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Korean J Anesthesiol. 2011 Jul;61(1):35-41. English. Original Article.
Jo YY , Kwak YL , Lee J , Choi YS .
Department of Anesthesiology and Pain Medicine, Gachon University of Medicine and Science Gil Medical Center, Incheon, Korea.
Department of Anesthesiology and Pain Medicine, Yonsei University College of Medicine, Seoul, Korea.
Anesthesia and Pain Research Institute, Yonsei University College of Medicine, Seoul, Korea.

BACKGROUND: Plasma levels of N-terminal pro-B-type natriuretic peptide (NT-proBNP) provide useful prognostic predictors in patients after cardiac surgery. However, predictive accuracy of NT-proBNP levels has varied significantly according to renal dysfunction. The purpose of this study was to assess whether preoperative NT-proBNP levels could be used as predictors of early postoperative outcomes on the basis of renal function in patients undergoing off-pump coronary artery bypass surgery (OPCAB). METHODS: In 219 patients undergoing elective OPCAB, NT-proBNP and an estimated glomerular filtration rate (eGFR) were assessed preoperatively. All patients were divided into 3 groups according to tertiles of eGFR: the first (eGFR > or = 90 ml/min/1.73 m2), the second (90 ml/min/1.73 m2 > eGFR > or = 72 ml/min/1.73 m2) and the third tertile group (eGFR < 72 ml/min/1.73 m2). End point was the composite of early postoperative complications defined as myocardial infarction, new onset atrial fibrillation, ventricular dysfunction, prolonged mechanical ventilator care (> 48 hr), prolonged ICU stay (> or = 3 days), and in hospital mortality. RESULTS: There was no difference in early postoperative complications among groups. A preoperative NT-proBNP level of 228 pg/ml and 302 pg/ml (sensitivity 70%, specificity 67%, P < 0.001 and sensitivity 73%, specificity 63%, P = 0.001, respectively) were optimal cut-off values predicting complicated early postoperative course in second and third tertile group, respectively. CONCLUSIONS: Preoperative NT-proBNP levels seem to be predictive of early postoperative complications in patients with eGFR < 90 ml/min/1.73 m2 undergoing OPCAB.

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