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https://doi.org/10.1007/s00380-016-0855-5
Copy DOIJournal: Heart and Vessels | Publication Date: Jun 6, 2016 |
Citations: 4 |
Cardiopulmonary bypass usage provokes a systemic inflammatory response resulting in deterioration of renal function. However, risk factors for requiring renal replacement therapy (RRT) following off-pump coronary artery bypass graft surgery (CABG) have not yet been fully elucidated. We reviewed 718 consecutive patients undergoing elective off-pump CABG at our institution, excluding patients on chronic hemodialysis preoperatively. Sub-analysis of patients with preserved renal function, defined as a creatinine level below a cut-off value of 1.12mg/dL (obtained by receiver operating characteristic curve), was also performed. Of the 718 patients, 41 (5.7%) required RRT. There were 556 patients (77.4%) with preserved renal function preoperatively, and 13 (2.4%) of these required postoperative RRT. Multivariate analysis revealed that age (years) and preoperative serum creatinine (mg/dL) and brain natriuretic peptide (BNP) levels (pg/dL) were associated with RRT [odds ratios (OR) 1.052, 95% confidence interval (CI) 9.064 and 1.001, respectively, all p<0.05] in the total population, whereas low albumin concentration was the only independent predictor for RRT in patients with preserved renal function (OR 0.062, p<0.0001). When creatinine levels were below 1.5mg/dL, the predictive power of hypoalbuminemia for RRT requirement overwhelmed that of creatinine or BNP levels. Older age, preoperative elevated creatinine and BNP levels were associated with a requirement for RRT following off-pump CABG. In patients with preserved renal function, hypoalbuminemia was most significantly related to the RRT requirement.
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