Pyridostigmine cotreatment for controlled ovarian hyperstimulation in low responders undergoing in vitro fertilization-embryo transfer

Objective: To investigate the effect of pyridostigmine, an acetylcholinesterase inhibitor, as cotreatment for controlled ovarian hyperstimulation (COH) in low responders. Design: Randomized. double-blind, placebo-controlled study. Setting: A reproductive medicine unit in a university hospital. Patient(s): Seventy infertile women with a history of low ovarian response to COH using a GnRH agonist as part of a long stimulation protocol in previous IVF-ET cycles. Intervention(s): Sixty milligrams of pyridostigmine or placebo was administered orally twice daily from the first day of COH until the day of hCG injection in patients undergoing IVF-ET cycles. Main Outcome Measure(s): In vitro fertilization results. pregnancy outcome, and serum and intrafollicular concentrations of GH and insulin-like growth factor-1. Result(s): Pyridostigmine cotreatment was associated with significant decreases in the amount of gonadotropins and the duration of stimulation required. The clinical pregnancy rate was higher in the pyridostigmine group, but this difference was not statistically significant (25.7% vs. 11.4%). The serum GH level on the day of hCG injection was significantly higher in the pyridostigmine group than in the placebo group. Follicular fluid concentrations of GH and insulin-like growth factor-1 were significantly higher in the pyridostigmine group Conclusion(s): This study suggests that pyridostigmine cotreatment for COH could affect the serum and intrafollicular GH and insulin-like group th factor-1 concentrations and. hence, improve the ovarian response to COH and the results of IVF in low responders undergoing IVF-ET. (Fertil Steril(R) 1999;71.652-7. (C)1999 by American Society for Reproductive Medicine.).