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Interaction between MHR and FHR was assessed through their differences and cross-sample entropy analysis. <jats:italic>Main results<\/jats:italic>. With progression of labor, there was an increase in most MHR and FHR linear indices, a decrease of entropy indices and an increase of MHR and FHR synchrony\/regularity, whereas the sympatho-vagal balance (LF\/HF) increased in the mother but decreased in the fetus. Mean MHR, predominance of low frequencies (LF<jats:sub>norm<\/jats:sub>) and LF\/HF were significantly higher in the OVD group, while the opposite occurred with the high frequencies (HF) and entropy. The synchronization\/regularity between MHR and FHR was significantly higher in OVD. A sensitivity and specificity of 94.1% and 70.4%, respectively, were achieved in the classification of OVD cases using an univariate linear discriminant. <jats:italic>Significance<\/jats:italic>. Maternal-FHR variability analysis adds information regarding intrapartum physiology and maternal-fetal behavior and might be considered in prediction models.<\/jats:p>","DOI":"10.1088\/1361-6579\/ade113","type":"journal-article","created":{"date-parts":[[2025,6,4]],"date-time":"2025-06-04T22:55:41Z","timestamp":1749077741000},"page":"065001","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["An exploratory study on maternal-fetal heart rate variability during normal and operative vaginal delivery: physiopathological, behavioral and clinical perspectives"],"prefix":"10.1088","volume":"46","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6558-8966","authenticated-orcid":true,"given":"Hern\u00e2ni","family":"Gon\u00e7alves","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5174-127X","authenticated-orcid":true,"given":"Beatriz","family":"Ferro","sequence":"additional","affiliation":[]},{"given":"Paula","family":"Pinto","sequence":"additional","affiliation":[]},{"given":"Jo\u00e3o","family":"Bernardes","sequence":"additional","affiliation":[]}],"member":"266","published-online":{"date-parts":[[2025,6,13]]},"reference":[{"key":"pmeaade113bib1","doi-asserted-by":"publisher","first-page":"427","DOI":"10.5468\/ogs.2014.57.6.427","article-title":"Intrapartum ultrasound: a useful method for evaluating labor progress and predicting operative vaginal delivery","volume":"57","author":"Ahn","year":"2014","journal-title":"Obstet. 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