{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,4,25]],"date-time":"2025-04-25T04:09:49Z","timestamp":1745554189442,"version":"3.40.4"},"reference-count":4,"publisher":"S. Karger AG","issue":"4","license":[{"start":{"date-parts":[[2003,1,1]],"date-time":"2003-01-01T00:00:00Z","timestamp":1041379200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/www.karger.com\/Services\/SiteLicenses"},{"start":{"date-parts":[[2003,1,1]],"date-time":"2003-01-01T00:00:00Z","timestamp":1041379200000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/www.karger.com\/Services\/SiteLicenses"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Fetal Diagn Ther"],"published-print":{"date-parts":[[2003]]},"abstract":"<jats:p>&lt;i&gt;Objective:&lt;\/i&gt; Fetal heart rate (FHR) variability is an important indicator of fetal well-being. In fetal tachyarrhythmias, however, visual analysis of FHR variability is limited. We therefore applied power spectral analysis of FHR to evaluate the fetal state. &lt;i&gt;Methods:&lt;\/i&gt; Fetal R-R intervals were detected by means of an external ECG in 3 fetuses with supraventricular extrasystoles after cardiac malformations had been excluded by fetal echocardiography. Using an autoregressive model, power spectral densities were calculated from 20 consecutive 256-beat segments for the following frequency bands: &lt;0.03 Hz (very low frequency), 0.03\u20130.069 Hz (low frequency; LF), 0.07\u20130.129 Hz (mid-frequency) and 0.13\u20131.0 Hz (high frequency; HF). &lt;i&gt;Results: &lt;\/i&gt;The FHR variability in fetal supraventricular extrasystoles mainly resulted from the HF component (63.91 \u00b1 6.97%). The sympatho-vagal balance (LF\/HF) was decreased in the tracings with extrasystoles (0.13). &lt;i&gt;Conclusion:&lt;\/i&gt; The analysis of FHR variability in fetal supraventricular extrasystoles revealed an imbalance between sympathetic and parasympathetic regulation.<\/jats:p>","DOI":"10.1159\/000070811","type":"journal-article","created":{"date-parts":[[2003,7,11]],"date-time":"2003-07-11T08:22:02Z","timestamp":1057911722000},"page":"284-288","source":"Crossref","is-referenced-by-count":6,"title":["Spectral Analysis of Fetal Heart Rate Variability in Fetuses with Supraventricular Extrasystoles"],"prefix":"10.1159","volume":"18","author":[{"given":"Carolyn","family":"Troeger","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Andreas F.","family":"Schaub","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Paolo","family":"Bernasconi","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Irene","family":"H\u00f6sli","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wolfgang","family":"Holzgreve","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"127","published-online":{"date-parts":[[2003,7,4]]},"reference":[{"key":"ref1","doi-asserted-by":"publisher","DOI":"10.1007\/s004170050123"},{"key":"ref2","doi-asserted-by":"publisher","DOI":"10.1016\/0378-3782(93)90179-X"},{"key":"ref3","doi-asserted-by":"publisher","DOI":"10.1016\/S0378-3782(00)00124-9"},{"key":"ref4","doi-asserted-by":"publisher","DOI":"10.1016\/0378-3782(83)90032-4"}],"container-title":["Fetal Diagnosis and Therapy"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.karger.com\/Article\/Pdf\/70811","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/www.karger.com\/Article\/Pdf\/70811","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,4,24]],"date-time":"2025-04-24T03:23:58Z","timestamp":1745465038000},"score":1,"resource":{"primary":{"URL":"https:\/\/karger.com\/article\/doi\/10.1159\/000070811"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2003]]},"references-count":4,"journal-issue":{"issue":"4","published-online":{"date-parts":[[2003,8,1]]}},"URL":"https:\/\/doi.org\/10.1159\/000070811","archive":["Portico"],"relation":{},"ISSN":["1015-3837","1421-9964"],"issn-type":[{"type":"print","value":"1015-3837"},{"type":"electronic","value":"1421-9964"}],"subject":[],"published":{"date-parts":[[2003]]}}}