{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2023,12,22]],"date-time":"2023-12-22T06:58:28Z","timestamp":1703228308879},"reference-count":50,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2021,1,4]],"date-time":"2021-01-04T00:00:00Z","timestamp":1609718400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"DOI":"10.13039\/501100001691","name":"Japan Society for the Promotion of Science","doi-asserted-by":"publisher","award":["18K09976","19K10486"],"award-info":[{"award-number":["18K09976","19K10486"]}],"id":[{"id":"10.13039\/501100001691","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001691","name":"Japan Society for the Promotion of Science","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100001691","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["obgyn.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["J of Obstet and Gynaecol"],"published-print":{"date-parts":[[2021,3]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Aim<\/jats:title><jats:p>This study aimed to examine the relationship between the temporal changes in endometrial blood flow impedance during natural and hormone replacement therapy (HRT) cycles and clinical outcomes of vitrified\u2010warmed embryo transfer (ET).<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>This retrospective observational cohort study included 60 women, 28 with natural, and 32 with HRT cycles, who underwent vitrified\u2010warmed ET. Uterine radial artery resistance index (RA\u2010RI) was measured during the natural and HRT cycles at the following time points: early follicular phase, day of the human chorionic gonadotropin injection during a natural cycle or day of progesterone administration during an HRT cycle, and day of ET.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The clinical pregnancy rates of the natural and HRT cycles were 32.1% and 34.4%, respectively. The RA\u2010RI at the early follicular phase was significantly lower in the pregnant group than in the nonpregnant group with natural but not HRT cycles (<jats:italic>p<\/jats:italic> = 0.04). The odds ratio for pregnancy was 0.70 (95% confidence interval [CI], 0.52\u20130.95) when the RA\u2010RI value at the early follicular phase was increased by 0.01 in the natural cycle. With the natural cycle, the area under the receiver\u2010operating characteristic curves for the RA\u2010RI at the early follicular phase with a threshold of 0.68 was 0.75 (95% CI, 0.57\u20130.93), and the positive and negative predictive values were 0.53 (95% CI, 0.37\u20130.59) and 0.92 (0.74\u20130.99), respectively.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>RA\u2010RI at the early follicular phase might be an effective and useful tool for deciding between natural or HRT cycles for vitrified\u2010warmed ET.<\/jats:p><\/jats:sec>","DOI":"10.1111\/jog.14637","type":"journal-article","created":{"date-parts":[[2021,1,5]],"date-time":"2021-01-05T00:38:31Z","timestamp":1609807111000},"page":"1052-1063","update-policy":"http:\/\/dx.doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Relationship between temporal changes of endometrial blood flow impedance during natural and hormone replacement cycles and prediction of pregnancy during vitrified\u2010warmed embryo transfer"],"prefix":"10.1111","volume":"47","author":[{"given":"Kuniaki","family":"Ota","sequence":"first","affiliation":[{"name":"Fukushima Medical Center for Children and Women Fukushima Medical University  Fukushima Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Satoru","family":"Shiraishi","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology Nasu Red Cross Hospital  Tochigi Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Toshifumi","family":"Takahashi","sequence":"additional","affiliation":[{"name":"Fukushima Medical Center for Children and Women Fukushima Medical University  Fukushima 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