RESUMEN
OBJECTIVE: To assess the utility of transforming an in vitro fertilization (IVF) cycle with low ovarian response to an intrauterine insemination (IUI) cycle. STUDY DESIGN: The inclusion criteria were women undergoing IVF because of idiopathic infertility, a mild to moderate male factor or IUI failure, with at least 1 normal, patent tube. When ovarian stimulation produced 2-4 follicles > or = 18 mm, the IVF cycle was converted to an IUI cycle. In cases with 4 follicles, estradiol had to be < 800 pg/mL. A total of 57 cycles were analyzed. RESULTS: The clinical pregnancy rate (PR) was 14.0% (8/57) in IVF cycles converted to IUI vs. 17.3% in our general IUI population (240/1,389). Converted cycles were associated with longer ovarian stimulation and with lower estradiol levels and less mature follicles than was IUI in the general population. There was a trend toward higher PR in women starting ovarian stimulation with 225 IU of gonadotropins (18.2%) than in those starting with higher doses (8.6%) (P > .05). CONCLUSION: In IVF low responders with at least 1 normal, patent tube when 2-4 follicles are observed, converting the IVF cycle to an IUI cycle yields a PR of 14.0%. This option should be considered in the management of low responders, especially those not stimulated with high doses of gonadotropins.
