Résumé
Objective To investigate the relation between ovarian blood-flow resistance index (RI) measured with color Doppler ultrasound and the dosage of pituitary desensitization medication in controlled ovarian hyperstimulation cycle.Methods Thirty infertile females were randomized into group at routine dose of gonadotropin releasing hormone agonist (GnRHa) (group A) and group at reduced dose of GnRHa (group B).Ovarian arterial blood-flow RI was checked on cycle day 8 and on the day of human chorionic gonadotropin ( HCG) administration with transvaginal color Doppler ultrasound.Results The ovarian arterial blood-flow RI on cycle day 8,the total dosage and the duration of human manopausal gonadotropin (HMG) administration were significantly reduced in group B. In both groups,the ovarian arterial blood-flow RI was significantly decreased in the ovary with more dominant follicles (follicle diameter >10 mm) compared with the opposite one.Conclusions In controlled ovarian hyperstimulation cycle,compared with routine protocol of GnRHa administration,reduced dose of GnRHa could decrease the ovarian arterial blood-flow RI,the total dosage and the duration of HMG administration without reducing pregnancy rate.