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USE OF SUPPLEMENTAL NUTRITITION IN THE AGING POPULATION Objectives 1. Describe the presence of malnutrition in the elderly today 2. Identify the factors that contribute to malnutrition in the elderly 3. Identify when oral nutrition supplements are indicated and should be prescribed 4. Identify common oral nutrition supplements available 5. Identify methods for improving patient acceptance of oral supplements 6. Identify disadvantages associated with the use of oral supplements 6. Identify when enteral nutrition support is indicated and should be prescribed 7. Identify common enteral nutrition supplements available 8. Identify disadvantages/risks associated with the use of enteral nutrition supplements Prevalence of Malnutrition in the Elderly (1) Aging is accompanied by physiologic changes that can negatively impact nutritional status. Chronic disease can negatively impact nutritional status. In the United States, the prevalence of malnutrition in the elderly is less than 1% in individuals who are independent and healthy. The prevalence of malnutrition in the elderly is 23% to 85% in nursing home residents. The prevalence of malnutrition in the elderly is 33% to 55% in those hospitalized. An estimated 85% of Americans age 65 and older have one or more chronic disease that may benefit from nutritional intervention for reduction of morbidity and mortality. Types of Malnutrition Malnutrition: Any disorder of nutritional status, including disorders resulting from a deficiency of nutrient intake, impaired nutrient metabolism, or over-nutrition. Protein-energy under-nutrition: The presence of clinical (i.e., physical signs such as wasting, low body mass index [BMI]) and biochemical (i.e., albumin or other serum protein) evidence of insufficient intake. Causes of Malnutrition (2) Dietary intake Energy needs decrease with age; yet the need for most nutrients remains relatively unchanged resulting in an increased risk of malnutrition. ◦ ◦ ◦ ◦ Little or no appetite Problems with eating or swallowing Eating inadequate servings of nutrients Eating fewer than two meals a day Limited income ◦ Restriction in the number of meals eaten per day ◦ Reduced dietary quality of meals Isolation ◦ ◦ ◦ ◦ Older adults who live alone may lose desire to cook because of loneliness Appetite of widows decreases Difficulty cooking due to disabilities Lack of access to transportation to buy food Chronic illness and acute conditions Acute and Chronic conditions can affect intake and/or increase nutritional demands. ◦ Drug–nutrient interactions ◦ Disability ◦ Depression ◦ Poor oral health ◦ Dysphagia Physiological changes Decrease in lean body mass and redistribution of fat around internal organs lead to decreased caloric requirements. Change in taste from medications, nutrient deficiencies, or tastebud atrophy can also alter nutritional status. Bioavailability of micronutrients Progressive Undernutrition (2) The cumulative effect of the interaction between nutrition and changes seen in aging is progressive undernutrition which often goes undiagnosed. Early detection of malnutrition is important since it has been associated with diminished cognitive function and a diminished ability to care for one's self. Identifying Malnutrition in the Elderly BMI alone does not identify undernutrition in obese people and may falsely identify thin people as malnourished. Plasma albumin, as a nutritional parameter, is difficult to use in people with inflammation or dehydration; two very frequent conditions in the frail elderly. Nutrition Screening (3) U.S. hospitals required by Joint Commission to provide nutrition screening to all patients within 24 hours of admission. ◦ This does not cover patients in other settings. There is not a standardized assessment tool for finding malnutrition in older adults. ◦ There are assessment tools available specifically for the geriatric patient. Elderly specific screening tools should address the following: ◦ Does patient Suffer from chronic disease? Take multiple medications? Had decline in food intake over the past 3 months due to loss of appetite, digestive problems, chewing or swallowing difficulties? Experienced weight loss during the last 3 months? Decline/change in mobility ? Experienced psychological stress or acute disease in the past 3 months? Have Neuropsychological problems? Financial concerns? Body Mass Index (BMI) less than 19 ? Over 25? Nursing strategies (2) Collaboration Alleviate dry mouth Improve oral