Document Detail


Assessment of collateral artery function and growth in a pig model of stepwise coronary occlusion.
MedLine Citation:
PMID:  20952668     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Therapeutic stimulation of collateral artery growth is a promising approach for treatment of cardiovascular diseases. Unfortunately, translation into clinical practice yet remains cumbersome. Cardiovascular physiology and anatomy are major determinants of vascular growth processes. Hence, large-animal models are needed to improve clinical translatability of preclinical research. Furthermore, acute complete occlusions are mostly applied in experimental research, whereas stepwise occlusions are more often observed in human disease. We developed a model of coronary collateral artery growth in which 1) the artery is occluded in a step wise approach, and 2) effects of local treatment can be measured individually for each supplying coronary vessel. A hemodynamically relevant stenosis was created by implantation of a tapered stent at day 0 (d0) in the left circumflex artery (LCX), followed by complete arterial occlusion at day 14 (d14). Fluorescent microspheres were injected for demarcation of perfusion territories at each time point. Three and four weeks after induction of stenosis, collateral conductance measurements were performed for each coronary artery separately using differently labeled fluorescent microspheres. Postmortem angiography after acute LCX occlusion confirmed the presence of preexistent coronary anastomoses in the pig. The tapered stent created a hemodynamically significant stenosis immediately postplacement (fractional flow reserve, 0.70 ± 0.03). Between day 21 and 28, collateral conductance significantly increased in both the left anterior descending (LAD) and the right coronary artery (RCA)-supplied, collateral-dependent territories (LAD d21, 0.77 ± 0.14; LAD d28, 1.35 ± 0.12; RCA d21, 0.88 ± 0.29; RCA d28, 1.70 ± 0.16 ml · min(-1) · g(-1) · 100 mmHg(-1)), indicating collateral artery growth. We here describe a new translational minimally invasive model of coronary collateral artery growth in pigs, according to a defined protocol of LCX-stenosis and subsequent occlusion, allowing preclinical evaluation of arteriogenic therapies.
Authors:
Daphne de Groot; Sebastian Grundmann; Leo Timmers; Gerard Pasterkamp; Imo E Hoefer
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-10-15
Journal Detail:
Title:  American journal of physiology. Heart and circulatory physiology     Volume:  300     ISSN:  1522-1539     ISO Abbreviation:  Am. J. Physiol. Heart Circ. Physiol.     Publication Date:  2011 Jan 
Date Detail:
Created Date:  2011-01-04     Completed Date:  2011-01-28     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100901228     Medline TA:  Am J Physiol Heart Circ Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  H408-14     Citation Subset:  IM    
Affiliation:
UMC Utrecht, Experimental Cardiology, G02.523, Heidelberglaan 100, NL-3584 CX Utrecht, The Netherlands. d.degroot-2@umcutrecht.nl
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MeSH Terms
Descriptor/Qualifier:
Animals
Arteries / physiopathology*
Collateral Circulation / physiology*
Coronary Circulation / physiology
Coronary Occlusion / physiopathology*
Coronary Vessels / physiopathology*
Disease Models, Animal*
Immunohistochemistry
Stents
Swine

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


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