This Article Full Text Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Request Permissions Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Oltrona, L. Articles by Abendschein, D. R. Search for Related Content PubMed PubMed Citation Articles by Oltrona, L. Articles by Abendschein, D. R. Pubmed/NCBI databases Substance via MeSH Medline Plus Health Information Blood Thinners

(Circulation. 1997;96:646-652.)
© 1997 American Heart Association, Inc.

Articles

Inhibition of Tissue Factor–Mediated Coagulation Markedly Attenuates Stenosis After Balloon-Induced Arterial Injury in Minipigs

Luigi Oltrona, MD; Christopher M. Speidel, MD; Dino Recchia, MD; Samuel A. Wickline, MD; Paul R. Eisenberg, MD; ; Dana R. Abendschein, PhD

From the Cardiovascular Division, Washington University School of Medicine, St Louis, Mo, and II Divisione Cardiologica, Ospedale Niguarda, Milano, Italy (L.O.).

Correspondence to Dana R. Abendschein, PhD, Cardiovascular Division, Washington University School of Medicine, 660 S Euclid Ave, Box 8086, St Louis, MO 63110.

Background Exposure and upregulation of tissue factor in the wall of balloon-injured arteries may result in prolonged activation of coagulation contributing to restenosis. This study was designed to determine whether brief or more prolonged inhibition of tissue factor–mediated coagulation with tissue factor pathway inhibitor (TFPI) attenuates neointimal formation and luminal stenosis after balloon-induced arterial injury.

Methods and Results The carotid artery of minipigs fed an atherogenic diet was injured by repetitive balloon hyperinflations, a procedure that rapidly yields complex, plaque-like neointimal lesions and high-grade luminal stenosis. Recombinant TFPI (rTFPI) was administered intravenously beginning 15 minutes before balloon injury as either a high dose (0.5 mg/kg bolus and 100 µg·kg^-1·min^-1) for 3 hours (n=7) or 24 hours (n=6) or as a low dose (0.5 mg/kg and 25 µg·kg^-1·min^-1) for 24 hours (n=6). Control animals received intravenous heparin (100 U·kg^-1·h^-1) for 3 hours (n=6) or 24 hours (n=7) or aspirin (5 mg/kg PO) followed by heparin for 24 hours (n=7). Luminal stenosis, assessed histologically 4 weeks after injury, was 73±17% and 76±18% (mean±SEM) in animals that received rTFPI or heparin for 3 hours, respectively. In contrast, luminal stenosis was only 11±12% and 6±3% in pigs given high and low doses, respectively, of rTFPI for 24 hours compared with 46±22% in pigs given heparin for 24 hours and 40±19% in those given both heparin and aspirin (P<.0002).

Conclusions Inhibition of tissue factor–mediated coagulation during the first 24 hours after deep arterial injury appears to be particularly effective for attenuating subsequent neointimal formation and stenosis.

Key Words: thrombosis • coagulation • angioplasty • stenosis