Outcomes of severe limb ischemia with tissue loss and impact of revascularization in haemodialysis patients with wound, ischemia, and foot infection (WIfI) stage 3 or 4

Abstract

Summary. Background: With growing prevalence, end-stage renal disease (ESRD) as well as critical limb ischemia (CLI) are both conditions associated with high morbidity and mortality rates. Patients and methods: A retrospective single-centre study provided data of a German interdisciplinary vascular centre. Seventy-seven consecutive haemodialysis (HD) inpatients (median age, 73.6 years) with 91 threatened limbs with Wound, Ischemia, and foot Infection (WIfI) clinical stage 3 or 4 were evaluated for in-hospital treatment of peripheral arterial disease, limb salvage rates, major amputation (MA)-free and overall survival. Results: The 1-year MA-free limb salvage rate was 82 %. On multivariate analysis, a higher WIfI clinical stage (hazard ratio [HR], 7.54; p = 0.008) indicated a higher risk of MA, while at least one-vessel run-off to the foot after revascularization of any kind was associated with a lower risk of MA (HR, 0.17; p = 0.001). In the composite endpoint analysis, the 1-year MA-free overall survival rate was 65 %. Patients with limbs in WIfI clinical stage 4 versus stage 3 carried a more than two-fold increased hazard of death or MA (HR, 2.63; p = 0.028), while revascularization was associated with reduced risk (HR, 0.40; p = 0.021). One-year overall survival (78 %) was not associated with WIfI stage or revascularization but was worse in patients with previous symptomatic coronary artery disease (HR, 3.25; p = 0.039). During long-term follow-up over 12 years, MA-free survival probability was significantly lower in the WIfI stage 4 versus WIfI stage 3 group (HR, 1.58; p = 0.048) without significant differences in overall survival (HR, 1.10; p = 0.696). Conclusions: Lower-extremity CLI with tissue loss in HD patients is associated with high morbidity and mortality rates. WIfI clinical stage was predictive of 1-year MA-free survival, while revascularization significantly reduced MA risk but did not influence overall survival.