title: Preclinical evaluation of a novel drug-eluting balloon in an animal model of in-stent stenosis.
abstract: Despite advances in contemporary stent technology, in-stent restenosis (ISR) remains the major limitation following revascularization procedures. We developed a porcine model of ISR to specifically investigate the preclinical outcomes of a novel drug-eluting balloon (DEB) in this particular setting. Fifteen pigs received bare metal stents in each of the major coronary arteries for 28 days to induce neointimal growth. Following repeat angiography, animals were allocated to fourdifferent treatment groups. The control group consisted of a bare angioplasty catheter, while the Pantera Lux™ (3.0 µg/mm(2) paclitaxel) (30 s inflation) was compared to two consecutive deployments of the Pantera Lux™ (60 s inflation each) and the commercial SeQuent(®) Please balloon (60 s inflation). Twenty-eight days following balloon deployment, the animals underwent repeat angiography and were subsequently sacrificed for histopathologic assessment. There was a trend in reduction of percent diameter stenosis in the DEB group versus control (13.9% vs. 20.4%), while longer inflation duration or consecutive DEB deployment had no additional growth-limiting effect. Neointimal thickness was reduced from 0.38 ± 0.13 to 0.30 ± 0.09 mm in the control versus DEB group. All DEB groups showed delayed vascular healing characterized by dose-dependent increases in fibrin deposition and neointimal cell vacuity. Investigation of DEB in a porcine model of ISR is feasible and more accurately represents human disease conditions. The magnitude of neointima suppression is lower than that observed in non-diseased animal models and is accompanied by delayed vascular healing.
authors.affiliation: Deutsches Herzzentrum München, Klinik an der Technischen Universität München, Germany. michaeljoner@me.com
authors.forename: Michael
authors.initials: M
authors.lastname: Joner
authors.forename: Peter W
authors.initials: PW
authors.lastname: Radke
authors.forename: Robert A
authors.initials: RA
authors.lastname: Byrne
authors.forename: Sonja
authors.initials: S
authors.lastname: Hartwig
authors.forename: Kristin
authors.initials: K
authors.lastname: Steigerwald
authors.forename: Guy
authors.initials: G
authors.lastname: Leclerc
authors.forename: Eric
authors.initials: E
authors.lastname: Wittchow
mesh_terms: D015906:Angioplasty, Balloon, Coronary / Q000295:instrumentation*; D000818:Animals; D023903:Coronary Restenosis / Q000188:drug therapy* / Q000473:pathology / Q000628:therapy*; D003331:Coronary Vessels / Q000187:drug effects / Q000473:pathology; D004195:Disease Models, Animal; D016503:Drug Delivery Systems; D005260:Female; D006801:Humans; D058426:Neointima / Q000188:drug therapy / Q000473:pathology; D017239:Paclitaxel / Q000008:administration & dosage*; D015607:Stents / Q000009:adverse effects*; D013552:Swine; D013556:Swine, Miniature; D014945:Wound Healing
chemical_list: D017239:Paclitaxel