['To identify baseline predictors of worsening renal function (WRF) in an acute decompensated heart failure (ADHF) patient population receiving continuous infusion loop diuretics.', 'Retrospective observational analysis.', 'Academic tertiary medical center.', 'A total of 177 patients with ADHF receiving continuous infusion loop diuretics from January 2006 through June 2009.', 'The mean patient age was 61 years, 63% were male, ~45% were classified as New York Heart Association functional class III, and the median length of loop diuretic infusion was 4 days. Forty-eight patients (27%) developed WRF, and 34 patients (19%) died during hospitalization. Cox regression time-to-event analysis was used to determine the time to WRF based on different demographic and clinical variables. Baseline serum albumin 3 g/dl or less was the only significant predictor of WRF (hazard ratio [HR] 2.87, 95% confidence interval [CI] 1.60-5.16, p=0.0004), which remained significant despite adjustments for other covariates.'] Is baseline albumin associated with worsening renal function in patients with acute decompensated heart failure receiving continuous infusion loop diuretics?