Koji Nakagawa
ORCID: 0000-0003-0874-5894
· 34 papers in corpus
review
2026
BACKGROUND: Declining fertility rates are a globally documented problem, affecting even regions that have historically high fertility rates. In the Asia Pacific (APAC) region, most countries and territories are seeing birth rates drop far b…
rct
2023
INTRODUCTION: Infertility is estimated to affect 8% to 12% of reproductive-aged couples worldwide. While approximately 85% of infertile couples have an identified cause, the remaining 15% suffer physically and emotionally from unexplained i…
2023
other
2023
PURPOSE: To identify the efficacy of endometrial curettage on antibiotic-resistant chronic endometritis (CE) in infertile women. METHODS: Of 1580 women with CE, 87 with antibiotic-resistant CE after two to five cycles of antibiotic treatme…
observational
2022
PURPOSE: Can relugolix, a novel oral gonadotropin-releasing hormone receptor (GnRH) antagonist, function as an alternative ovulation inhibitor to GnRH antagonist injections? METHODS: This single-center, cross-sectional retrospective study …
2022
other
2021
Methylenetetrahydrofolate reductase (MTHFR) has various polymorphisms, and the effects of periconceptional folic acid supplementation for decreasing neural tube defects (NTDs) risk differ depending on the genotypes. This study analyzed the …
observational
2020
OBJECTIVE: To elucidate the risk factors associated with resignation from work of Japanese women undergoing infertility treatment. METHODS: A total of 1727 female patients who attended a private fertility clinic in Japan participated in th…
observational
2019
STUDY OBJECTIVE: To analyze the clinical outcomes of and predictive factors for the therapeutic effect of combination treatment of preoperative embryo cryopreservation and endoscopic surgery (surgery-assisted reproductive technology [ART] h…
nonrandomized-trial
2018
Vitamin D (VD) deficiency is associated with reproductive failure. However, the relationship between VD and maternal immunity remains unclear. We investigated the clinical efficacy of VD in maternal T-helper (Th) cytokines in 276 infertile …
observational
2017
OBJECTIVE: The endometriosis fertility index (EFI) is a novel index for predicting pregnancy after surgery. We investigated the utility of the EFI for predicting the ability to conceive without assisted reproductive technology (ART) treatme…
other
2015
PURPOSE: To investigate whether clomiphene citrate (CC) affects uterine receptivity or not, we evaluated pregnancy rates (PR) during the hormone replacement cycle (HRC) according to the period between the last day of CC administration and t…
observational
2015
Measurement of oxidative stress in the follicular fluid of infertility patients with an endometrioma
PURPOSE: Follicular fluid (FF) might reflect the environment during follicle and oocyte growth, and an evaluation of oxidative stress in the FF might be useful in predicting oocyte quality. In order to measure the oxidative stress (OS) in t…
2014
observational
2013
AIM: The aim of this study was to observe the insides of the fallopian tubes of patients with unilateral or bilateral endometriomas by using salpingoscopy and evaluate the inner cavity of the fallopian tubes according to our original scorin…
other
2013
PURPOSE: The purpose of this study was to investigate how many oocytes are needed to achieve an adequate pregnancy rate per 1 oocyte retrieval cycle in mild ovarian stimulation. METHODS: This protocol consisted of clomiphene citrate and re…
other
2012
PURPOSE: The purpose was to establish a mild ovarian stimulation protocol that would help assisted reproductive technology (ART) units to avoid scheduling on weekends. METHODS: This protocol directed patients to take 50 mg/day of clomiphen…
observational
2010
A new evaluation score that uses salpingoscopy to reflect fallopian tube function in infertile women
OBJECTIVE: To build an evaluation scoring system using the results of salpingoscopy, and to evaluate the relationship between this scoring system and the outcome of pregnancy. DESIGN: Retrospective study. SETTING: Sugiyama Clinic. INTERV…
other
2010
PURPOSE: To determine whether embryos cultured with a low oxygen level (2%) brought about beneficial effects on the outcome of ART. METHODS: This is a sequential case-control embryo-culture study. Embryos were cultured either with a gas mi…
other
2010
PURPOSE: We attempted clinical application of a plastic blade, which is a novel cryopreservation device, for vitrification of human embryos and blastocysts. METHODS: Between February 2003 and December 2007, a total of 4,430 Day 3 embryos f…
case-report
2008
Adenomyosis has only been reported in one patient with mosaic Turner syndrome. We report a case of mosaic Turner syndrome in a patient who suffered from hypermenorrhoea and severe anaemia due to adenomyosis. A 40-year-old woman visited us d…
2008
case-report
2008
This paper reports two cases showing transient thyrotoxicosis caused by prolonged use of gonadotropin-releasing hormone (GnRH) agonist. Case 1, a 31-year-old woman, was administered GnRH-agonist (leuprorelin acetate) for treatment of endome…
observational
2008
PURPOSE: For this study, the impact of basal FSH levels on ART outcomes was assessed. METHODS: From June 2003 to May 2006, 191 ART cycles were performed in our hospital. All cases were treated with GnRH-a long protocol. The patients were c…
other
2008
PURPOSE: To evaluate the cystectomy-induced damage on the follicular growth and ovulation of an affected ovary during natural cycles. METHODS: Twenty-eight infertile patients with unilateral ovarian endometriomas who underwent laparoscopic…