Risk stratification for subclavian artery angioplasty: is there an increased rate of restenosis after stent implantation?

Abstract

To compare long-term patency after balloon angioplasty of stenotic or occluded subclavian arteries with and without adjunctive stenting and to identify independent risk factors for restenosis after balloon angioplasty. In a retrospective cohort study, 115 consecutive patients (65 women; mean age 60 years, interquartile range 53-68) who underwent PTA for atherosclerotic subclavian artery obstruction within a 15-year period were included. Among these, 26 (23%) consecutive patients had Palmaz stents routinely implanted since 1996. Follow-up investigation was performed in the year 2000. Patency during the median 44-month follow-up period (interquartile range 18-69 months, minimum 12) was evaluated by oscillography, blood pressure measurement, and color-coded duplex sonography. The predictive value of possible risk factors for restenosis was assessed in a multivariate model controlling for cardiovascular comorbidities and angiographic data. PTA success was achieved in 98 (85%) patients, 72 (81%) of 89 undergoing angioplasty alone and all 26 with stents. Complete occlusion of the vessel and long lesions (> or = 2 cm) correlated with a lower success rate. One-year patency was 76% in unstented arteries and 95% in stented lesions due to better primary technical success, but at 4 years, the patency rates were 59% in arteries with stents and 68% in arteries without. Long lesions, residual stenosis after PTA, and stent implantation were independent predictors for restenosis after successful intervention. Subclavian arterial stent implantation is associated with better 1-year patency than PTA due to improved technical success, but intermediate and long-term outcomes are less favorable, as instent restenosis frequently occurs.