Nimodipine to Prevent LH Surge During Ovulation Induction: Blinded Placebo-controlled RCT (NCT01672801) | Clinical Trial Compass
CompletedNot Applicable
Nimodipine to Prevent LH Surge During Ovulation Induction: Blinded Placebo-controlled RCT
United States18 participantsStarted 2012-09
Plain-language summary
The main purpose of this study is to test the effectiveness of nimodipine in preventing a luteinizing hormone (LH) surge in women undergoing ovulation induction with clomiphene citrate. It is important to prevent the premature LH surge in controlled ovarian stimulation to allow adequate recruitment of follicles, proper maturation of a dominant follicle before ovulation, and effectively time insemination with semen to allow fertilization of a mature egg to occur.
The investigators are also conducting this study to determine medication side effect profile (including lightheadedness or dizziness from low blood pressure or rapid heart rate, headache, and nausea), patient treatment compliance, and clinical pregnancy (positive pregnancy test and ultrasound evidence of fetal heart rate). Finally, LH and follicle stimulating hormone (FSH) serum levels will be measured to determine effect of nimodipine on these hormones.
As a calcium channel blocker, nimodipine has been shown to block calcium mediated release of gonadotropin releasing hormone in animal and preliminary human studies. The investigators hypothesize that nimodipine, a calcium channel blocker, will prevent or delay the LH surge during controlled ovarian stimulation cycles using clomiphene citrate in subfertile patients undergoing assisted reproduction with intrauterine insemination (IUI).
Who can participate
Age range25 Years – 40 Years
SexFEMALE
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Inclusion Criteria:
* Age 25-40 years at the time of enrollment
* Both ovaries intact by history and ultrasound assessment
* Early follicular phase (day 2-4) serum FSH level \<20 mIU/mL
* Diagnosis of subfertility with a recommended treatment of COH and IUI
* Providing written informed consent in English
Exclusion Criteria:
* Body mass index (BMI) \>38 kg/m2
* Early follicular phase (day 2-4) serum FSH level ≥20 mIU/mL
* History of overstimulated cycle defined as \>3 mature follicles of ≥17 mm
* Abnormal uterine cavity and/or tubal disease (as evidenced by sonohysterogram or hysterosalpingogram)
* Diagnosis of infertility with a clear indication for in-vitro fertilization, such as bilateral tubal occlusion
* Severe male factor infertility: Total Motile Sperm Count \< 2x106 post washing (sperm deemed inadequate for IUI preparation)
* Any ovarian or abdominal abnormality that may interfere with adequate TV ultrasound evaluation
* Absence of one or both ovaries
* Any contraindication to being pregnant or carrying a pregnancy to term
* Unexplained gynecological bleeding
* Any medical condition that would jeopardize the patient or the integrity of the data obtained including:
* Prior reaction or side effects from previous calcium channel blocker use
* Any medical condition that may interfere with the absorption, distribution, metabolism or excretion of nimodipine such as hepatic disease, hypertension, seizure, concurrent infection, depression, reflux (see #12 below).
* Mental h…