Experience with transvaginal ultrasound-guided aspiration of supernumerary follicles for the prevention of multiple pregnancies after ovulation induction and intrauterine insemination

To avoid multiple pregnancies caused by ovulation induction. Infertile couples treated in the Women’s Hospital and the Institute of Reproductive Medicine of the University of Münster, Münster, Germany. The outcome of ovulation induction in patients in whom supernumerary ovarian follicles were aspirated transvaginally was compared with the outcome in patients in whom this intervention was not necessary. In a second randomized prospective study, the efficacy of a low dosage of gonadotropins was compared with a higher dosage. Two hundred twenty-seven couples suffering from male infertility, unexplained infertility, incipient ovarian failure, and polycystic ovaries. Aspirations were performed if more than three follicles were sized>14mm. Number of (multiple) pregnancies. During 232 ovulation inductions, 127 aspirations of supernumerary follicles were performed (54.7%). The pregnancy rate (PR) in these cycles was similar to cycles in which aspirations were unnecessary (24.4% versus 21.9%). The efficacy of 75 units of FSH administered daily during the recruitment phase of follicular development was equivalent to 150 units of FSH (PR: 32.4% versus 31.6%), but supernumerary follicles were fewer (26.5% versus 76.3%). Six twins, two triplets (multiple PR: 10.4%), and no ovarian hyperstimulation syndrome occurred. Transvaginal aspiration of supernumerary follicles does not reduce the PR in ovulation induction. Supernumerary follicles can be avoided by low-dose administration of gonadotropins without compromising the PR.