Malnutrition and Nutritional assessment Flashcards
Define Malnutrition
a state resulting from lack of uptake or intake of nutrition leading to altered body composition and body cell mass leading to diminished physical and mental function and impaired clinical outcome from disease”.
Who is at risk of Malnutrition?
Older people, especially when admitted to hospital
Diabetes, CKD, Dementia, Cancer, Patients with any kind of GI dysfunction.
Every 1 in 3 people admitted to hospital has malnutrition. 70% of people have lost weight at discharge, mainly muscle mass.
What is the impact of Malnutrition in the UK
Direct cause 66 hospital deaths
Contributory factor 285 hospital deaths£ 19.6 billion 15% of the total public expenditure on health and social care.
What are the effects of Malnutrition?
Physical and functional decline and poorer clinical outcomes
↑ Mortality, septic and post surgical complications, length of hospital-stay, pressure sores, re-admissions, dependency
↓ Wound healing, response to treatment, rehabilitation potential, quality of life
How is Malnutrition diagnosed?
MalnutritionUniversalScreeningTool MUST
Screen -
A simple tool to identify risk.
Carried out by any HCP.
This is not assessment or diagnosis
Assess- Dietician
A systematic process of collecting & interpreting information to determine the nature and cause of the nutrient imbalance.
Diagnose - Nutritional Diagnosis
What is a major assessment tool in diagnosing Malnutrition?
Anthropometry
Measurement of bodies physical properties, different body compartments affected differently by malnutrition.
e.g. mid-arm muscle diameter, Multi-frequency bioelectrical impedance analysis, CTs provide information on fat and muscle contact. Muscle strength can predict mortality and morbidity better than muscle mass. Measurement of nutrient availability in fluid and tissue. Nutrition history may reveal many dietary issues.
What are some limitations of using BMI?
Does not take into account gender, ethnicity, age. also cannot distinguish between fat mass and fat free mass.
Plays a small role in malnutrition diagnosis.
How do you measure Indirect Calorimetry?
Most reliable methods to measure energy expenditure, measurement of resting metabolic rate using a respirator gas exchange canopy. In clinical practice, equations are used instead. Equations have their limitations as well. Will be used as a starting point
Who should Nutritional support be considered in?
Malnourished
At risk of malnutrition
Who is defined as Malnourished?
BMI < 18.5 kg/m2 or
Unintentional weight loss >10 % past 3 - 6 / 12 or
BMI < 20 kg/m2 + unintentional weight loss > 5 % past 3 – 6 / 12.
Who is seen to be at risk of Malnutrition?
Have eaten little or nothing for > 5 days and / or are likely to eat little or nothing for the next 5 days or longer or
Have a poor absorptive capacity, and / or have high nutrient losses and/or have increased nutritional needs from causes such as catabolism.
What is Artificial Nutrition Support?
The provision of enteral or parenteral nutrients to treat or prevent malnutrition.
What would the treatment be for someone in whom the oral route is possible & safe?
Oral nutritional support
Dietetic counselling, dietary fortification, oral nutritional supplements, additional snacks
What would be the treatment be for someone with an accessible GI tract but in whom the oral route is not possible?
Enteral Feeding tube
Short term - 2-4 weeks - Fine bore naso-enteral tube
Long term - > 4 weeks - Long term tube placement
Continued monitoring required.
What would be the treatment for someone with an inaccessible GI tract and in whom the oral route is not possible?
Parenteral Nutrition (but enteral support is better generally)
What is the route for enteral support?
Enteral nutrition (EN) is superior to parenteral nutrition (PN).
Where parenteral nutrition is used, the aim is to return to enteral → oral feeding as soon as (where) clinically possible.
How would the possibility of gastric feeding influence the type of tube used
Yes = Naso-gastric tube (NGT) No = Naso-duodenal (NDT) / naso-jejunal tube (NJT)
Long term (> 3 months) = Gastrostomy/jejunstomy
What are the complications associated with enteral feeding?
Mechanical: misplacement, blockage, buried bumper
Metabolic: hypergylcaemia, deranged electrolytes
GI: Aspiration, nasopharyngeal pain, laryngeal ulceration, vomiting, diarrhoea.
