Abstract 3742: Elevated Brain Natriuretic Peptide and C-reactive Protein Interactively Increased Cardiovascular and All-cause Mortality Risk in Hemodialysis Patients
Background: It has been established that elevated brain natriuretic peptide (BNP) and C-reactive protein (CRP) levels are increasingly associated with cardiovascular (CV) morbidity. We examined the prognostic usefulness of combining BNP and CRP for predicting CV mortality in hemodialysis (HD) patients.
Methods: Plasma BNP and serum CRP were measured consecutively in 500 HD patients. These patients were divided into 4 groups according to plasma BNP levels; Quartile 1 (Q1): < 45 ng/L, Q2: 145–266 ng/L, Q3: 267– 628 ng/L, and Q4: >628 ng/L, and serum CRP levels; Q1: <0.09 mg/dl, Q2: 0.09 – 0.27 mg/dl, Q3: 0.27–1.17mg/dl and Q4: >1.17mg/dl, respectively. All patients were followed up for 8 years.
Results: On Cox proportional hazards analysis, hazard ratio (HR) of elevated BNP levels was 3.93 (95%CI 2.06 –7.52 for Q4 vs Q1) for CV mortality and 3.51 (95%CI 2.18 –5.64 for Q4 vs Q1) for all-cause mortality, respectively (both p<0.0001). Similarly, HR of elevated CRP levels was 6.00 (95%CI 2.89 –12.45) for CV mortality and 8.19 (95%CI 4.53–14.77) for all-cause mortality, respectively (both p<0.0001). In the setting of combination of BNP and CRP, the risk of CV mortality was 23.6-fold in the highest quartile on both BNP and CRP compared with the lowest quartile on both BNP and CRP. Similarly, the risk of mortality was 45.3-fold (Figure⇓). These variables were significant after adjustment for other CV risk factors.
Conclusions: Elevated BNP and CRP interactively increased CV and all-cause mortality risk in HD patients. The combination of BNP and CRP is useful for risk stratification in HD patients because the combination of these variables is more closely related to outcome than either variable alone.