Predictors of failure after angioplasty of infrainguinal vein bypass grafts

Abstract

Percutaneous transluminal angioplasty (PTA) has had an expanding role as primary therapy for vein graft stenosis with variable results. The aim of this study is to identify patient and graft characteristics predictive of failure after PTA of infrainguinal vein grafts. Retrospective review from Jan 2004 to Mar 2007 of patients undergoing angioplasty for failing grafts. Demographics, comorbidities, procedural data, and follow-up information were recorded. PTA failure was defined as first significant event including restenosis by duplex scan (>3.5 x velocity ratio), occlusion, redo-PTA, surgical revision, or amputation. Descriptive, logistic regression and life-table analyses were performed. Eighty-seven grafts in 79 patients underwent PTA. Mean age was 70 years (median 70; range, 39-89 years), 71% were male and 52% were symptomatic (40% with limb-threat). Mean follow-up was 17 months (median 17.4; range, 0.03-39.8 months). Freedom from PTA failure was 58% (standard error [SE] 0.0574) at 12 months. Predictors of PTA failure by multivariate analysis were: time from bypass <3 months (hazard ratio [HR] 5.8; 95% confidence interval [CI] 1.91-18.0; P = .002), stenosis length >2 cm (HR 2.7; 95% CI 1.33-5.83; P = .007) and multiple stenoses (HR 2.5; 95% CI 1.29-5.1; P = .007). PTA patency for grafts with favorable lesions (single, less than 2 cm lesions in grafts older than 3 months) was 71% vs 35% for unfavorable lesions at 12 months. Limb-salvage was 95% and 90% and overall survival was 92% and 81% at 12 and 24 months, respectively. PTA of failing infrainguinal vein grafts is a reasonable primary therapy for favorable lesions. Early graft stenosis, long, and multiple stenoses are markers for procedural failure and are better served with surgical revision.