MICRONUTRIENTS: Edited by Gil Hardy and Henry C. LukaskiMicronutrient and amino acid losses in acute renal replacement therapyOh, Weng C.a,b; Gardner, David S.c; Devonald, Mark A.J.a,cAuthor Information aRenal and Transplant Unit, Nottingham University Hospitals NHS Trust bSchool of Medicine, University of Nottingham cSchool of Veterinary Medicine and Science, University of Nottingham, Nottingham, UK Correspondence to Mark A.J. Devonald, Renal and Transplant Unit, Nottingham University Hospitals NHS Trust – City Campus, Nottingham NG5 1PB, UK. Tel: +44 0 115 9691169 x53186; e-mail: [email protected] Current Opinion in Clinical Nutrition and Metabolic Care: November 2015 - Volume 18 - Issue 6 - p 593-598 doi: 10.1097/MCO.0000000000000220 Buy Metrics Abstract Purpose of review A wide range of renal replacement therapies is now available to support patients with acute kidney injury. These treatments utilize diffusion, convection or a combination of these mechanisms to remove metabolic waste products from the bloodstream. It is inevitable that physiologically important substances including micronutrients will also be removed. Here we review current knowledge of the extent of micronutrient loss, how it varies between treatment modalities and its clinical significance. Recent findings Very few studies have specifically investigated micronutrient loss in renal replacement therapy for acute kidney injury. Recent data suggest that trace elements and amino acids are lost during intermittent dialysis, hybrid therapies such as sustained low-efficiency diafiltration and continuous therapies. Extent of micronutrient loss appears to vary with treatment type, with continuous convection-based treatments probably causing greatest losses. Summary Patients with acute kidney injury are at high risk of disease-related malnutrition. The use of renal replacement therapy, although often essential for life support, results in loss of micronutrients into the filtrate or dialysate. Losses are probably greater with continuous convective treatments, but it is not yet known whether these losses are clinically significant or whether their replacement would improve patient outcomes. Copyright © 2015 Wolters Kluwer Health, Inc. All rights reserved.