| Popis: |
Background Vascular wall shear stress (WSS) has been implied in the pathogenesis of atherosclerosis and vascular remodeling. Our aim was to calculate WSS after balloon angioplasty and evaluate its predictive value for long-term outcome. Methods wss was calculated proximal to, in, and distal to the lesion after angiographically successful balloon dilatation and at follow-up with the Hagen-Poiseuille formula (WSS = 4muQ/pirR(3)) in 202 patients. Volumetric blood flow (Q) and lumen radius (R) were derived from Doppler scanning velocities and videodensitometric cross-sectional areas. Results Postprocedural proximal and in-lesion values were higher in vessels that developed restenosis (n = 72; 1.22 +/- 0.61 N/m(2) and 3.61 +/- 2.38 N/m(2), respectively) than in those without restenosis (n = 130, 1.05 +/- 0.51 N/m(2) and 2.46 +/- 1.39 N/m(2), respectively; P Conclusions wss in the lesion after balloon angioplasty is predictive of angiographic restenosis. Moreover, the proximal value is an independentpredictor of target lesion revascularization. This study opens perspectives for the on-line use of WSS as a combined parameter of anatomy and physiology to assess the necessity of adjunctive therapy after successful balloon dilatation. |
