Effect of estradiol supplementation on luteal support following a significant reduction in serum estradiol levels after hCG triggering: a prospective randomized controlled trial

• Published in: Reproductive biology and endocrinology Vol. 22; no. 1; pp. 117 - 9
• Main Authors: Li, Na, Huang, Yu, Fan, LiJuan, Shi, Zan, Cai, He, Shi, JuanZi, Wang, Hui
• Format: Journal Article
• Language: English
• Published: England BioMed Central Ltd 12-09-2024; BioMed Central; BMC
• Subjects: Adult; Care and treatment; Chorionic gonadotropin; Chorionic Gonadotropin - administration & dosage; Embryo Transfer - methods; Estradiol; Estradiol - administration & dosage; Estradiol - blood; Estradiol supplementation; Female; Fertilization in vitro; Fertilization in Vitro - methods; Health aspects; Hormone therapy; Humans; Infertility, Female; Luteal Phase - blood; Luteal Phase - drug effects; Luteal phase support; Ongoing pregnancy rate; Oocyte Retrieval - methods; Ovulation Induction - methods; Patient outcomes; Pregnancy; Pregnancy Rate; Progesterone - administration & dosage; Progesterone - blood; Prospective Studies; Serum estradiol drop; China; Serum estradiol drop; Ongoing pregnancy rate; Estradiol supplementation; Luteal phase support
• ISSN: 1477-7827; 1477-7827
• DOI: 10.1186/s12958-024-01275-x

This study aimed to evaluate the impact of adding 4 mg estradiol valerate to progesterone for luteal support on pregnancy rates in IVF cycles following a long protocol with reduced luteal serum estradiol levels post-hCG triggering.
The prospective randomized controlled trial was conducted at a public tertiary hospital reproductive center with 241 patients who experienced a significant decrease in serum estrogen levels post-oocyte retrieval.
Participants received either a daily 4 mg dose of estradiol valerate in addition to standard progesterone or standard progesterone alone for luteal support.
The ongoing pregnancy rate did not show a significant difference between the E2 group and the control group (56.6% vs. 52.2%, with an absolute rate difference (RD) of 4.4%, 95% CI -0.087 to 0.179, P = 0.262). Similarly, the live birth rate, implantation rate, clinical pregnancy rate, early abortion rate, and severe OHSS rate were comparable between the two groups. Notably, the E2 group had no biochemical miscarriages, contrasting significantly with the control group (0.0% vs. 10.7%, RD -10.7%, 95% CI -0.178 to -0.041, P = 0.000). In the blastocyst stage category, the clinical pregnancy rate was notably higher in the E2 group compared to the control group (75.6% vs. 60.8%, RD 14.9%, 95% CI 0.012 to 0.294, P = 0.016).
Adding 4 mg estradiol valerate to progesterone for luteal support does not affect the ongoing pregnancy rate in embryo transfer cycles using a long protocol with a significant decrease in serum estradiol levels after hCG triggering. However, it may reduce biochemical miscarriages and positively impact clinical pregnancy rates in blastocyst embryo transfer cycles.
ChiCTR1800020342.