The complications resulting from coronary stenting are partly caused by alterations/disturbances in fluid dynamics of the arterial flow. To characterize flow within stented left anterior descending arteries at physiological rest conditions, an in vitro pulsatile flow loop and a micro-particle image velocimetry (PIV) system are developed. The highest and lowest velocities occur at the pumping period peak and the pump relaxation period commencement, respectively. Flow reversal exists at the start of pump relaxation. Recirculation regions at the stent leading and trailing edges and at edges of stent slots correlate to platelet deposition areas. The measured wall shear stresses are 5–15 dynes/cm2, which may inhibit re-endothelialization.

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