Fig. 1From: Preoperative NT-proBNP and LVEF for the prediction of acute kidney injury after noncardiac surgery: a single-centre retrospective studyFlow chart of patient selection. Abbreviations: NT-proBNP N-terminal pro-brain natriuretic peptide, LVEF Left ventricular ejection fraction, SMUNH Southern Medical University Nanfang HospitalBack to article page