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Reproductive BioMedicine Online 2014-Aug

Low-dosage clomiphene reduces premature ovulation rates and increases transfer rates in natural-cycle IVF.

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M von Wolff
M Nitzschke
P Stute
N Bitterlich
S Rohner

Nøgleord

Abstrakt

Natural-cycle IVF has been suggested as an alternative IVF treatment. However, efficacy is limited due to high premature ovulation rates, resulting in low transfer rates. This study investigates whether low dosages of clomiphene citrate reduce premature ovulation rate and increase transfer rate. Of 112 women included (aged 35.2 ± 4.5 years) 108 underwent one natural-cycle IVF cycle with human chorionic gonadotrophin (HCG) to induce ovulation and 103 underwent one natural-cycle IVF cycle with 25 mg/day clomiphene from about day 7 until HCG administration. Before retrieval, 1.2 monitoring consultations per cycle were required. Clomiphene reduced premature ovulation rate, from 27.8% without to 6.8% with clomiphene (P < 0.001) and increased transfer rate from 39.8% to 54.4% (P = 0.039). Clinical pregnancy rates without and with clomiphene were 27.9% versus 25.0% per transfer and 11.1% versus 13.6% per initiated cycle. Use of clomiphene resulted in mild hot flushes and headache in 5% of patients. Nausea and persisting ovarian cyst formation was not observed. In conclusion, clomiphene citrate led to very few side effects, required 1.2 monitoring consultations, significantly reduced premature ovulation rate and significantly increased transfer rate per initiated cycle, an effect which was not age dependent.

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