Nutrition in critically ill patients

Nutrition In Critically Ill Patients
Dr. Dharmendra Yadav, Assi. Prof.
Department of Anaesthesiology and Critical Care
M.L.N. Medical College, Allahabad
1

Introduction
 Nutritional Support has become a routine part of the care of critically ill
patients
 Nutritional Support refers to enteral, parenteral provision of calories,
proteins, electrolytes, vitamins, minerals, trace elements and fluids.
 These patients are hyper metabolic and have increased nutritional
requirements.
 In critically ill patients malnutrition develop rapidly due to the presence
of acute phase responses, which not only promote catabolism but also
alter the response to nutritional support.
 Malnutrition once established exerts well-known deleterious effects by
altering immunity, increasing susceptibility to nosocomial infections,
decreasing wound healing and promoting organ failure.
2

A Practical Approach During Nutrition.
 When should nutrition supplementation be initiated .
 Which route should be used for the delivery of nutrient.
 What special precaution should be taken before initiating
supplementation in the patients (Diabetic background,
Cardiac Diseases, Chronic Renal Failure).
 Termination of Parenteral Nutrition
.
3

Assessment of Nutritional Status
Nutritional Assessment in critically ill patient is very difficult. These are
summarized as- A,B,C,D
 Anthropometric Measurements: It measures the current nutritional
status
Body Weight: 10% loss is considered SIGNIFICANT
20% loss is considered CRITICAL
30% loss is considered LETHAL
Mid-Arm Circumference
Skinfold thickness
Head-Circumference
Head Chest Ratio
Nutritional Indices:BMI Body Mass Index (BMI)
BMI= Weight in Kg/ Height in m2
It is an independent predictor of mortality in seriously ill ‘
patients.
4

Biochemical tools: Hemoglobin
Albumin
Transferrin
Pre-albumin
Lymphocyte Count
 Clinical Assessment: It is simplest and most practical method.
Good nutritional History
General physical examination
Loss of subcutaneous fat( chest and triceps)
Oedema
Ascitis
 Dietary Assessment: It can be assessed by 24 hrs dietary recall
Food frequencies
Food daily Technique
Observed food consumption 5

Nutritional Requirements:
To actually measure energy requirements we need sophisticated equipment.
Requirements are most often calculated using formulae.
One such formula is the Harris-Benedict Equation which estimates the basal
energy expenditure (BEE) in Kcal/day
Harris Benedict equation (BEE)
For men: 66+(13.7xwt)+(5xht)-(6.7xAge)
ForWomen: 655+(9.6xwt)+(1.8xht)-(4.7xAge)
Resting energy expenditure (REE) in Kcal/24hr
REE=BEEX1.2 [(3.9xVO2)+(1.1xVCO2)-61] X1440
6

Modifications in BEE
 Fever BEEx1.1
 Mild Stress BEEX1.2
 Moderate Stress BEEX1.4
 Severe StressBEEX1.6
7

Total Energy and fluid requirements:
 Energy requirements can be calculated in various ways but
for all practical purposes- calorie intake is -
 25Kcal/Kg/24 hr post elective Surgery
 35Kcal/Kg/24 hr Polytrauma Sepsis and burns
 Additional 10% calories added for each 10C rise in
temperature
 Baseline water requirements for adults = 30-35 ml/kg/hr
 Addition must be made for fever (300-500ml/24 hr) for 10C
above normal and for other losses.
8

 A careful balance of macro-nutrients (protein, lipids
and carbohydrates) provide the energy requirements
whilst micronutrients (Vitamins and minerals) are
required in very small amounts to maintain health .
 Proteins: Proteins provide 10-15% of total calories.
Daily requirements of proteins-
 .8-1.2 g/kg Normal Metabolism
 1.2-1.6gm/Kg- Hypercatabolism
 Nitrogen Balance:-2/3rd of nitrogen derived from
protein is excreted in the urine.
9

 Because protein is 16% Nitrogen, each gm of urinary
nitrogen represents 6.25gm of degraded proteins.
 N Balance(g)=(Protein intake(g)/6.25)-(UUN+4)
 Positive Nitrogen Balance:Provide enough non-protein
calories
 Negative Nitrogen Balance: insufficient intake of non-protein
calories
 The goal of nitrogen balance is to maintain a positive
balance of 4-6gms
10

 Carbohydrate: It Provides upto 50-60% of total calories or
70-90% of non-protein calories
 It provides 3.4 Kcal /g of glucose
 The total glucose load may be limited to 3.5-5gm/Kg/24hr
depending upon severity of stress
 Lipids: Lipid emulsion provides 25-30% of total energy.
Maximum dose should be limited to 1gm/kg/24hr
It provides 9.3 Kcal/gm
11

Micronutrients:
Usually act as co-factors for enzymes, involved in
metabolic pathway or structurally integral part of enzymes
and are often involved in electron transfer. Their daily
requirements given in table
12

