Document Detail


Uterine artery blood flow velocity waveforms during uterine contractions.
MedLine Citation:
PMID:  14689529     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVE: No quantitative or qualitative Doppler velocimetry classification of vascular flow resistance covering all stages of forward and reversed flows exists. The objective of this study was to characterize uterine artery (UtA) flow velocity waveforms (FVWs) obtained during an oxytocin challenge test (OCT) and compare them to FVWs in spontaneous normal labor. METHODS: Uterine artery Doppler velocimetry was performed during and between uterine contractions in 61 high-risk pregnancies subjected to an OCT and in 20 normal pregnancies undergoing spontaneous labor. FVWs were classified relative to the presence of forward/absent/reversed flow during systole and diastole, and the time-averaged flow velocity over the heart cycle. RESULTS: Eleven different FVW classes were identified. No relationship between FVWs recorded during uterine inertia and contractions was found (P >/= 0.2). In both groups, only forward FVWs were recorded between contractions, whereas during contractions flow reversal was more common in the OCT group (P </= 0.002). In cases of predominantly reversed flow, a reciprocal relationship to FVW classes recorded in the contralateral artery was found. CONCLUSIONS: UtA FVW patterns recorded during uterine contractions were not predicted by flow patterns recorded during uterine inertia. Reversal of flow direction was more common during oxytocin-induced uterine contractions than during spontaneous contractions. In cases of predominantly reversed flow, domains of the uterus may be supplied by blood from the contralateral UtA. These observations give new insights into the circulatory dynamics of the uterus during labor, and also point to a possible vasoconstrictory effect in the UtAs of oxytocin at high concentrations.
Authors:
H Li; S Gudmundsson; P Olofsson
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology     Volume:  22     ISSN:  0960-7692     ISO Abbreviation:  Ultrasound Obstet Gynecol     Publication Date:  2003 Dec 
Date Detail:
Created Date:  2003-12-22     Completed Date:  2004-03-30     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9108340     Medline TA:  Ultrasound Obstet Gynecol     Country:  England    
Other Details:
Languages:  eng     Pagination:  578-85     Citation Subset:  IM    
Copyright Information:
Copyright 2003 ISUOG. Published by John Wiley & Sons, Ltd.
Affiliation:
Departments of Obstetrics and Gynecology, Malmö University Hospital, Lund University, Malmö, Sweden.
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MeSH Terms
Descriptor/Qualifier:
Arteries / physiology,  ultrasonography
Blood Flow Velocity / drug effects,  physiology
Female
Humans
Oxytocin / diagnostic use
Pregnancy
Pregnancy, High-Risk / physiology
Pulsatile Flow / drug effects,  physiology
Ultrasonography, Doppler
Ultrasonography, Prenatal
Uterine Contraction / physiology*
Uterine Inertia / physiopathology,  ultrasonography
Uterus / blood supply*,  drug effects
Chemical
Reg. No./Substance:
50-56-6/Oxytocin

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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