Document Detail

Fetal Doppler velocimetry in the internal carotid and umbilical artery during Braxton Hicks' contractions.
MedLine Citation:
PMID:  1396288     Owner:  NLM     Status:  MEDLINE    
Using Doppler ultrasound, previous studies revealed a considerable increase in vascular resistance in the uteroplacental circulation during Braxton Hicks' contractions. Consequently, uteroplacental blood flow is reduced and this affects placental oxygen transfer to the fetus, causing a fall in fetal arterial PO2. In view of the important role of arterial PO2 in the regulation of cerebral blood flow in the fetus, we hypothesised that Braxton Hicks' contractions cause a decrease in cerebral vascular resistance. A study was undertaken in 16 healthy near term pregnancies, using pulsed-wave Doppler ultrasound to evaluate the influence of Braxton Hicks' contractions on cerebral vascular resistance of the fetus. Flow velocity waveforms (FVWs) were recorded of the fetal internal carotid and umbilical artery and the Pulsatility Index (PI) was calculated. During Braxton Hicks' contractions the PI in the recorded vessels did not change. Fetal heart rate showed also no changes during Braxton Hicks' contractions. These findings indicate that resistance to blood flow downstream of these arteries, is not significantly altered, suggesting that Braxton Hicks' contractions have little or no effect on fetal haemodynamics and on fetal oxygenation in the healthy near term fetus.
H Oosterhof; K Dijkstra; J G Aarnoudse
Related Documents :
10817028 - Prenatal genetic diagnosis from maternal blood: simultaneous immunophenotyping and fish...
6502438 - Heart rate variability and electrocardiogram changes in the fetal lamb during hypoxia a...
1323438 - The effect of graded haemorrhage on erythropoietin production in the immature ovine foe...
2486888 - Fetal blood values by percutaneous umbilical blood sampling.
12170048 - Effects of surgical levels of propofol and sevoflurane anesthesia on cerebral blood flo...
8941918 - Renal cortical and medullary microvascular blood flow autoregulation in rat.
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Early human development     Volume:  30     ISSN:  0378-3782     ISO Abbreviation:  Early Hum. Dev.     Publication Date:  1992 Aug 
Date Detail:
Created Date:  1992-10-29     Completed Date:  1992-10-29     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7708381     Medline TA:  Early Hum Dev     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  33-40     Citation Subset:  IM    
Department of Obstetrics and Gynaecology, State University Hospital, Groningen, Netherlands.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Carotid Artery, Internal / embryology,  ultrasonography*
Cerebrovascular Circulation / physiology*
Fetus / physiology
Rheology / methods*
Ultrasonography, Prenatal / methods*
Umbilical Arteries / embryology,  ultrasonography*
Uterine Contraction / physiology*

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

Previous Document:  Two different low birth weight formulae compared.
Next Document:  Cerebral blood flow fluctuation in low-risk preterm newborns.