What should the pH of NGT’s be?
Aspirate pH 5.5
If pH > 5.5 → chest x-ray, interpreted by trained professional following NPSA guidelines
What is Parenteral Nutrition?
Parenteral nutrition (PN): The delivery of nutrients, electrolytes and fluid directly into venous blood.
What are the indications of Parenteral feeding?
An inadequate or unsafe oral and/or enteral nutritional intake
OR
A non-functioning, inaccessible or perforated gastrointestinal tract
What is the access of Parenteral nutrition?
Central venous catheter (CVC): tip at superior vena cava and right atrium.
Different CVCs for short / long term use.
What is the Composition aspect of Parenteral nutrition?
Ready made / bespoke “scratch” bags.
MDT → fluid and electrolyte targets
What are the complications of Parenteral nutrition?
Metabolic - Deranged electrolytes, hyperglycaemia, abnormal liver enzymes, oedema, hypertriglyceridaemia
Mechanical - Pneumothorax, Haemothorax, thrombosis, cardiac arrhythmias, thrombus, catheter occlusion, thrombophlebitis, extravasion
Catheter related infections
What is the role of albumin in poor prognosis?
Albumin synthesised in the liver.
Low plasma albumin = poor prognosis.
A negative acute phase protein = ↓ plasma albumin when ↑ inflammation
What happens to albumin in the acute inflammatory phase?
Inflammatory stimulus → activation of monocytes & macrophages → release cytokines.
Cytokines act on liver to stimulate production of some proteins whilst downregulating production of others e.g. albumin
A moderate inflammatory stimulus will induce plasma acute phase protein changes.
The negative acute phase protein, albumin, will↓.
Is albumin a valid marker of malnutrition in the acute hospital setting?
No.
Albumin synthesis ↓es in response to inflammation ∴ it is not a valid marker of nutrition status nor an indication for nutrition intervention in the acute setting.
Best evidence = hypoalbuminaemia in obese trauma patients.
Dietitian focused on the aetiology/impact of the inflammatory state on nutrition status.
What is Refeeding Syndrome?
A group of biochemical shifts & clinical symptoms that can occur in the malnourished or starved individual on the reintroduction of oral, enteral or parenteral nutrition.
Ketones, used for energy due to Free fatty acids being released from stores, decrease in basal metabolic rate resulting in fat mass loss.
What are the consequences of Refeeding syndrome?
Arrhythmia, tachycardia, CHF → Cardiac arrest, sudden death
Respiratory depression
Encephalopathy, coma, seizures, rhabdomyolysis,
Wernicke’s encephalopy
What do low Carbohydrate concentrations lead to?
Secretion of insulin stimulating NaKAtpase pump requiring Mg as a co-factor driving K into cells and Na +fluid out, carbohydrate and insulin secretion drives K into cells as it’s required for ATP. Results in increased cellular uptake of glucose, K, Mg, Phosphate + reduction in extracellular concentrations
What are some effects of Refeeding syndrome?
Hypokalaemia Hypomagnesaemia Hypophosphataemia Thiamine deficiency Salt + water retention - oedema
What are the criteria for defining the risk of Refeeding syndrome?
At risk:
Very little or no food intake for > 5 days
High risk: 1 of the following: BMI < 16 kg/m2 Unintentional weight loss > 15 % 3 – 6 /12 Very little / no nutrition > 10 days Low K+, Mg2+, PO4 prior to feeding
Or 2 of the following:
BMI < 18.5 kg/m2
Unintentional weight loss > 10 % 3 – 6 / 12
Very little / no nutrition > 5 days
PMHx alcohol abuse or drugs (insulin, chemotherapy, antacids, diuretics)
Extremely high risk:
BMI < 14 kg/m2
Negligible intake > 15 day
What is the management of Refeeding syndrome?
Start 10-20 kCal/kg CHO 40-50% energy
Micronutrients from onset of feeding
Correct & Monitor electrolytes daily following Trust Policy
Administer thiamine from the onset of feeding following trust policy.
Monitor fluid shifts & minimize risk of fluid & Na+ overload.
