Prevention and Treatment of Protein Energy Wasting in Chronic Kidney

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Prevention and Treatment of Protein Energy Wasting in Chronic Kidney review http://www.kidney-international.org & 2013 International Society of Nephrology Prevention and treatment of protein energy wasting in chronic kidney disease patients: a consensus statement by the International Society of Renal Nutrition and Metabolism T. Alp Ikizler1, Noel J. Cano2, Harold Franch3, Denis Fouque4, Jonathan Himmelfarb5, Kamyar Kalantar-Zadeh6, Martin K. Kuhlmann7, Peter Stenvinkel8, Pieter TerWee9, Daniel Teta10, Angela Yee-Moon Wang11 and Christoph Wanner12 1Division of Nephrology, Department of Medicine, Vanderbilt University School of Medicine, Nashville, Tennessee, USA; 2CHU Clermont-Ferrand, Service de Nutrition, CRNH Auvergne, Clermont-Ferrand, France; 3Division of Nephrology, Department of Medicine, Emory University, Atlanta, Georgia, USA; 4Department of Nephrology, Hospital E.HERRIOT, Lyon, France; 5Division of Nephrology, Department of Medicine, University of Washington, Seattle, Washington, USA; 6Division of Nephrology, Department of Medicine, University of California Irvine, Orange, California, USA; 7Division of Nephrology, Department of Medicine, Vivantes Klinikum im Friedrichshain, Berlin Germany; 8Department of Renal Medicine, Karolinska Institute, Huddinge University Hospital, Stockholm, Sweden; 9Department of Nephrology, Vrije University Medical Center, Amsterdam, The Netherlands; 10Department of Medicine, Service of Nephrology, University Hospital (CHUV), Lausanne, Switzerland; 11Department of Medicine, Queen Mary Hospital, University of Hong Kong, Hong Kong, People’s Republic of China and 12Department of Medicine, Division of Nephrology, University of Wuerzburg, Wuerzburg, Germany Protein energy wasting (PEW) is common in patients with improvement in biomarkers of nutritional status is associated chronic kidney disease (CKD) and is associated with with improved survival, there are no large randomized adverse clinical outcomes, especially in individuals receiving clinical trials that have tested the effectiveness of nutritional maintenance dialysis therapy. A multitude of factors can interventions on mortality and morbidity. affect the nutritional and metabolic status of CKD patients Kidney International (2013) 84, 1096–1107; doi:10.1038/ki.2013.147; requiring a combination of therapeutic maneuvers to prevent published online 22 May 2013 or reverse protein and energy depletion. These include KEYWORDS: dialysis; malnutrition; metabolism; nutrition; supplementation optimizing dietary nutrient intake, appropriate treatment of metabolic disturbances such as metabolic acidosis, systemic Among the many risk factors that affect outcomes of chronic inflammation, and hormonal deficiencies, and prescribing kidney disease (CKD) patients, especially ones with end-stage optimized dialytic regimens. In patients where oral dietary renal disease (ESRD) and on maintenance dialysis, a state intake from regular meals cannot maintain adequate of metabolic and nutritional derangements, more aptly nutritional status, nutritional supplementation, administered called protein-energy wasting (PEW) of chronic kidney disease, orally, enterally, or parenterally, is shown to be effective in plays a major role.1–3 Multiple studies now indicate that PEW replenishing protein and energy stores. In clinical practice, is closely associated with major adverse clinical outcomes and the advantages of oral nutritional supplements include results in increased rates of hospitalization and death in these proven efficacy, safety, and compliance. Anabolic strategies patients.4,5 such as anabolic steroids, growth hormone, and exercise, in A significant number of factors affect nutritional and combination with nutritional supplementation or alone, have metabolic status in CKD, leading to multiple adverse been shown to improve protein stores and represent consequences (Figure 1).6 Accordingly, prevention and potential additional approaches for the treatment of PEW. treatment of PEW of CKD should involve an integrated Appetite stimulants, anti-inflammatory interventions, and approach to limit protein and energy depletion, in addition newer anabolic agents are emerging as novel therapies. to therapies that will avoid further losses and replenish While numerous epidemiological data suggest that an already wasted stores.7 This article aims to provide a broad approach for the management of PEW, with a specific Correspondence: T. Alp Ikizler, Vanderbilt University Medical Center, Division of Nephrology, 1161 21st Avenue South, S-3223 Medical Center emphasis on interventions targeted on etiological factors of North Nashville, Tennessee 37232-2372, USA. PEW in CKD patients. The overarching aim is to describe E-mail: [email protected] methods to counteract the