| Uterine artery flow velocity waveforms during uterine contractions: differences between oxytocin-induced contractions and spontaneous labor contractions. | |
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MedLine Citation:
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PMID: 20149031 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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AIM: To clarify the effects on uterine arterial flow velocity waveforms of uterine contractions following oxytocin infusion and during spontaneous labor. METHODS: Uterine arterial flow velocity waveforms were obtained by pulsed Doppler methods from 22 women during an oxytocin challenge test (OCT), 26 women during oxytocin-induced labor, and 40 women during spontaneous labor. Mean resistance index (RI) for bilateral arteries was used for analyses. After the onset of labor, flow velocity waveforms were assessed according to cervical dilatation. During OCT, Doppler flow velocimetry was performed when three uterine contractions occurred per 10-min period. RESULTS: RI values did not differ significantly between induced and spontaneous labor during relaxations at any level of cervical dilatation. However, during contractions, RI was significantly higher for induced labor than for spontaneous labor. Absence or reversal of flow was more frequent in the OCT group than in the induced labor group (P < 0.0001). However, no significant differences were found between spontaneous and induced labor groups. CONCLUSION: Interactions between the contracting uterine body and the relaxing lower segment in oxytocin-induced labor might be associated with differences in uterine arterial flow during contraction between oxytocin-induced and spontaneous labor. However, changes in the intensity of uterine contractions during labor progression might differ between oxytocin-induced and spontaneous labor. |
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Authors:
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Mie Tahara; Yuichiro Nakai; Tomoyo Yasui; Sachiyo Nishimoto; Akemi Nakano; Makiko Matsumoto; Hiroyuki Nobeyama; Rika Nishihara; Naoko Iwanaga; Osamu Ishiko |
Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The journal of obstetrics and gynaecology research Volume: 35 ISSN: 1447-0756 ISO Abbreviation: J. Obstet. Gynaecol. Res. Publication Date: 2009 Oct |
Date Detail:
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Created Date: 2010-02-12 Completed Date: 2010-05-03 Revised Date: 2012-01-19 |
Medline Journal Info:
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Nlm Unique ID: 9612761 Medline TA: J Obstet Gynaecol Res Country: Australia |
Other Details:
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Languages: eng Pagination: 850-4 Citation Subset: IM |
Affiliation:
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Department of Obstetrics and Gynecology, Graduate School of Medicine, Osaka City University, Osaka, Japan. rxv13436@nifty.ne.jp [corrected] |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Blood Flow Velocity / drug effects, physiology Delivery, Obstetric Female Humans Oxytocics / pharmacology Oxytocin / pharmacology* Pregnancy Uterine Artery / drug effects*, physiology*, ultrasonography Uterine Contraction / drug effects*, physiology* |
| Chemical | |
Reg. No./Substance:
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0/Oxytocics; 50-56-6/Oxytocin |
| Comments/Corrections | |
Erratum In:
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J Obstet Gynaecol Res. 2010 Feb;36(1):217 |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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