We have located links that may give you full text access.
Reassessing the impact of letrozole co-administration in controlled ovarian hyperstimulation: findings from a single-center repeated measures study.
Journal of Assisted Reproduction and Genetics 2024 Februrary 22
PURPOSE: To explore whether letrozole improved outcomes in subsequent controlled ovarian hyperstimulation (COH) cycles.
METHODS: This was a retrospective repeated measures cohort study examining COH cycles. Patients were included if they underwent two cycles for unexplained infertility, male factor infertility, or planned oocyte/embryo cryopreservation. The first cycles for all patients implemented a non-letrozole, conventional gonadotropin protocol. Second cycles for the study group included letrozole (2.5-7.5 mg for 5 days) with no medication change to second cycles amongst controls. Our primary objective was to compare oocyte yield. Cohorts were then subdivided by pursuit of oocyte (OC) or embryo (IVF) cryopreservation. Secondary outcome amongst the OC subgroup was oocyte maturation index (metaphase II (MII)/total oocytes). Secondary outcomes amongst the IVF subgroup were normal fertilization rate (2-pronuclear zygotes (2PN)/oocytes exposed to sperm), blastocyst formation rate (blastocysts/2PNs), and embryo ploidy (%euploid and aneuploid).
RESULTS: Fifty-four cycles (n = 27) were included in letrozole and 108 cycles (n = 54) were included in control. Oocyte yield was higher in second cycles (p < 0.008) in the letrozole group but similar in second cycles (p = 0.26) amongst controls. Addition of letrozole did not impact MII index (p = 0.90); however, MII index improved in second cycles amongst controls (p < 0.001). Both groups had similar rates of normal fertilization (letrozole: p = 0.52; control: p = 0.61), blast formation (letrozole: p = 0.61; control: p = 0.84), euploid (letrozole: p = 0.29; control: p = 0.47), and aneuploid embryos (letrozole: p = 0.17; control: p = 0.78) between cycles.
CONCLUSIONS: Despite improved oocyte yield, letrozole did not yield any difference in oocyte maturation or embryo outcomes.
METHODS: This was a retrospective repeated measures cohort study examining COH cycles. Patients were included if they underwent two cycles for unexplained infertility, male factor infertility, or planned oocyte/embryo cryopreservation. The first cycles for all patients implemented a non-letrozole, conventional gonadotropin protocol. Second cycles for the study group included letrozole (2.5-7.5 mg for 5 days) with no medication change to second cycles amongst controls. Our primary objective was to compare oocyte yield. Cohorts were then subdivided by pursuit of oocyte (OC) or embryo (IVF) cryopreservation. Secondary outcome amongst the OC subgroup was oocyte maturation index (metaphase II (MII)/total oocytes). Secondary outcomes amongst the IVF subgroup were normal fertilization rate (2-pronuclear zygotes (2PN)/oocytes exposed to sperm), blastocyst formation rate (blastocysts/2PNs), and embryo ploidy (%euploid and aneuploid).
RESULTS: Fifty-four cycles (n = 27) were included in letrozole and 108 cycles (n = 54) were included in control. Oocyte yield was higher in second cycles (p < 0.008) in the letrozole group but similar in second cycles (p = 0.26) amongst controls. Addition of letrozole did not impact MII index (p = 0.90); however, MII index improved in second cycles amongst controls (p < 0.001). Both groups had similar rates of normal fertilization (letrozole: p = 0.52; control: p = 0.61), blast formation (letrozole: p = 0.61; control: p = 0.84), euploid (letrozole: p = 0.29; control: p = 0.47), and aneuploid embryos (letrozole: p = 0.17; control: p = 0.78) between cycles.
CONCLUSIONS: Despite improved oocyte yield, letrozole did not yield any difference in oocyte maturation or embryo outcomes.
Full text links
Related Resources
Trending Papers
Revascularization Strategy in Myocardial Infarction with Multivessel Disease.Journal of Clinical Medicine 2024 March 27
Intravenous infusion of dexmedetomidine during the surgery to prevent postoperative delirium and postoperative cognitive dysfunction undergoing non-cardiac surgery: a meta-analysis of randomized controlled trials.European Journal of Medical Research 2024 April 19
The Tricuspid Valve: A Review of Pathology, Imaging, and Current Treatment Options: A Scientific Statement From the American Heart Association.Circulation 2024 April 26
Consensus Statement on Vitamin D Status Assessment and Supplementation: Whys, Whens, and Hows.Endocrine Reviews 2024 April 28
Management of Diverticulitis: A Review.JAMA Surgery 2024 April 18
Interstitial Lung Disease: A Review.JAMA 2024 April 23
Get seemless 1-tap access through your institution/university
For the best experience, use the Read mobile app
All material on this website is protected by copyright, Copyright © 1994-2024 by WebMD LLC.
This website also contains material copyrighted by 3rd parties.
By using this service, you agree to our terms of use and privacy policy.
Your Privacy Choices
You can now claim free CME credits for this literature searchClaim now
Get seemless 1-tap access through your institution/university
For the best experience, use the Read mobile app