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Hypertension induced by episodic reductions in uteroplacental blood flow in gravid rat.
MedLine Citation:
PMID:  20846047     Owner:  NLM     Status:  In-Data-Review    
Background. The etiology of preeclampsia remains unclear. Animal modeling of preeclampsia has been useful; however, no model to date represents episodic changes in uteroplacental blood flow that may occur in preeclampsia. Objective. To develop a gravid rat model characterized by episodic reductions in uteroplacental blood flow. Method. Pregnant Sprague Dawley rats were used and subjected to SHAM, reduced uterine perfusion pressure (RUPP), or aortic occlusion on gestational Day 14. Aortic occlusion surgery consisted of implantation of a silastic vascular occluder around the abdominal aorta and silver clips around the uterine-ovarian arteries. Aortic occlusion animals were subjected to five consecutive days of occlusion (40% reduction) each session lasting 1 h. On Day 21, maternal mean arterial pressure (MAP) and fetal morphology were assessed. For isolated blood vessels, resistance-sized mesenteric arteries were harvested and mounted on a pressure arteriograph. Result. Occluder animals experienced a 10 mmHg rise in MAP as compared to SHAM (p < 0.05), and RUPP MAP was significantly increased as compared to control subjects (p < 0.05). Pups from Occluder animals exhibited a decrease in fetal weight as compared to SHAM (p < 0.05), but an increase in fetal weight as compared to RUPP (p < 0.05). Myogenic reactivity of second-order mesenteric arteries increased in Occluder animals as compared to SHAM (p < 0.05), but were similar to that of RUPP. Conclusion. Episodic reductions in uteroplacental blood flow play a crucial role in the altered vascular reactivity seen in Occluder animals and may represent a new model to investigate the mechanisms associated with episodic reductions in uteroplacental blood flow in pathological pregnancies.
John J Reho; Jennifer Peck; Jacqueline Novak; Rolando J Ramirez
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Publication Detail:
Type:  Journal Article     Date:  2010-09-16
Journal Detail:
Title:  Hypertension in pregnancy : official journal of the International Society for the Study of Hypertension in Pregnancy     Volume:  30     ISSN:  1525-6065     ISO Abbreviation:  Hypertens Pregnancy     Publication Date:  2011  
Date Detail:
Created Date:  2011-03-31     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9421297     Medline TA:  Hypertens Pregnancy     Country:  England    
Other Details:
Languages:  eng     Pagination:  208-20     Citation Subset:  IM    
Program in Integrated Biosciences, The University of Akron, Akron, OH, USA.
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