Document Detail

Uterine artery flow velocity waveforms during uterine contractions: differences between oxytocin-induced contractions and spontaneous labor contractions.
MedLine Citation:
PMID:  20149031     Owner:  NLM     Status:  MEDLINE    
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.
Mie Tahara; Yuichiro Nakai; Tomoyo Yasui; Sachiyo Nishimoto; Akemi Nakano; Makiko Matsumoto; Hiroyuki Nobeyama; Rika Nishihara; Naoko Iwanaga; Osamu Ishiko
Publication Detail:
Type:  Journal Article    
Journal Detail:
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:
Created Date:  2010-02-12     Completed Date:  2010-05-03     Revised Date:  2012-01-19    
Medline Journal Info:
Nlm Unique ID:  9612761     Medline TA:  J Obstet Gynaecol Res     Country:  Australia    
Other Details:
Languages:  eng     Pagination:  850-4     Citation Subset:  IM    
Department of Obstetrics and Gynecology, Graduate School of Medicine, Osaka City University, Osaka, Japan. [corrected]
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MeSH Terms
Blood Flow Velocity / drug effects,  physiology
Delivery, Obstetric
Oxytocics / pharmacology
Oxytocin / pharmacology*
Uterine Artery / drug effects*,  physiology*,  ultrasonography
Uterine Contraction / drug effects*,  physiology*
Reg. No./Substance:
0/Oxytocics; 50-56-6/Oxytocin
Erratum In:
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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