrees C does not improve clinically relevant parameters of embryo development or sustained implantation rates. (C) 2014 by American Society for Reproductive Medicine.
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