{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,21]],"date-time":"2026-09-21T13:14:58Z","timestamp":1789996498258,"version":"4.0.1"},"reference-count":25,"publisher":"Walter de Gruyter GmbH","license":[{"start":{"date-parts":[[2026,9,22]],"date-time":"2026-09-22T00:00:00Z","timestamp":1790035200000},"content-version":"unspecified","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec id=\"j_jpm-2026-0398_abs_001\">\n                    <jats:title>Objectives<\/jats:title>\n                    <jats:p>Umbilical venous Doppler and umbilical vein blood flow assessment complement arterial Doppler indices by reflecting placental\u2013fetal hemodynamics, venous return, and fetal cardiovascular adaptation. Despite decades of research on fetal venous Doppler, its scientific evolution and the position of umbilical vein blood flow within the field remain insufficiently mapped. This study evaluated global research trends in fetal venous Doppler, emphasizing umbilical venous Doppler and umbilical vein blood\u00a0flow.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec id=\"j_jpm-2026-0398_abs_002\">\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>A bibliometric and visualization analysis was conducted using the Web of Science Core Collection. English-language articles and reviews published between 1980 and 2025 were included. Data were analyzed using bibliometrix and Biblioshiny. Publication trends, citation patterns, leading contributors, collaboration networks, Bradford\u2019s Law, keyword co-occurrence, thematic structure, and temporal topic changes were examined.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec id=\"j_jpm-2026-0398_abs_003\">\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>The final dataset included 787 documents from 230 sources, involving 2,692 authors and 12,887 cited references. Scientific output increased steadily, with an annual growth rate of 7.93\u202f%. Ultrasound in Obstetrics &amp; Gynecology was the leading journal, while the United\u00a0States was the most productive country. Keyword, thematic, and trend analyses identified ductus venosus, umbilical vein, Doppler ultrasound, fetal growth restriction, placental function, perinatal outcome, and fetal hemodynamic adaptation as central themes, with recent trends indicating growing interest in quantitative umbilical vein flow assessment.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec id=\"j_jpm-2026-0398_abs_004\">\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Fetal venous Doppler research has expanded steadily over four decades. The increasing focus on umbilical vein blood flow highlights the need for standardized measurement techniques, gestational age-specific reference ranges, reproducibility, and outcome-based validation to clarify its independent clinical value in high-risk pregnancies.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1515\/jpm-2026-0398","type":"journal-article","created":{"date-parts":[[2026,9,21]],"date-time":"2026-09-21T12:56:08Z","timestamp":1789995368000},"source":"Crossref","is-referenced-by-count":0,"title":["Global research trends in fetal venous Doppler and umbilical vein blood flow: a bibliometric and visualization analysis"],"prefix":"10.1515","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6147-8102","authenticated-orcid":false,"given":"Sevil","family":"Cicek","sequence":"first","affiliation":[{"name":"Department of Obstetrics and Gynecology , Goztepe Prof. Dr. Suleyman Yalcin City Hospital, Istanbul Medeniyet University , Istanbul , T\u00fcrkiye"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6951-4761","authenticated-orcid":false,"given":"Zehra","family":"Tavukcuoglu","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology , Goztepe Prof. Dr. Suleyman Yalcin City Hospital, Istanbul Medeniyet University , Istanbul , T\u00fcrkiye"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9639-7484","authenticated-orcid":false,"given":"Yasemin Beyza","family":"Kaya Parspanci","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology , Goztepe Prof. Dr. Suleyman Yalcin City Hospital, Istanbul Medeniyet University , Istanbul , T\u00fcrkiye"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5261-1792","authenticated-orcid":false,"given":"Reyhan","family":"Ayaz","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology , Goztepe Prof. Dr. Suleyman Yalcin City Hospital, Istanbul Medeniyet University , Istanbul , T\u00fcrkiye"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"374","published-online":{"date-parts":[[2026,9,22]]},"reference":[{"key":"2026092112560465772_j_jpm-2026-0398_ref_001","doi-asserted-by":"crossref","unstructured":"Kiserud, T. 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