الفهرس 
Precycle estradiol in synchronization and scheduling of antagonist cycles
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Abstract
Introduction: Luteal estradiol improved follicular synchronization. Methods: Women aged 20 to 40 years old who attended at the IVF unit (Kasr Elaini hospital - Faculty of Medicine - Cairo University) and private centers for IVF,The study included 72 infertile women who were candidate to receive the conventional antagonist protocol. They randomly divided into 2 groups: group (A) (n=36): Estradiol valerate (E2) is administered at daily dose of 4mg from day 20 of the preceding cycle onwards for maximum 10 days. Stimulation with FSH should be started with the gap of 1 day after the last dose of E2. group (B) (n=36): served as controls that remain untreated during the luteal phase.Results: All statistical calculations were done using computer program IBM SPSS. The mean follicular size at day 8 among the pretreatment group (13.1mm ±0.1) was less than that among control group (14.6mm ±0.4). The mean number of follicles {u2265}16mm at the day of trigger among the pretreatment group (9.8±0.4) was more than that among the control group (7.7±0.7). The mean number of mature follicles among the pretreatment group (7.3±0.4) was more than that among the control group (6.3±0.6).However the mean days of stimulation among the pretreatment group (11.0±0.9) was longer than that among control group (10.1±1.3).The total FSH dose among the pretreatment group (2668.2±62.5) was higher than that among the control group (2439.8±110.5).There were no significant difference regarding number of embryo transfer and occurrence of chemical pregnancy