intake Provide conducive environment for meals Specialized Nutrition Support when indicated Start Specialized Nutritional Support When a patient cannot, should not, or will not eat adequately. If the benefits of nutrition outweigh the associated risks. If the patient's advanced directives regarding the use of artificial nutrition and hydration allows. (6) Nutrition Support Beyond that provided by normal food intake Includes ◦ Modified food and menus ◦ Food fortification ◦ Oral nutrition supplements (ONS) ◦ Vitamin/Mineral supplementation ◦ Enteral nutrition/tube feeding (EN) ◦ Parenteral nutrition Liberalized Diets There is a growing recognition that nutrient intake of hospitalized patients and long-term care residents is negatively impacted by overly restrictive diets. In order to improve patient satisfaction and allow for optimal nutrient intake, the most liberalized diet order possible is encouraged. Food Fortification Dietary Manipulation ◦ Food fortification using protein and energy rich food ingredients or commercially available protein or energy powders and liquids added to the diet. Additional Foods ◦ Snacks, cakes, puddings, icecream Dietary Fortification Adding Calories ◦ Oil ◦ Cream ◦ Sour cream ◦ Butter ◦ Milk ◦ Cheese ◦ Sugar ◦ Skimmed milk powder ◦ Commercial Carbohydrate/protein powder or liquids Flavor enhancers ◦ Monosodium glutamate ◦ Salt Strengths Availability Familiarity Palatability Extra calories Cheap Weaknesses Increase in food volume or quantity may be unsuitable for anorexia. May be difficult for those with chewing or swallowing difficulties. Other nutrients. Ease of use/preparation high blood pressure or some allergies. Common Oral Supplements • • • • • Suitable for patients with poor po intake or increased calorie needs Standard 1-1.2 kcal/ml with or without fiber 8-16 grams protein Flavored With or without specific micronutrients Can be added to regular foods Many can also be used as tube feeding formula Many available at local pharmacies and grocery stores General Use Lactose Free Gluten Free Most sodium friendly Ensure, Ensure Plus Healthshake Resource Plus Isosource, Fibresource Boost Jevity Respiratory Product ◦ Pulmocare Diabetic Products ◦ Glucerna ◦ Glucerna 1.2 cal ◦ Resource Diabetic ◦ Boost Glucose Control Renal Products ◦ Nepro; dialysis ◦ NovaSource Renal ◦ Suplena; pre-dialysis Protein Only Unjury-protein only Beneprotein COMMON CLEAR LIQUID SUPPLEMENTS •Use for clear liquid diets, pre- and post-surgical, bowel prep, fat-malabsorptive, and fat-restricted diets. •Use for providing extra calories and/or protein as an alternative to creamy shake-like supplements. Available in 1-6 oz servings 100-200 calories 8-24 grams protein Flavored or Unflavored With or without specific micronutrients •Can be added to regular foods • Some can be added to tube feedings to boost protein needs •Fat Free • Lactose Free • Gluten Free •Most sodium friendly Increasing Protein ◦ ◦ ◦ ◦ • • • • • Healthy Shot, Double Shot Enlive Juven Promod Increasing Calories ◦ Polycose Powder -100 cal/oz ◦ BeneCalorie SUPPLEMENTAL FOODS •May be disease specific •Can be used to help increase calories/protein •Can be used to provide variety to restricted diets •Can be used to enhance nutrient intake with limited added calories Ensure Boost ◦ Pudding Diabetic Products ◦ Glucerna Snack Bar Shake Pudding Cereal Specialized nutritional support – Oral Nutrition Supplements (ONS) (5) ◦ ◦ ◦ ◦ ◦ At nutritional risk or who are undernourished Following orthopedic-surgical procedures In demented patients At risk for or with Pressure Ulcers Frail Elderly Problems associated with the use of ONS (7) Reduction in the intake of normal food Low palatability Adverse effects Wastage Palatability of Oral Nutritional Supplements Poor patient acceptance is a common barrier to intake of oral nutrition supplements. Taste is a key limiting factor for older people. Methods of ONS Delivery Shown to Improve Intake Timing around meals and bedtime MedPass Targeted Feeding Assistance Dietitian Involvement Group Meals and Snack Service; Nursing Homes, Rehab Problems associated with the use of ONS cont Oral nutritional therapy via assisted feeding and dietary supplements is often difficult, time-consuming and demanding in elderly patients due to multimorbidity and slow responses. ◦ However assisted oral feeding and supplements are able to support the physical and psychological rehabilitation of most elderly patients. Considerations for ongoing use of a supplement may include: Is the