catabolic processes leading to Received 14 February 2013; revised 28 February 2013; accepted 7 March PEW in CKD and provide means to treat the problem in 2013; published online 22 May 2013 patients already with PEW. In doing so, the rationale and 1096 Kidney International (2013) 84, 1096–1107 TA Ikizler et al.: Prevention and treatment of PEW in CKD patients review efficacy of nutritional interventions in CKD will also be Several strategies can be employed to prevent inadequate discussed. This review is focused on stage 3–5 CKD and nutrient intake in CKD patients (Table 1). In clinically stable ESRD patients on maintenance dialysis, with literature patients with stage 3–5 CKD who are not on dialysis, dietary selection and interpretation mostly based on the opinion of protein and energy intakes of 0.6–0.8g/kg of ideal body the authors and is not a systematic review of the literature. weight per day and 30–35kcal/ kg of ideal body weight per day, respectively, are able to preserve their protein stores 19–21 PREVENTION OF PEW IN CKD throughout the progression of kidney disease. However, Dietary nutrient intake in CKD patients these levels should be adjusted when hypermetabolic A frequent and important cause of PEW in CKD patients, conditions such as acute illness and hospitalizations occur. especially those on maintenance dialysis, is inadequate In ESRD patients on maintenance dialysis, there are dietary protein and energy intake.8–12 A major contributing additional protein catabolic stimuli such as the unavoidable factor to inadequate dietary intake in these patients is loss of amino acids and albumin into the dialysate and anorexia. Anorexia may develop as a result of retention of the inflammatory stimulus associated with the dialysis uremic toxins,13 dialysis procedure, intercurrent illness, procedure. Accordingly, the minimum protein and energy inflammation,4,14 acidemia, and/or cardiovascular disease. requirements for patients on maintenance hemo- and Inadequate nutrient intake may also occur secondary to comor- peritoneal dialysis are 1.2 g/kg of ideal body weight per day bid illness that affects gastrointestinal function, depression, and 30–35kcal/kg of ideal body weight per day based poor socioeconomic situation, or early satiety feeling with on physical activity level, respectively. Furthermore, it is peritoneal fluid infusion, and peritoneal glucose absorption important that at least 50% of the protein intake should be of in peritoneal dialysis (PD).15,16 Furthermore, additional nutrient high biological value. In elderly CKD patients who tend to loss during dialysis such as amino acids, some peptides, blood, lead a sedentary lifestyle, an energy intake of 30 kcal/kg body vitamins, trace elements, and glucose may further predispose weight per day is acceptable. In addition to conventional these patients to an increased risk of PEW.17,18 strategies to improve dietary nutrient intake, monitored, Causes of PEW Consequences of PEW Dietary nutrient intake Loss of kidney function Infection Uremic toxins (–) (+) (–) Comorbid conditions (–) (IR, diabetes, CVD Protein (+) depression) energy (–) (–) wasting Dialysis-associated (–) catabolism (–) (+) (–) Metabolic derangements Cardiovascular (HPT, metabolic acidosis, disease hypogonadism, GH resistance) Inflammation Frailty, depression Figure 1 | The conceptual model for etiology and consequences of protein energy wasting (PEW) in chronic kidney disease. CVD, cardiovascular disease; GH, growth hormone; HPT, hyperparathyroidism; IR, insulin resistance. Table 1 | Recommended minimum protein, energy, and mineral intakes for chronic kidney disease (CKD) and maintenance dialysis patients Nondialysis CKD Hemodialysis Peritoneal dialysis Protein 0.6–0.8 g/kg/day 41.2 g/kg/day 41.2 g/kg/day Illness 1.0 g/kg Peritonitis 41.5 g/kg Energy 30–35a kcal/kg/day 30–35a kcal/kg/day 30–35a kcal/kg/day including kcal from dialysate Sodium 80–100 mmol/day 80–100 mmol/day 80–100 mmol/day Potassium o1 mmol/kg if elevated o1 mmol/kg if elevated Not usually an issue Phosphorus 800–1000 mg and binders if elevated 800–1000 mg and binders if elevated 800–1000 mg and binders if elevated Greater than 50% of high biological value protein (that is, complete protein sources, containing the full spectrum of essential amino acids) is recommended. aBased on physical activity level. In sedentary elderly adults, recommended energy intake is 30 kcal/kg/day. All recommendations are based on ideal body weight. Regular follow-up supports compliance. Kidney International (2013) 84, 1096–1107 1097 review TA Ikizler et al.: Prevention and treatment of PEW in CKD patients in-center provision of high-protein meals or supplements beyond these targets has not been shown to improve the during hemodialysis is a feasible strategy and should be nutritional status any further. advocated
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