C-reactive protein and cardiovascular disease in peritoneal dialysis patients

Abstract

Background. Elevated plasma concentrations of C-reactive protein (CRP) is a risk factor for cardiovascular disease (CVD) in the general population and in hemodialysis patients. The prognostic value of CRP is less well known in peritoneal dialysis (PD) patients. We examined the association between CRP and cardiovascular event (CVE) in a large population of PD patients. Methods. Two hundred and forty patients starting PD were enrolled in this prospective study. The role of CRP was analyzed with respect to other known cardiovascular risk factors. Results. The patients were followed for a mean duration of 41 ± 21 months; the median value of CRP was 7 mg/L. Eighty-nine cardiovascular events (CVE; 37.1%) occurred in 84 patients and the CRP levels were higher in patients who experienced CVE (27 ± 14 vs. 6 ± 8 mg/L; P < 0.0001). In the Cox model, patients in the three lower quartiles of the CRP levels had a decreased risk of CVE compared with those in the highest quartile. Cox regression analysis also revealed that age, a previous history of cardiovascular disease, hyperhomocysteinemia and hypoalbuminemia were risk factors for CVE. CRP levels were higher in patients who died during the study period (25 ± 12 vs. 5 ± 8 mg/L; P = 0.003). In the Cox model, patients with CRP levels above the median had an increased risk of death compared with those in the lowest quartile. Conclusions. Chronic inflammation, as reflected by elevated CRP levels, is frequent in patients starting PD and independently contributes to an increased incidence of CVE in this population.