Management of Malnutrition in Older Adults with Polymorbidity

Screening and Assessment

• The American Geriatrics Society recommends screening all older adults with multiple chronic conditions for malnutrition risk at hospital admission using validated tools, such as NRS-2002 or MNA-SF, followed by immediate nutritional intervention for those at risk, as this approach reduces mortality, complications, and hospital readmissions 1, 2
• The European Society for Clinical Nutrition and Metabolism suggests using rapid, validated screening tools immediately upon hospital contact, such as NRS-2002 for hospitalized polymorbid patients or MNA-SF for older adults, as both tools demonstrate high content validity and reliability even in patients with cognitive dysfunction 2, 3
• Polymorbid medical inpatients have a 40-50% prevalence of malnutrition in tertiary care centers, making universal screening essential 1, 2
• The Global Leadership Initiative on Malnutrition recommends establishing a diagnosis using GLIM criteria, which requires both phenotypic criteria and etiologic criteria 2

Nutritional Targets and Interventions

• The American College of Nutrition recommends targeting 27 kcal/kg actual body weight/day for polymorbid older patients (≥65 years) 3
• The European Society for Clinical Nutrition and Metabolism suggests providing 1.1-1.5 g protein/kg body weight/day, as this is cost-effective and highly efficient to prevent weight loss, reduce complications, improve functional outcomes, and quality of life 3, 4
• The American Geriatrics Society recommends ensuring adequate intake of vitamins and trace elements to meet daily estimated requirements 2, 3

Treatment Algorithm

• The European Society for Clinical Nutrition and Metabolism recommends beginning with dietary counseling and food fortification to increase energy and protein density without increasing volume 5
• The American College of Nutrition suggests prescribing high-protein oral nutritional supplements providing at least 400 kcal/day, including ≥30g protein/day, when dietary counseling fails 5
• The American Geriatrics Society recommends using enteral nutrition before parenteral nutrition due to lower risk of infectious complications, non-infectious complications, and maintenance of gut integrity 3, 4

Disease-Specific Considerations

• The American Diabetes Association recommends following the same guidelines as non-diabetic older adults for diabetes with malnutrition, as prevention and treatment of malnutrition takes priority over possible long-term hyperglycemia complications 6, 5
• The European Society for Clinical Nutrition and Metabolism suggests considering supplementation with formulas enriched in arginine, zinc, and antioxidants for pressure ulcers, as one controlled trial showed improved healing compared to isocaloric isonitrogenous formula 6, 5

Post-Discharge Management

• The American Geriatrics Society recommends continuing oral nutritional supplements or individualized nutritional intervention post-discharge to maintain or improve body weight, nutritional status, and lower mortality 4
• The European Society for Clinical Nutrition and Metabolism suggests establishing organizational changes, including nutritional multidisciplinary support teams and nutrition protocols, to improve intake and outcomes 4

Monitoring

• The American College of Nutrition recommends tracking functional indices, such as mobility, activities of daily living, and quality of life, rather than solely nutritional parameters, as these are more appropriate for assessing clinical outcomes, including survival, in polymorbid patients 3, 4
• The American Geriatrics Society suggests monitoring for drug-drug and drug-nutrient interactions with pharmacist-assisted management plan 3, 4

Critical Pitfalls to Avoid

• The European Society for Clinical Nutrition and Metabolism recommends never delaying screening or intervention, as malnourished patients have 2.38 times higher odds of length of stay ≥3 days and 2.28 times higher odds of 30-day readmission 1, 2
• The American Geriatrics Society suggests avoiding restrictive diets that limit intake, as they can lead to nutrient deficiencies 6, 5

Guidelines for Managing Electrolyte, Hydration, and Nutritional Issues in Elderly Patients with Sacral Pressure Ulcers

Electrolyte Disturbances

• Hypernatremia with serum osmolality > 300 mOsm/kg is the predominant electrolyte abnormality in immobile elderly patients with dehydration and sacral pressure ulcers, and it independently raises mortality risk and accelerates functional decline. 7, 8

Diagnostic Approach to Dehydration

• Serum or plasma osmolality measurement is the gold‑standard test for low‑intake dehydration; an osmolality > 300 mOsm/kg should trigger intervention. 7, 8
• When direct osmolality is unavailable, calculate osmolarity with 1.86 × (Na⁺ + K⁺) + 1.15 × glucose + urea + 14 (mmol/L); values > 295 mmol/L warrant treatment. 7, 8
• Physical signs such as skin turgor, oral dryness, weight change, or urine colour/specific gravity are unreliable for detecting dehydration in older adults. 7, 8
• Bioelectrical impedance does not provide diagnostic value for hydration status in this population and should not be used. 7, 8

Immediate Hydration Assessment and Correction

• All elderly patients with pressure ulcers should be screened for dehydration at admission and whenever clinical status changes unexpectedly. 7, 8
• An osmolality > 300 mOsm/kg doubles the 4‑year risk of disability and is associated with increased mortality; urgent fluid replacement is indicated. 8
• When the urea‑to‑creatinine ratio exceeds 40, prescribe scheduled oral fluid intake (e.g., four glasses of water daily administered like medication). 9

Disease‑Specific Nutritional and Fluid Considerations

Diabetes

• Diabetic patients with pressure ulcers follow the same malnutrition screening and treatment protocols as non‑diabetic patients. 10, 11, 8
• Prioritising malnutrition prevention and treatment outweighs concerns about long‑term hyperglycaemia complications in this group. 8
• Restrictive diets should be avoided because they precipitate micronutrient deficiencies and functional decline. 10, 8
• Recommended diet: ≈ 30 kcal/kg/day, 50‑55 % of calories from carbohydrates, 25‑30 g/day fibre, emphasizing mono‑ and poly‑unsaturated fatty acids. 8

Heart Failure

• Fluid repletion must be balanced against the risk of volume overload; close monitoring is essential. 8

Ongoing Monitoring and Re‑assessment

• Re‑evaluate hydration status periodically in patients identified as malnourished or at risk of malnutrition, using serum osmolality or calculated osmolarity. 7, 8

Multidisciplinary Delirium Prevention

• All elderly patients at moderate‑to‑high risk of delirium—including those with dehydration and pressure ulcers—should receive a multi‑component non‑pharmacological programme that incorporates optimal hydration and nutrition. 10, 11
• Dehydration acts as a common precipitating factor and malnutrition as a contributing factor for delirium in this cohort. 11
• Implementation of such bundled interventions has been shown to significantly lower delirium incidence on medical wards. 10, 11