patient using the supplement? Is there any wastage? Is the original clinical indication still valid? Is the patient gaining weight? Has a dietician been consulted to assist with the nutritional planning for this patient? Could the patient be encouraged to adopt a diet that meets their energy needs, through the use of supermarket products or prepared meals? Is there a plan in place to gradually replace use of the supplement with a regular diet? Dysphagia (8) Managing Dysphagia Factors to consider before initiating modified oral nutrition support and hydration and/or enteral nutrition ◦ ◦ ◦ ◦ ◦ ◦ ◦ ◦ ◦ ◦ ◦ Recurrent chest infections Mobility Dependency on others for assistance to eat Perceived palatability and appearance of food or drink Level of alertness Compromised physiology Poor oral hygiene Compromised medical status Metabolic and nutritional requirements Vulnerability or immunocompromised Comorbidities National Dysphagia Diet (NDD) In 2002, the American Dietetic Association established the National Dysphagia Diet guidelines for thickened dietary supplements. ◦ This Task Force proposed viscosity ranges for thin, nectar, and honey-thick liquids. The National Dysphaia Diet, cont (9) Prescribes four levels of food modification ◦ Level 1 Patients with significant impairment in control ◦ Levels 2 and 3 Patients with some ability to chew ◦ Level 4 Patients able to eat an unrestricted regular diet National Dysphagia Level 1: Pureed (9) For people who have moderate to severe dysphagia, with poor oral phase abilities and reduced ability to protect their airway. ◦ Close or complete supervision and alternate feeding methods may be required. Pureed, homogenous, and cohesive foods ◦ Food should be “pudding-like”. ◦ No coarse textures, raw fruits or vegetables, nuts, and so forth are allowed. ◦ Any food that require bolus formation, controlled manipulation, or mastication are excluded. Includes all unthickened beverages and supplements ◦ Liquid Consistency Thin Nectar-like Honey-like Spoon-thick/ pudding Ready-to-serve vs point of care thickeners Modified fluids and foods are available for purchase in a ready-to-serve form. Commercially available thickening agents that specify viscosity ranges include ◦ RESOURCE® ThickenUp® ◦ Hormel Thick & Easy® Instant Thickeners ◦ Thik & Clear® Consistency of Food and Beverage Usage Chart for bottle for RESOURCE® ThickenUp® : One stroke will deliver approximately 15g of thickening gel. Desired Consistency Per 4oz Nectar 1 stroke 2 strokes Honey 2 strokes Per 8 oz. 4 strokes Pudding 4 strokes 8 strokes Dysphagia Diet Foods (10) Are thickened as recommended by the National Dysphagia Diet (NDD) guidelines. ◦ Can be cost effective for the institution. ◦ The viscosities of commercial dysphagia diet foods have been shown to be inconsistent with NDD guidelines. Pureed Meals Provides about 550-600 calories per meal and 19-23 gm protein per meal. Typical Pureed Meal Service Hospital Setting: ◦ Breakfast: Pureed eggs, strained oatmeal, thickened milk and thickened juice. ◦ Noon/Eve: Pureed Beef, Pureed Carrots, Mashed Potatoes Brown Gravy 2 oz. thickened milk and thickened juice. Problems with Dysphagia Diet (11) ◦ Statistically significant results indicate that older people on texture-modified diets have a lower intake of energy and protein than those consuming a normal hospital diet and it is likely that other nutrients will be inadequate. ◦ The viscosity of barium test feeds is much greater than the correspondingly named diet foods and the NDD guidelines. ◦ Variety in pureed menus may be lacking. ◦ Poor patient acceptance. ◦ Lack of or delayed advancement in level. Recommendations ◦ All patients on texture-modified diets should be assessed by the dietitian for nutritional support. ◦ Evidence based strategies for improving overall nutrient intake should be identified. Strategies Educate and inform patients and family members. Be well informed/trained about modification practices in your facility. ◦ “thicker is not always better” Monitor status and advocate for reevaluation for diet advancement. Severe Neurological Dysphagia (5) Enteral Nutrition (EN) is clearly indicated. For long-term nutritional support PEG should be preferred to NGT. EN should be initiated as soon as possible and accompany intensive swallowing therapy until safe and sufficient oral intake from a normal diet is possible. Enteral Nutrition Indications for enteral nutrition (6) • • • • • • • • Unconscious patient Neuromuscular swallowing disorder Physiological anorexia *Upper GI obstruction ,GI dysfunction or malabsorption Increased nutritional requirements Psychological problems Specific treatment Mental health Considerations when prescribing enteral formula type (13) Formulary of Institution ◦ A potential safety issue may arise if limited to products based on an institutional contract in that they might not be appropriate for the patient population or setting. ◦ Should be specific to the institution. Should be established based on patient population and estimated nutrient needs rather than specific diagnosis. Considerations when prescribing enteral formula type, cont Considerations should include ◦ Nutrition and physical assessment, metabolic abnormalities, GI function, overall medical condition, and expected outcomes. ◦ Comparison of the patient’s condition and nutrient needs with the specific properties of the available nutritional formulas. Standard Formulas (14) Most contain enough electrolytes and minerals to meet the minimum daily requirement of Sodium, Potassium, Calcium, Magnesium and Phosphorus if the patient is receiving enough to meet energy needs. Some are designed specifically for patients with low energy needs but still requiring adequate electrolytes vitamins and minerals. ICU patients not meeting criteria for immune-modulating formulas should receive standard formulas. Considerations with Renal Impairment ICU patients: acute renal failure/acute kidney injury (ARF) (AKI) ◦ Use standard formulas If significant electrolyte abnormalities exist or develop: a specialty formulation designed for renal failure (with appropriate electrolyte profile) may be considered. Patients receiving dialysis ◦ Should receive increased protein, up to a maximum of 2.5 g/kg/d. Patients with renal insufficiency ◦ Protein should not be restricted in means to avoid or delay initiation of dialysis therapy. Considerations with Hepatic Impairment Cirrhosis and hepatic failure ◦ EN is the preferred route of nutrition therapy in ICU patients with acute and/or chronic liver disease versus PN. Avoid restricting protein. ICU patients with acute and chronic liver disease ◦ Use standard enteral formulations. ◦ In encephalopathic patients who are refractory to standard treatment with luminal acting antibiotics and lactulose: Use branched chain amino acid formulations Pancreatitis Mild to moderate acute pancreatitis ◦ Does not require nutrition support therapy unless: An unexpected complication develops. There is failure to advance to oral diet within 7 days. Severe acute pancreatitis ◦ Feed enteral by gastric or jejunal route. Immune-modulating Formulas Supplemented with immune enhancing agents ◦ Arginine, glutamine, nucleic acid, ω-3 fatty acids,and antioxidants. Should be used for the appropriate patient population. ◦ Major elective surgery, trauma, burns, head and neck cancer, and critically ill patients on mechanical ventilation ◦ Caution in severe sepsis. ◦ Surgical ICU patients ◦ Medical ICU patients Immune-Modulating Formulas, cont Evidence of Benefits ◦ More uniformly seen in patients undergoing major surgery than in critically ill patients on mechanical ventilation. ◦ More pronounced when given in the preoperative period. ◦ Are dose-dependent. No Benefit ◦ Hypothesized that there may be some increased risk with the use of arginine-containing formulations in medical ICU patients who are severely septic. ◦ Patients not meeting the criteria Decreased likelihood that immune-modulating formulas change outcome. The added cost of these specialty formulas cannot be justified and standard enteral formulas should be used.. Anti-inflammatory Supplemented with anti-inflammatory lipid profile ◦ ω-3 fish oils, borage oil and antioxidants. Benefits ◦ Patients with Acute Respiratory Distress Syndrome (ARDS) and severe acute lung injury (ALI) should be placed on an enteral formulation with the antiinflammatory lipid profile. Fiber and Elemental Formulas Evidence of diarrhea ◦ Soluble fiber-containing or small peptide formulas Critically ill patients ◦ Insoluble fiber should be avoided Patients at high risk for bowel ischemia or severe dysmotility ◦ Both soluble and insoluble fiber should be avoided Motility Agents and Probiotics Impaired gastrointestinal motility may cause abdominal distension, vomiting, GERD, pulmonary aspiration , pneumonia, sepsis. ◦ Administration of prokinetic agents can improve gastric emptying and intestinal motility. Probiotic agents have been shown to improve outcome in specific critically ill patient populations . ◦ Most