{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,20]],"date-time":"2026-02-20T10:00:33Z","timestamp":1771581633253,"version":"3.50.1"},"reference-count":32,"publisher":"Georg Thieme Verlag KG","issue":"02","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Am J Perinatol"],"published-print":{"date-parts":[[2026,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>The primary objective was to ascertain if the proportion of time in category II fetal heart rate tracing (FHRT) prior to birth among term (\u2265 37 weeks) singletons in labor was associated with composite adverse neonatal outcomes (CANO).<\/jats:p>\n                  <jats:p>The inclusion criteria for this retrospective cohort study were nonanomalous singletons at term, whose FHRT was reviewed by obstetricians blinded to the maternal characteristics and neonatal outcomes. According to ACOG's criteria, the last 20 to 120\u2009minutes of the tracing were reviewed in 20-minute epochs. The cohorts were divided into three groups: group A, category II for\u2009&lt;\u200933% of the available tracing; group B, for \u2265 33 and &lt;66%; and, group C, for \u2265 66% of the FHRT. CANO was any of the following: Apgar score\u2009&lt;\u20097 at 5\u2009minutes, mechanical ventilation, hypoxic-ischemic encephalopathy, neonatal seizure, confirmed sepsis, or neonatal death. Group A was compared with groups B and C, using an adjusted odds ratio (aOR).<\/jats:p>\n                  <jats:p>FHRT for 5,160 consecutive deliveries was reviewed, and 2,780 (53.8%) met the inclusion criteria. Of the 321,980\u2009minutes of FHRT reviewed, 223,000\u2009minutes (69.2%) were category II. The overall CANO among the cohorts was 1.4% (38\/2,780), and it did not vary significantly between group A versus B (aOR: 1.11; 95% confidence interval [CI]: 0.35\u20133.48), or between group A versus C (aOR: 0.80; 95% CI: 0.27\u20132.35). The overall rate of cesarean delivery for nonreassuring FHRT was 9.7% (270\/2,780), and it did not differ between group A versus B (aOR: 0.86; 95% CI: 0.51\u20131.47) or group A versus C (aOR: 1.18; 95% CI: 0.73\u20131.91).<\/jats:p>\n                  <jats:p>Among term deliveries, in the last 20 to 120\u2009minutes before birth, 70% of the time FHRT was category II, and the proportion of time in Category II did not significantly influence adverse neonatal outcomes.<\/jats:p>","DOI":"10.1055\/a-2601-8862","type":"journal-article","created":{"date-parts":[[2025,5,7]],"date-time":"2025-05-07T19:01:32Z","timestamp":1746644492000},"page":"235-244","source":"Crossref","is-referenced-by-count":1,"title":["Proportion of Time in Category II Fetal Heart Rate Tracing and Adverse Outcomes"],"prefix":"10.1055","volume":"43","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8260-434X","authenticated-orcid":false,"given":"Kristen A.","family":"Cagino","sequence":"additional","affiliation":[{"name":"Department of Obstetrics, Gynecology and Reproductive Sciences, McGovern Medical School at UTHealth Houston, Houston, Texas"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2158-4482","authenticated-orcid":false,"given":"Rachel L.","family":"Wiley","sequence":"additional","affiliation":[{"name":"Department of Obstetrics, Gynecology, and Reproductive Sciences, University of California San Diego, San Diego, California"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6239-8427","authenticated-orcid":false,"given":"Aaron W.","family":"Roberts","sequence":"additional","affiliation":[{"name":"Department of Obstetrics, Gynecology and Reproductive Sciences, McGovern Medical School at UTHealth Houston, Houston, Texas"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4223-3203","authenticated-orcid":false,"given":"Fabrizio","family":"Zullo","sequence":"additional","affiliation":[{"name":"Department of Department of Maternal and Child Health and Urological Sciences, Sapienza University of Rome, Rome, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hector","family":"Mendez-Figueroa","sequence":"additional","affiliation":[{"name":"Department of Obstetrics, Gynecology and Reproductive Sciences, McGovern Medical School at UTHealth Houston, Houston, Texas"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Suneet P.","family":"Chauhan","sequence":"additional","affiliation":[{"name":"Delaware Center for Maternal-Fetal Medicine of Christiana Care, Newark, 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