Persistent Kidney Injury at Hospital Discharge After Cardiac Surgery With Cardiopulmonary Bypass in Patients With Normal Preoperative Serum Creatinine and Normal Estimated Glomerular Filtration Rate

Age≥70 years, higher peak postoperative creatinine within 48 hours, and lower hemoglobin on intensive care unit arrival are associated with persistent acute kidney injury. Strategies to improve hemoglobin on intensive care unit arrival potentially can reduce persistent acute kidney injury. The authors recommend that patients aged≥70 years undergo further renal evaluation for better risk stratification.