Volume 23, Issue 8 pp. 637-645
Original Article

Influence of stent implantation on erythrocyte aggregation in human native coronary arteries and saphenous vein grafts

Theodor Baars

Theodor Baars

Institute for Pathophysiology, West German Heart and Vascular Centre Essen, University of Essen Medical School, Essen, Germany

Institute for Clinic of Cardiology, West German Heart and Vascular Centre Essen, University of Essen Medical School, Essen, Germany

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Philipp Kahlert

Philipp Kahlert

Institute for Clinic of Cardiology, West German Heart and Vascular Centre Essen, University of Essen Medical School, Essen, Germany

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Albert Baars

Albert Baars

Department of Biomimetics, Hochschule of Bremen, City University of Applied Science, Bremen, Germany

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Heike Preibsch

Heike Preibsch

Diagnostic and Interventional Radiology, University Hospital Tuebingen, Tuebingen, Germany

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Tienush Rassaf

Tienush Rassaf

Institute for Clinic of Cardiology, West German Heart and Vascular Centre Essen, University of Essen Medical School, Essen, Germany

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Gerd Heusch

Gerd Heusch

Institute for Pathophysiology, West German Heart and Vascular Centre Essen, University of Essen Medical School, Essen, Germany

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Petra Kleinbongard

Corresponding Author

Petra Kleinbongard

Institute for Pathophysiology, West German Heart and Vascular Centre Essen, University of Essen Medical School, Essen, Germany

Correspondence

Petra Kleinbongard, Institut für Pathophysiologie, Westdeutsches Herz- und Gefäßzentrum, Universitätsklinikum Essen, Essen, Germany.

Email: [email protected]

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First published: 13 October 2016
Citations: 6

Funding Information:

This work was supported by the Dr. Heinz-Horst Deichmann Foundation.

Abstract

Objective

Stent implantation into atherosclerotic coronary vessels induces the release of particulate debris and soluble vasoactive substances, which impair downstream microvascular function. Microvascular perfusion, however, is also determined by hemorheological parameters. We therefore analyzed now changes in erythrocyte (RBC) aggregation in coronary arterial blood during stent implantation.

Methods

Symptomatic male patients with stable angina pectoris and stenosis in their native right coronary artery (RCA) or saphenous vein graft on right coronary artery (SVG-RCA) were enrolled. Coronary arterial blood was taken before and coronary aspirate during stent implantation with a distal occlusion/aspiration device. RBC aggregation was determined using the erythrocyte adhesiveness/aggregation test. The ratio of clot-free area to whole area of a spread blood drop was quantified (rCFA). To evaluate the impact of soluble factors within aspirate plasma on RBC aggregation, separated RBCs of healthy volunteers were exposed to patients' coronary arterial blood and aspirate samples.

Results

rCFA was comparably increased in coronary aspirate of RCAs and SVG-RCAs after stent implantation (RCA: 25.7±2.1% vs 32.2±2.1%; SVG-RCA: 28.9±1.9% vs 33.3±2.0%, P<.01). The rCFA of healthy volunteers was increased after adding coronary aspirate plasma.

Conclusions

Stent implantation into atherosclerotic coronary arteries induces an increase in RBC aggregation, potentially contributing to impaired microvascular perfusion.

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