Document Detail


Augmented uterine artery blood flow and oxygen delivery protect Andeans from altitude-associated reductions in fetal growth.
MedLine Citation:
PMID:  19244584     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The effect of high altitude on reducing birth weight is markedly less in populations of high- (e.g., Andeans) relative to low-altitude origin (e.g., Europeans). Uterine artery (UA) blood flow is greater during pregnancy in Andeans than Europeans at high altitude; however, it is not clear whether such blood flow differences play a causal role in ancestry-associated variations in fetal growth. We tested the hypothesis that greater UA blood flow contributes to the protection of fetal growth afforded by Andean ancestry by comparing UA blood flow and fetal growth throughout pregnancy in 137 Andean or European residents of low (400 m; European n = 28, Andean n = 23) or high (3,100-4,100 m; European n = 51, Andean n = 35) altitude in Bolivia. Blood flow and fetal biometry were assessed by Doppler ultrasound, and maternal ancestry was confirmed, using a panel of 100 ancestry-informative genetic markers (AIMs). At low altitude, there were no ancestry-related differences in the pregnancy-associated rise in UA blood flow, fetal biometry, or birth weight. At high altitude, Andean infants weighed 253 g more than European infants after controlling for gestational age and other known influences. UA blood flow and O(2) delivery were twofold greater at 20 wk in Andean than European women at high altitude, and were paralleled by greater fetal size. Moreover, variation in the proportion of Indigenous American ancestry among individual women was positively associated with UA diameter, blood flow, O(2) delivery, and fetal head circumference. We concluded that greater UA blood flow protects against hypoxia-associated reductions in fetal growth, consistent with the hypothesis that genetic factors enabled Andeans to achieve a greater pregnancy-associated rise in UA blood flow and O(2) delivery than European women at high altitude.
Authors:
Colleen Glyde Julian; Megan J Wilson; Miriam Lopez; Henry Yamashiro; Wilma Tellez; Armando Rodriguez; Abigail W Bigham; Mark D Shriver; Carmelo Rodriguez; Enrique Vargas; Lorna G Moore
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2009-02-25
Journal Detail:
Title:  American journal of physiology. Regulatory, integrative and comparative physiology     Volume:  296     ISSN:  0363-6119     ISO Abbreviation:  Am. J. Physiol. Regul. Integr. Comp. Physiol.     Publication Date:  2009 May 
Date Detail:
Created Date:  2009-04-28     Completed Date:  2009-06-25     Revised Date:  2013-06-02    
Medline Journal Info:
Nlm Unique ID:  100901230     Medline TA:  Am J Physiol Regul Integr Comp Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  R1564-75     Citation Subset:  IM    
Affiliation:
Altitude Research Center, Department of Surgery, University of Colorado Denver, Aurora, CO 80045-0508, USA. colleen.julian@uchsc.edu
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MeSH Terms
Descriptor/Qualifier:
Adult
Altitude*
American Native Continental Ancestry Group / ethnology,  genetics*
Arteries / physiology*
Biological Transport / genetics,  physiology
Birth Weight / genetics,  physiology
Bolivia / ethnology
Case-Control Studies
Europe / ethnology
European Continental Ancestry Group / ethnology,  genetics
Female
Fetal Development / genetics*,  physiology
Humans
Oxygen / metabolism*
Pregnancy
Regional Blood Flow / genetics*,  physiology
Uterus / blood supply*
Grant Support
ID/Acronym/Agency:
HLBI-079647//PHS HHS; HLBI-60131//PHS HHS; R03 TW007957-03/TW/FIC NIH HHS; TW-01188/TW/FIC NIH HHS
Chemical
Reg. No./Substance:
7782-44-7/Oxygen
Comments/Corrections

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


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