consistently by decreasing infection. ◦ Transplantation, major abdominal surgery, and severe trauma. The Goals of Enteral Nutrition Therapy in the Elderly (5) The Provision of sufficient amounts of energy, protein and micronutrients. Maintenance or improvement of nutritional status. Maintenance or improvement of function, activity and capacity for rehabilitation. Maintenance or improvement of quality of life. Reduction in morbidity and mortality. Considering the reduced adaptive and regenerative capacity of the elderly, EN may be indicated earlier and for longer periods than in younger patients. Frail elderly may benefit from EN as long as their general condition is stable. Indications for EN in the Elderly Undernutrition and risk of undernutrition. Depression Early and moderate dementia consider ONS and occasionally EN Pressure ulcers. Label Content and Health Claims Attributed to Oral and Enteral Formulas (14) Patients and healthcare professionals must give special attention to the veracity of enteral formula manufacturers on the labeled content and health claims attributed to formulas. ◦ Enteral Formulas are classified by the U.S. Food and Drug Administration (FDA) under the heading of medical foods. ◦ Medical foods have been defined, but they are not regulated as either conventional food or as drugs. Enteral Formula Type and Use (6) Common Enteral Supplements Jevity Can and Jevity Ready to Hang with Fiber Jevity 1.2 Can Jevity 1.2 Ready to Hang Nepro, Nutrihep Ready to Hang Optisource Hi Pro Osmolite can and Osmolite Ready to Hang Perative can and Perative Ready to Hang Promote can and Promote Ready to Hang Pulmocare can and Pulmocare Ready to Hang Suplena Two Cal HN Vital HN Vivonex Oxepa Jevity 1 Cal with Fiber and Jevity 1.5 with Fiber Complications and Adverse Effects of Enteral Feeding (6) Insertion Post insertion trauma Displacement Reflux GI intolerance Metabolic Refeeding Syndrome Criteria for determining elderly people at high risk of developing refeeding problems: Patient has one or more of the following ◦ BMI less than 16 kg/m2 ◦ Unintentional weight loss greater than 15% within the last 3-6 months ◦ Little or now nutritional intake for more than 10 days ◦ Low levels of K P04, mg prior to feeding Or patient has two or more of the following ◦ BMI less than 18.5 kg/m2 ◦ Unintentional weight loss greater than 10% within the last 3-6 months ◦ Little or no nutritional intake for more than 5 days ◦ A history of alcohol abuse or drugs including insulin chemotherapy antacids or diuretics. To promote tolerance Tube placement ◦ NG or PEG/ PEJ Formula Selection ◦ RD consult Initiate at rates of 50 cc/hr in adults and advance by 20-30 cc/hr. Use Isotonic (300 mOsm/L) formulas. Use continuous infusion to establish tolerance initially and later transition to an intermittent infusion schedule. Monitoring ◦ Checking gastric residuals every 4-6 hr until desired rate is established. I ◦ Hold for 1 hour if gastric residual is >(1.0 to 1.5) x hourly rate or >150 mL before bolus or intermittent feeding. ◦ Daily weights, I/O records, serum electrolytes, phosphorus, magnesium, and ionized calcium should be monitored until tolerance is established and patient is stable. Decision Making Concerning EN in the Elderly (5) Does the patient suffer from a condition that is likely to benefit from EN? Will nutritional support improve outcome and/or accelerate recovery? Does the patient suffer from an incurable disease, but one in which quality of life and wellbeing can be maintained or improved by EN? Does the anticipated benefit outweigh the potential risks? Does EN accord with the expressed or presumed will of the patient, or in the case of incompetent patients, of his/her legal representative? Are there sufficient resources available to manage EN properly? If long-term EN implies a different living situation (institution vs. home), will the change benefit the patient overall? Long-term Nutrition Support (6) Living with the reality of what it meant not to eat was reported by the National Collaborating Centre for Acute Care . ◦ Patients expressed the importance of sharing their experiences with someone who is also receiving long term nutrition support. ◦ A predominant feature in the literature was the need for counseling. Patients Reported: Difficulty in coping with the temptation not to eat. Feelings of guilt and low self esteem. Guilt and personal responsibility in relation to their illness. Reluctance to join social events. Concerns that others found it uncomfortable to