Abstract
Backgrounds: Acute kidney injury (AKI) during heart failure treatment is associated with poor outcome in patients admitted with acute decompensated heart failure (ADHF). In patients with ADHF,increased uric acid (UA) level is also a prognostic marker, but there is no information available on the long-term prognostic significance of UA in-hospital change, relating to AKI in patients admitted for ADHF. Methods and Results: We studied 237 patients admitted with ADHF and discharged with survival. The measurements of serum UA and creatinine (Cr) levels were repeated during hospitalization, and the change of UA was obtained by subtracting the value at admission or discharge from the maximum value. AKI was defined according to AKI Network criteria (stage 1, ≥0.3mg/dl absolute or 1.5-to 2.0-fold relative increase in Cr; stage 2, >2- to 3-fold increase in Cr; stage 3, >3-fold increase in Cr or Cr≥4.0mg/dl with an acute rise of ≥0.5mg/dl). During a follow-up period of 4.3±3.3 yrs, 59 patients had cardiovascular death (CVD). At multivariate Cox analysis, UA change (p=0.02) and stage 2 or 3 AKI (p=0.01) were significantly associated with CVD, independently of age, systolic blood pressure, serum sodium, hemoglobin, UA and Cr levels, although stage 1 AKI showed no significant association with CVD. Patients with both higher degree of UA change (top quartile:≥4.4 mg/dl) and stage 2 or 3 AKI had a significant increased CVD risk, compared to patients with either higher UA change or stage 2 or 3 AKI (75% vs 34%, p=0.006, hazard ratio 3.8[95%CI 1.4-8.6]). Furthermore, patients with either higher UA change or stage 2 or 3 AKI also had a significant increased CVD risk, compared to patients with none of these two variables (34% vs 19%, p=0.01, hazard ratio 2.0[95%CI 1.1-3.5]). Conclusion: Uric acid in-hospital change could provide the additional long-term prognostic information to moderate to severe AKI in patients admitted for ADHF.
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