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Angiology
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Wall Shear Stress Measurement Using Phase Contrast Magnetic Resonance Imaging With Phase Contrast Magnetic Resonance Angiography in Arteriovenous Polytetrafluoroethylene Grafts

Sanjay Misra, MD

Department of Radiology, Division of Vascular and Interventional Radiology, Mayo Clinic College of Medicine, Rochester Minnesota, Misra.sanjay{at}mayo.edu

Alex A. Fu, PhD

Department of Radiology, Division of Vascular and Interventional Radiology, Mayo Clinic College of Medicine, Rochester Minnesota

Khamal D. Misra, BS

Department of Radiology, Division of Vascular and Interventional Radiology, Mayo Clinic College of Medicine, Rochester Minnesota

James F. Glockner, MD, PhD

Department of Biochemistry and Molecular Biology Mayo Clinic College of Medicine, Rochester Minnesota

Debabrata Mukhopadhyay, PhD

Department of Biochemistry and Molecular Biology, Mayo Clinic College of Medicine, Rochester Minnesota

Purpose: The purpose of the present article was to determine the changes in luminal vessel area, blood flow, and wall shear stress in both the inflow artery and the venous stenosis of arteriovenous polytetrafluoroethylene (PTFE) grafts. Methods and materials: Polytetrafluoroethylene grafts were placed from the carotid artery to the ipsilateral jugular vein in 8 castrated juvenile male pigs. Contrast-enhanced magnetic resonance angiography (MRA) with cine phase-contrast magnetic resonance imaging (MRI) was performed 2 weeks after graft placement. Results: The mean wall shear stress at the venous stenosis was 4 times higher than the control vein, while the inflow artery was only 2-fold higher. By day 14, venous stenosis had formed, which was characterized by narrowed area and elevated blood flow. Conclusion: By day 14, there is venous stenosis formation in porcine arteriovenous PTFE grafts with increased shear stress with decreased area when compared to control vein.

Key Words: hemodialysis graft failure • animal models • MRI • shear stress

This version was published on August 1, 2009

Angiology, Vol. 60, No. 4, 441-447 (2009)
DOI: 10.1177/0003319709335908
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