eat in the presence of them. Disturbed sleeping patterns . The most difficult aspect emotionally was related to reactions of friends, family and the community. Recommendations for Patients Receiving Long Term Nutrition Support: Patients should be kept fully informed and have access to appropriate sources of information in formats, languages and ways that are suited to the individual. Patients should have the opportunity to discuss diagnosis, treatment options and relevant physical psychological and social issues. Cognition, gender, physical needs, culture and stage of life to the individual should be considered. Contact details for relevant support groups, charities and voluntary organizations should be provided. Nutrition Therapy in End-of-Life Situations (12) Specialized nutrition therapy is not obligatory in cases of futile care or end-of-life situations. The decision to provide nutrition therapy should be based on effective patient/family communication, realistic goals, and respect for patient autonomy. Foregoing aggressive nutrition therapy(15) The following decreases in symptoms, although not all-encompassing, may benefit the patient. ◦ Gastrointestinal and venous distention ◦ Nausea ◦ Vomiting ◦ Potential for aspiration ◦ Diarrhea ◦ Urinary problems ◦ Pulmonary secretions Conclusions As the population ages, the problem of poor nutrition among the elderly grows. Improved care for the vulnerable older population calls for increased awareness of the importance of nutrition, updated and enhanced treatment standards, and implementation of care strategies that prevent or delay consequences of poor nutrition. Conclusions The use of Nutritional Supplements oral or enteral in the Aging Population Nutrition Supplementation oral or enteral Benefits When administered appropriately ◦ Can increase calorie, protein intake for those at risk for malnutrition or with malnutrition or with increased needs. ◦ Can be cost-effective. ◦ Can have significant impact on recovery from illness or quality of life. Nutrition Supplementation oral or enteral Disadvantages When administered inappropriately ◦ Can be ineffective. ◦ Can be costly. ◦ Can be detrimental to patients safety and/or recovery. ◦ May not be suitable for all elderly patients. References 1. Nurse Practitioner, Mar 2001 by Ennis, Beth Waters, Saffel-Shrier, Susan, Verson, Hilary 2.NUTRITION IN THE ELDERLY Nursing Standard of Practice Protocol: Nutrition in Aging Rose Ann DiMaria-Ghalili, PhD, RN, CNSN Evidence-Based Content - Updated January 2008 3. AJN, American Journal of Nursing February 2008 Volume 108 Number 2 Pages 50 - 59 4. Aging Clin Exp Res. 2008 Aug;20(4):322-8. 5. ESPEN Guidelines on Enteral Nutrition: Geriatrics 19 January 2006 6 National Collaborating Centre for Acute Care, February 2006. Nutrition support in adults Oral nutrition support, enteral tube feeding and parenteral nutrition.National Collaborating Centre for Acute Care, London. Available from www.rcseng.ac.uk Commissioned by the National Institute for Health and Clinical Excellence 7. Guigoz Y, Vellas B, Garry PJ. Assessing the nutritional status of the elderly: The Mini Nutritional Assessment as part of the geriatric evaluation. Nutr Rev 1996;54(1):S59-S65. 8. Published online before print March 13, 2008, doi: 10.1378/chest.08-0255 CHEST June 2008 vol. 133 no. 6 1397-1401 Lindsay Strowd, BS, Julie Kyzima, MA, CCC/SLP, David Pillsbury, MA, CCC/A, Tom Valley, BS, and Bruce R. Rubin, MEngr, MD, MBA, FCCP 9. AJN, American Journal of Nursing: November 2010 - Volume 110 - Issue 11 - pp 26-33 doi: 10.1097/01.NAJ.0000390519.83887.02 Feature Articles Managing Dysphagia Through Diet Modifications Garcia, Jane Mertz PhD, CCC-SLP; Chambers, Edgar IV PhD 10. CHEST June 2008 vol. 133 no. 6 1397-1401 Lindsay Strowd, BS, Julie Kyzima, MA, CCC/SLP, David Pillsbury, MA, CCC/A, Tom Valley, BS, and Bruce R. Rubin, MEngr, MD, MBA, FCCP Published online before print March 13, 2008, doi: 10.1378/chest.08-0255 11. Journal of Human Nutrition and Dietetics Volume 18, Issue 3, pages 213–219, June 2005 12. 12. JPEN J Parenter Enteral Nutr MAY-JUNE 2009 vol. 33 no. 3 277-316 Guidelines for the Provision and Assessment of Nutrition Support Therapy in the Adult Critically Ill Patient: 13. ASPEN Clinical Guidelines 2009 Adult Critical Care - In collaboration with the Society of Critical Care Medicine (SCCM) 14. JPEN J Parenter Enteral Nutr MAY-JUNE 2009 vol. 33 no. 3 277-316 15. 15. (ADA, 2004, Hallenbeck, 2003) 16. 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