Daily requirements for electrolytes
 NUTRIENT Enteral route Parenteral Route
 Sodium 500mg (22mEq/Kg) 1-2mEq/Kg
 Potassium 2g (51mEq/Kg) 1-2mEq/Kg
 Chloride 750 mg(21mEq/Kg) As needed to maintain acid-base bal.
 Calcium 1200mg (30mEq/Kg) 5-7.5mEq/Kg
 Magnesium 420mg(17mEq/Kg) 4-10mEq/Kg
 Phosphorus 700mg(23Meq/Kg) 20-40mEq/Kg
13

Daily requirements for trace elements
 Enteral route Parenteral Route
 Chromium 30mcg 10-15mcg
 Copper 0.9mg 0.3-0.5mg
 Fluoride 4 mg Not well defined
 Iodine 150mcg Not well defined
 Iron 18mg Not well defined
 Manganese 2.3mg 60-100mcg
 Molybdenum 45mcg Not well defined
 Selenium 55mcg 20-60mcg
 Zinc 11mg 0.5-5mg
14

Daily Requirement of Vitamins
 Water Soluble Vitamins Enteral route Parenteral
 Thiamine B1 1.2mg 3.0mg
 Riboflavin B2 1.3mg 3-6mg
 Pantothenic acid 5mg 15mg
 Niacin 16mg 40mg
 Pyridoxine B6 1.7mg 4mg
 Biotin B7 30mcg 60mcg
 Folic Acid B10 400mcg 400mcg
 Cyanocobalamine B12 2.4mcg 5mcg
 Ascorbic acid C 90mg 100mg
 Fat Soluble Vitamin
 Retinoic Acid A 900mcg 1000mcg
 Ergocalciferol D 15mcg 5mcg
 Alpha-tocopherol E 15mg 10mg
 Phytomenadione K 120mcg 1mg/24hr
15

TIME TO START NUTRITION
 The timing of initiating nutritional support is a
complex issue involving various factors which includes
–
 -Preillness nutritional status
 -Type severity and stage of critical illness and organ
failure
 -Route of feeding and use of special diets.
16

In general
 Early Feeding –Beginning of nutrition within 24-48
hrs after an acute onset.
 Conventional Feeding:Initiating nutrition within 3-10
days.
 Late Feeding: Refers to the nutrition after the 10 days.
17

Early Enteral Nutrition:
 Indication: Severe trauma (abdominal, major burns)
 ARDS( acute respiratory distress syndrome)
 Major abdominal Cancer surgery
 Acute Malnutrition
 Contra-indication: Loss of Bowel anatomical integrity
 Severe Splanchnic Ischemia
 Shock
 Generalised Peritonitis
 Early pareneteral nutrition has no place in the ICU in
patients without pre-existing malnutrition.
18

Route of Nutrition
 Nutritional Support can be given through one of the
three routes-
 Oral
 Enteral
 Parenteral
 Oral: If the patient can eat then they should be
encouraged to do so. It is important to know that
patient receiving adequate nutrition or not.
19

Enteral:
Indication: when oral intake has been inadequate for 1-
3 days. Patients who are at risk of bacterial
translocation across the bowel (Burn Victims).
Contraindications:
 Circulatory Shock
 Intestinal Ischemia
 Complete mechanical bowel obstruction or Ileus .
 Severe Diarhhoea
 Pancreatitis.
20

Methods of enteral feeding
 Nasogastric Tube : most common method
 Naso-duodenostomy tube
 Naso-jejunal tube
 Percutaneous feeding gastrostomy
 Jejunostomy tube.
21

Modes of administration :
 Bolus Feeding :
administration of 200-400ml of feed over 20-30 minutes
several times a day.
 Intermittent feeding-
Administartion of 200-400 ml of feed over 30-60
minutes several times a day.
 Continuous Feeding:
Feed given at continuous rate over 16-24 hrs per day.It is
preferred for small-intestine feeding.
22

Feeding Formulas for enteral Feeding
 There are many commercially prepared feeds available:
 Polymeric Preparation: These contain intact proteins, fat and
carbohydrate which requires digestion prior to absorption, in
addition to electrolytes, trace elements, vitamins and fibers. These
feed tend to be lactose free as lactose intolerance is common in
unwell patients.
 Elemental Preparation: These preparations contain the
macronutrients in absorbable form (i.e. proteins as peptides or amino
acids, lipids as medium chain triglycerides and carbohydrates as
mono- and disaccharides. 23

Disease specific formulae:
 These are usually polymeric and feed designed for :
 Liver diseases: Low sodium and altered amino-acids
contents
( to reduce encephalopathy)
 Renal Disease: Low phosphate and Potassium
2kcal/ml
(to reduce fluid intake)
 Respiratory Disease: High fat Content reduce CO2
production
24

SPECIFIC ADDITIVES:
 Glutamine: Principal food for bowel mucosa. Essential for
hypermetabolic, stressed patients.
 Dietary Fiberss: Fragmented fibers.- Cellulose, pectin, gums
Non-Fragmented fibers- Lignin
 Fibers have several action that can reduce the tendency for
diarrhea.
 Branched chain amino-aids:Leucine, Isoleucine and valine for
trauma and hepatic encephalopathy patients.
 Carnitine: Necessary for transport of fatty acids into
mitochondria for fatty acid oxidation. Carnitine deficiency
occurs in cardiomyopathy, skeletal muscle myopathy and
hypoglycemia.
25

