Abstract:
BACKGROUND/AIMS:The present report examines a new pig model for progressive induction of high-grade stenosis, for the study of chronic myocardial ischemia and the dynamics of collateral vessel growth. METHODS:Thirty-nine Landrace pigs were instrumented with a novel experimental stent (GVD stent) in the left anterior descending coronary artery. Eight animals underwent transthoracic echocardiography at rest and under low-dose dobutamine. Seven animals were examined by nuclear PET and SPECT analysis. Epi-, mid- and endocardial fibrosis and the numbers of arterial vessels were examined by histology. RESULTS:Functional analysis showed a significant decrease in global left ventricular ejection fraction (24.5 +/- 1.6%) 3 weeks after implantation. There was a trend to increased left ventricular ejection fraction after low-dose dobutamine stress (36.0 +/- 6.6%) and a significant improvement of the impaired regional anterior wall motion. PET and SPECT imaging documented chronic hibernation. Myocardial fibrosis increased significantly in the ischemic area with a gradient from epi- to endocardial. The number of arterial vessels in the ischemic area increased and coronary angiography showed abundant collateral vessels of Rentrop class 1. CONCLUSION:The presented experimental model mimics the clinical situation of chronic myocardial ischemia secondary to 1-vessel coronary disease.
journal_name
J Vasc Resjournal_title
Journal of vascular researchauthors
Horstick G,Bierbach B,Abegunewardene N,Both S,Kuhn S,Manefeld D,Reinecke HJ,Vosseler M,Helisch A,Becker D,Lauterbach M,Kempski O,Lehr HAdoi
10.1159/000181545subject
Has Abstractpub_date
2009-01-01 00:00:00pages
290-8issue
4eissn
1018-1172issn
1423-0135pii
000181545journal_volume
46pub_type
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