A controlled trial of natural cycle versus microdose gonadotropin-releasing hormone analog flare cycles in poor responders undergoing in vitro fertilization

Objective To determine the efficacy of natural-cycle IVF compared with controlled ovarian hyperstimulation in poor responders. Design Randomized, controlled study. Setting Private center for assisted reproduction. Patient(s) One hundred twenty-nine women who were poor responders in a previous IVF cycle. Intervention(s) Fifty-nine women underwent 114 attempts of natural-cycle IVF, and 70 women underwent 101 attempts of IVF with controlled ovarian hyperstimulation with microdose GnRH analog flare. Main outcome measure(s) Number of oocytes retrieved, pregnancy rate (PR) per cycle, PR per transfer, and implantation rate. Result(s) The poor responders treated with natural-cycle IVF and those treated with micro-GnRH analog flare showed similar PRs per cycle and per transfer. The women treated with natural-cycle IVF showed a statistically significant higher implantation rate (14.9%) compared with controls (5.5%). When subdivided into three groups according to age (≤35 years, ≥36-39 years, ≥40 years), younger patients had a better PR than the other two groups. Conclusion(s) In poor responders, natural-cycle IVF is at least as effective as controlled ovarian hyperstimulation, especially in younger patients, with a better implantation rate. © 2004 by American Society for Reproductive Medicine

Cetrorelix protocol versus gonadotropin-releasing hormone analog suppression long protocol for superovulation in intracytoplasmic sperm injection patients older than 40.

Objective: To determine which protocols work better between cetrorelix and long protocols in older patients in a randomized controlled study. Design: A controlled randomized study in a single private IVF center. Setting: Infertile women referred to a private IVF center. Patient(s): Five hundred sixty-four women 40 years or older undergoing IVF. Intervention(s): At their first IVF cycle, the women were randomized into two study groups using a computer-generated number sequence: 281 cases were treated with the cetrorelix protocol, and 283 patients were treated with a long protocol for controlled ovarian hyperstimulation. Main Outcome Measure(s): Days of stimulation, E2 on the day of hCG administration, amount of FSH administered, number of oocytes yielded, number of embryos obtained, pregnancy rate, and implantation rate. Result(s): Patients treated with the long protocol showed a significantly higher number of oocytes retrieved and a higher pregnancy rate for both the cycle and transfer with respect to the cetrorelix protocol patients. The other parameter evaluated did not show any statistically significant differences. Conclusion(s): Our study showed that the long protocol performed better in older women than the cetrorelix protocol and that the GnRH antagonist may be detrimental in older women. © 2009 American Society for Reproductive Medicine

Use of a medium buffered with N-hydroxyethylpiperazine-N-ethanesulfonate (HEPES) in intracytoplasmic sperm injection procedures is detrimental to the outcome of in vitro fertilization.

Abstract OBJECTIVE: This study was conducted to determine whether N-hydroxyethylpiperazine-N-ethanesulfonate (HEPES)-buffered medium used for the microinjection of sperm into oocytes may be detrimental for the embryo. DESIGN: Controlled randomized study.SETTING: Private IVF center.PATIENT(S): Women (n = 708) undergoing ICSI.INTERVENTION(S): The women were randomized into two study groups: 2,204 oocytes from 357 women were treated using a medium buffered with bicarbonate without HEPES during the ICSI procedure, and 2,168 oocytes from 351 women were treated using a medium buffered with HEPES during the ICSI procedure.MAIN OUTCOME MEASURE(S): Fertilization rate, degeneration rate, triploid rate, cleavage rate, embryo quality, pregnancy rate, implantation rate, and abortion rate.RESULT(S): Oocytes treated with a HEPES-buffered medium showed a statistically significant higher rate of triploid and degenerated oocytes after fertilization with ICSI compared with oocytes treated with a medium without HEPES. The embryos obtained from oocytes microinjected with a HEPES-buffered medium showed a statistically significant higher rate of highly fragmented embryos compared with the controls. Pregnancy rate and implantation rate were statistically significantly lower in the patient group with oocytes treated with the HEPES-buffered medium. The other parameters evaluated did not show any statistically significant differences.CONCLUSION(S): Our study showed that the use of media buffered with HEPES, during the microinjection of sperm into the oocytes, is detrimental for IVF outcome and should be avoided

Natural-cycle in vitro fertilization in poor responder patients: a survey of 500 consecutive cycles

Objective: To determine the role of the natural cycle for in vitro fertilization (IVF) in poor responder patients. Design: Retrospective survey. Setting: Private center for assisted reproduction. Patient(s): 294 women who were poor responders in a previous IVF cycle. Intervention(s): Analysis of 500 consecutive natural cycles IVF. Main Outcome Measure(s): Number of cycles with oocytes, pregnancy rate per cycle, per transfer, and implantation rate. Result(s): Oocytes were found in 391 cases (78.1%), and cleaving embryos suitable for transfer were obtained in 285 cycles (57.0%). Pregnancy was observed in 49 cases, with a pregnancy rate of 9.8% per cycle, 17.1% per transfer, and 16.7% per patient. The patients were subdivided arbitrarily by the women's age into three groups. Patients 35 years old or younger showed a pregnancy rate of 18.1% per cycle, 29.2% per transfer, and 31.7% per patient. Women aged between 36 and 39 years showed a pregnancy rate of 11.7% per cycle, 20.6% per transfer, and 20.3% per patient. Women 40 years old or older showed a pregnancy rate of 5.8% per cycle, 10.5% per transfer, and 9.7% per patient. No differences were found for any of the evaluated parameters, independent of which cycle was the first, the second, third, fourth, or fifth, or further consecutive cycle. Conclusion(s): In poor responder patients, natural-cycle IVF is an effective treatment, especially in younger women. (Fertil Steril (R) 2009;92:1297-301. (C) 2009 by American Society for Reproductive Medicine.

Number of embryos transferred and implantation

Multiple pregnancies are considered the most frequent and serious complication of assisted reproduction technology. To reduce the frequency of multiple pregnancies, several centers have adopted a policy of reducing the number of embryos transferred in the uterus, suggesting single embryo transfer. Even though a significant number of papers have been published on this issue, no general consensus exists on how many embryos to replace in the uterus and at which cleavage stage. We conducted a retrospective study on cycles performed throughout 2003, analyzing the relation between the number of embryos transferred and the pregnancy and implantation rates, evaluating also the role of the woman's age. No differences were found among the groups except in one-embryo transferred women, which were mostly natural cycles, for estradiol levels, number of mature oocytes retrieved, number of top quality embryos, and pregnancy rate. The implantation rate was significantly higher in the two-embryo transfers versus three-embryo transfers. We found higher pregnancy and implantation rates with similar multiple pregnancy rates in patients where only two embryos were transferred versus three embryos transfer when women were less than 35 years old. In women aged less than 35 years, which in turn have the higher expectancy of successful pregnancy and also the higher risk of multiple pregnancy, the single embryo transfer is a suitable choice for these patients