How to give enteral nutrition?
 Confirm tube position: Clinically and radiographically if
possible.
 Secure the tube well.
 Sit patient up- At least 300 to minimize the risk of reflux
and aspiration of gastric contents
 Aspirate regularly (e.g. 4 hourly) to ensure that gastric
residual volume is less than 200ml.
 Avoid bolus feeding: Large volume of feed in stomach will
increase the risk of aspiration of gastric content
 Use-Pro-kinetics : If patient not tolerated enteral feed then
prokinetics given : Metoclopramide 10mg iv tds
26

Complications of Enteral Feeding:
 Occlusion of the feeding tube
 Reflux of the gastric contents into the airway
 Diarrhoea
 Bloating and abdominal discomfort.
27

Parenteral Nutrition:
 The only absolute indication of parenteral nutrition is
gasto-intestinal failure.
 Parenteral Nutrition can be given as separate
components but is more commonly given as a sterile
emulsion of water, protein, lipids, carbohydrates,
electrolytes, vitamins and trace elements.
 Route of Infusion:
 peripheral
 central
28

Peripheral Parenteral Nutrition PPN:
 The maximum osmolarity that can be tolerated by
peripheral vein is 900 mosm/L.
 The concentration of various solutions that can be given
safely via peripheral veins are –
Glucose-5-10%
Amino-acids- 2-4%
Lipids-10-20% as both concentration are iso-osmolar.
 PPN is unsuitable for patients –
Poor peripheral venous access
High energy and nitrogen requirements
High Fluid requirements
Requiring nutrition for longer time.
29

Central Parenteral Nutrition: CPN
 IV catheter should be inserted under all aseptic
conditions
 It should be used only for purpose of parenteral
nutrition.
 Confirm the position of catheter by X-ray Chest .
30

INTRAVENOUS NUTRIENT SOLUTIONS:
 Carbohydrates:These are provided by dextrose
solutions. These are available as 5%,10%,20%,50%,70%
 Proteins: These are given as amino acid solution .
They Contain 50% essential and semi-essential amino
acid
 Lipids: Intravenous Lipid Emulsions consists of
submicron droplets of cholesterol and phospholipids
surrounding a core of Long Chain Triglycerides. It is
available in 10% and 20% Strength.
 It provides a source of essential fatty acids –linolenic
acid (w-3 fatty acid) and linoleic(w-6 fatty acid)
 Electrolytes and micronutrients As given in Table. 31

TERMINATION OF PARENTERAL
NUTRITION
 Goal: to restart oral/ enteral feeding as soon as gastro-intestinal
function improves.
 Gradual transition from PN to oral/ enteral nutrition
 Reduce infusion rate upto 50% for 1-2hrs before
stopping
 When 60% of total energy and protein requirements
are taken orally/ enterally. PN may be stopped.
32

COMPLICATIONOF TPN:
 Catheter related: Pneumothorax, Hemothorax,
Chylothorax, Air embolism, Cardiac Tamponade,
Catheter sepsis.
 Metabolic:Azotemia, Hepatic Dysfunction,
Cholestasis, Hyperglycemia/ Hypoglycemia, excessive
CO2 production, metabolic acidosis/alkalosis,
electrolyte imbalances.
 Refeeding Syndrome
 Overfeeding
33

MONITORING OF PATIENTS:
 Vital Signs: Temperature, blood pressure, pulse, respiratory rate
 Fluid balance-Weight , edema, input-output.
 Delivery equipment: Nutrient Composition, tubing, pumps, catheter, dressing
 On first day measure blood sugar every 6hrs for 24hrs
 During first week measure serum electrolytes, blood urea, sugar and serum
triglycerides daily.
 Unstable patients may require blood sugar and serum electrolytes measurements
twice daily.
 Serum Calcium, AST, bilirubin, alkaline phosphate, phosphorus magnesium and
blood counts at least twice a week.
 Prothrombin time and albumin once a week
 Once the desired infusion rate of TPN has been achieved and blood chemistry is
Normal monitoring may be reduced to once a week.
34

CONCLUSION:
 Malnutrition is associated with a poor outcome in
critical illness.
 Enteral Nutrition is mainstay of nutritional support
and should be started early in all patients in whome it
is safe to do so.
 Parenteral nutrition has definite role but only in
selected patients.
 In all patients receiving nutritional support it is vital
to achieve glucose control with insulin therapy and
important not to overfeed.
35

 Reference:
 Alverdy C, Burke D. Total Parenteral Nutrition 1992 8:359-
365
 Marik PE, Zolugo GP. Early Enteral Nutrition in acutely ill
patients. Crit care Med 2001,29,2264-2270.
 Marfilj. Enteral vs Parenteral Nutrition British Journal
Surgery 2000 87:1121-1122
 Jooske CA, Moustoe J, Collee G. Intensicve cared Medicine
1999 25:464 -468
 Kennedy BC, Hall GM Br.J.Anaesthesia 2000 85: 185-187
36

Nutrition in critically ill patients

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Nutrition in critically ill patients