Ovarian Suppression in Normal-Weight and Obese Women During Oral Contraceptive Use: A Randomized Controlled Trial
To assess ovarian suppression during oral contraceptive pill (OCP) use among normal-weight and obese women using two OCP doses. This was a prospective, double-blind, randomized trial of two 21-day monophasic OCP formulations (20-microgram ethinyl estradiol [E2],/100-microgram levonorgestrel compared...
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Veröffentlicht in: | Obstetrics and gynecology (New York. 1953) 2010-08, Vol.116 (2), p.275-283 |
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Zusammenfassung: | To assess ovarian suppression during oral contraceptive pill (OCP) use among normal-weight and obese women using two OCP doses.
This was a prospective, double-blind, randomized trial of two 21-day monophasic OCP formulations (20-microgram ethinyl estradiol [E2],/100-microgram levonorgestrel compared with 30-microgram ethinyl E2/150-microgram levonorgestrel) among normal-weight (body mass index 19.0-24.9) and obese (body mass index 30.0-39.9) women with regular menses and normal ovarian ultrasonography. Participants underwent transvaginal ultrasonography and phlebotomy twice weekly for 4 weeks during the third or fourth OCP cycle. We assessed OCP compliance using serum levonorgestrel levels. Outcomes included follicular development, endogenous E2 levels, ovulation, and self-reported bleeding patterns.
Two hundred twenty-six women enrolled. One hundred eighty-one participants completed the study; we retained 150 consistent OCP users in the main analysis (96 normal weight, 54 obese). Consistent users of either OCP dose had substantial suppression of follicular development; obesity and follicular development were not related. Among the consistent OCP users, 2.7% ovulated during the study cycle (3 of 96 normal-weight and 1 of 54 obese participants). Two ovulations occurred with each OCP formulation. Inconsistent OCP use or nonuse during the study cycle was associated with more ovulation (P |
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ISSN: | 0029-7844 1873-233X |
DOI: | 10.1097/AOG.0b013e3181e79440 |