Abstract
Background and Aims
Although lower extremity revascularization has been commonly performed in chronic haemodialysis (HD) patients with peripheral artery disease (PAD), poorer prognosis still remains major problems in such population. Recently, protein-energy wasting (PEW) or malnutrition have been considered to be strongly associated with chronic inflammation and advanced atherosclerosis in HD patients. We investigated the association of geriatric nutritional risk index (GNRI) as a surrogate marker of the PEW, C-reactive protein (CRP) and these joint role with prediction of amputation and/or mortality after lower extremity revascularization in chronic HD patients.
Method
We enrolled a total of 862 HD patients (age 67±10 years, diabetes 62.9%, critical limb ischemia 53.5%) who successfully underwent lower extremity revascularization (552 with endovascular therapy and 310 with bypass surgery). Patients were divided into tertiles according to GNRI levels; tertile 1 (T1): <80.0, T2: 80.0-96.6and T3: >96.6, and CRP levels; T1: <2.0mg/l, T2: 2.0-12.6mg/l and T3: >12.6mg/l, respectively. They were followed up for up to 8 years.
Results
During follow-up period (median: 43 months), 63 (7.3%) patients needed major amputation and 202 (23.4%) patients died. Kaplan-Meier analysis shows that amputation-free survival rates for 8 years were 47.5%, 51.6% and 66.5% in T1, T2 and T3 of GNRI, and were 65.8%, 58.7% and 33.2% in T1, T2 and T3 of CRP, respectively (p<0.0001 in both). After adjustment for age, previous coronary artery disease and critical limb ischemia as covariates with p<0.05 by univariate analysis, declined GNRI [hazard ratio (HR) 2.18, 95% confidence interval (CI) 1.57-3.07, p<0.0001 for T1 vs. T3] and elevated CRP (HR 1.78, 95%CI 1.24-2.59, p=0.0016 for T3 vs. T1) were identified as independent predictors of amputation and/or mortality. In the combined setting of both variables, the risk of amputation and/or mortality was 3.77-fold higher (95%CI 1.97-7.69, p<0.0001) in theT1 of GNRI with T3 of CRP than in the T3 of GNRI with T1 of CRP. Similar results were obtained for amputation and mortality, respectively (Figure).
Conclusion
Among HD patients undergoing lower extremity revascularization, those with pre-procedural declined GNRI and elevated CRP frequently experienced amputation and/or mortality, furthermore, combination of both variables could stratify the risk of amputation and/or mortality.
Outcomes After Open Lower Extremity Revascularization for Patients With Critical Limb Ischemia and Previous Interventions
