The aim of this study was to establish if a second dose of GnRHa repeated 12 h following the initial dose optimizes the cycle outcome in terms of oocyte maturity in women with PCOS of Asian origin.

The study was approved by the institutional review board and written, informed consent will be obtained from each participant. Infertile women with a diagnosis of PCOS, who undergo the IVF / ICSI cycle are assigned to two groups randomly. The random method is that the statistician will be provided a blocked randomization list for the number of patients,and whenever an eligible patient is referred, a sealed envelope will be delivered to the clinical physician. The random allocation is concealed from the physician performing the IVF/ICSI treatment cycle. All patients will receive antagonist controlled ovarian stimulation protocol with same starting dose of gonadotropin. On the day of trigger, serum E2, LH, and P4 concentrations will be measured. When three lead follicles achieved 17-mm diameter, in group A, the final oocyte maturation will be triggered with a single dose of 0.2 mg s.c triptorelin (decapeptyl), 35 h prior to oocyte retrieval in both the groups and in Group B, a repeat dose of 0.1 mg 12 h following the first dose. Post-trigger, LH, and progesterone levels will be measured 12 h following the first dose of GnRHa and ovum-pick up day. Transvaginal ultrasound-guided oocyte pickup (OPU) will be performed 35 h following the first dose under intravenous sedation with single-lumen oocyte retrieval needle. Post pickup on days 4 and 7, an assessment for symptoms and signs of OHSS and patients will be advised to present at any time within 2 weeks of GnRHa administration.

In all subjects, IVF or ICSI will be performed according to the standard operating procedure. The fertilization will be assessed 18 h following ICSI or IVF by the appearance of two pronuclei. All embryos will be cryopreserved by vitrification in the form of blastocyst. The frozen embryo transfer (FET) cycles will be performed following pretreatment with oral contraceptive pills in an artificial cycle with a daily dose of orally administered 6 mg of estradiol. When the endometrium evaluated by TVS was \>8 mm with triple-layer morphology, it is considered mature. This will be followed by endometrial priming with 5 days of injectable progesterone for blastocysts. The transfer will be performed using Sure-Pro Ultra catheter. Luteal-phase supplementation will be continued with vaginal progesterone and estradiol for 14 days and when pregnancy will be achieved till 10 weeks of gestation..

The primary outcome will be the maturity rate of the oocytes (the ratio of MII oocytes to the total number of oocytes retrieved) and oocyte yield. The secondary outcomes are fertilization rate, number and quality of blastocyst embryos, OHSS occurrence, and post-trigger serum LH (IU/L), and P4 (ng/mL) levels. In addition, implantation and clinical pregnancy rates will be also evaluated. Data collection will be performed by using questionnaires to be filled as per the available records and laboratory results. Data analysis will be done through descriptive and perceptive statistical methods by using SPSS software version 20 for windows.