Faculty Collaboration Database

Stent implantation alters coronary artery hemodynamics and wall shear stress during maximal vasodilation. J Appl Physiol (1985) 2002 Dec;93(6):1939-46

Date

10/23/2002

Pubmed ID

12391052

DOI

10.1152/japplphysiol.00544.2002

Scopus ID

2-s2.0-0036893231 (requires institutional sign-in at Scopus site)   54 Citations

Abstract

Coronary stents improve resting blood flow and flow reserve in the presence of stenoses, but the impact of these devices on fluid dynamics during profound vasodilation is largely unknown. We tested the hypothesis that stent implantation affects adenosine-induced alterations in coronary hemodynamics and wall shear stress in anesthetized dogs (n = 6) instrumented for measurement of left anterior descending coronary artery (LAD) blood flow, velocity, diameter, and radius of curvature. Indexes of fluid dynamics and shear stress were determined before and after placement of a slotted-tube stent in the absence and presence of an adenosine infusion (1.0 mg/min). Adenosine increased blood flow, Reynolds (Re) and Dean numbers (De), and regional and oscillatory shear stress concomitant with reductions in LAD vascular resistance and segmental compliance before stent implantation. Increases in LAD blood flow, Re, De, and indexes of shear stress were observed after stent deployment (P < 0.05). Stent implantation reduced LAD segmental compliance to zero and potentiated increases in segmental and coronary vascular resistance during adenosine. Adenosine-induced increases in coronary blood flow and reserve, Re, De, and regional and oscillatory shear stress were attenuated after the stent was implanted. The results indicate that stent implantation blunts alterations in fluid dynamics during coronary vasodilation in vivo.

Author List

LaDisa JF Jr, Hettrick DA, Olson LE, Guler I, Gross ER, Kress TT, Kersten JR, Warltier DC, Pagel PS

Author

John F. LaDisa PhD Professor in the Pediatrics department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Adenosine
Anesthesia
Animals
Blood Flow Velocity
Coronary Circulation
Dogs
Female
Laser-Doppler Flowmetry
Male
Stents
Stress, Mechanical
Vascular Resistance
Vasodilation
Vasodilator Agents