Document Detail


Altered hemodynamics in chick embryos after extraembryonic venous obstruction.
MedLine Citation:
PMID:  10423809     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVE: To obtain insight into hemodynamics during abnormal cardiac development, a chick model was developed recently in which a spectrum of conotruncal anomalies, in combination with abnormal semilunar valves and/or pharyngeal arch artery malformations, was induced through extraembryonic venous obstruction (venous clip) at stage 17 (70-h incubation). METHODS: In chick embryos of stage 24 and stage 34 control (n = 8; n = 21) and with venous clip (n = 11; n = 18), we simultaneously measured dorsal flow velocities with a 20-MHz pulsed Doppler velocity meter and dorsal aortic (stage 24) and vitelline artery (stage 34) blood pressures with a servo-null system. After the hemodynamic recordings were collected, all 58 embryos were subjected to morphological examination. The hemodynamic data were correlated with the morphology. Statistical comparison was performed between control and experimental values. RESULTS: At stage 24, venous clip embryos showed impaired looping. Physiologically, only a decrease in peak acceleration was found in these embryos (p < 0.05). At stage 34, a spectrum of conotruncal malformations was seen, that consisted of a ventricular septal defect in combination with abnormal semilunar valves and/or pharyngeal arch malformations. A dextroposed aorta in combination with a ventricular septal defect was diagnosed as double-outlet right ventricle. Hemodynamically, peak systolic and mean velocities, peak systolic and mean blood flows and stroke volume were increased while the heart rate was reduced after placement of the venous clip (p < 0.05). In both stages, pressure readings showed no statistically significant differences between control and experimental embryos. CONCLUSION: Our findings suggest that the hemodynamic changes seen in venous clip embryos reflect the presence of a compensatory mechanism.
Authors:
M L Broekhuizen; B Hogers; M C DeRuiter; R E Poelmann; A C Gittenberger-de Groot; J W Wladimiroff
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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:  13     ISSN:  0960-7692     ISO Abbreviation:  Ultrasound Obstet Gynecol     Publication Date:  1999 Jun 
Date Detail:
Created Date:  1999-09-08     Completed Date:  1999-09-08     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  9108340     Medline TA:  Ultrasound Obstet Gynecol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  437-45     Citation Subset:  IM    
Affiliation:
Department of Obstetrics and Gynecology, Academic Hospital Rotterdam, Erasmus University, The Netherlands.
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MeSH Terms
Descriptor/Qualifier:
Animals
Blood Flow Velocity
Cardiac Output
Chick Embryo
Disease Models, Animal
Heart / embryology*
Heart Defects, Congenital / physiopathology*
Hemodynamics
Time Factors
Vascular Diseases / physiopathology

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


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