annette prinsloo rd(sa)) chief dietitian ... - critical care · •postpyloric feeding •nutrition...
TRANSCRIPT
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Annette Prinsloo RD(SA))Chief DietitianChris Hani Baragwanath Academic Hospital
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Goals of nutritional support
• Minimize effect of starvation due to suboptimal feeding
• Prevent overfeeding and underfeeding
• Prevent micronutrient deficiencies
• Sustain organ function
• Prevent dysfunction of the cardiovascular, respiratory and immune systems until the acute phase inflammatory response resolves
• Maintain lean body mass
• Improve muscle function
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Nutritional status
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Nutritional status
Double burden: PEM vs Obesity
Nutritional status is determined using z-scores:
W//L < - 2 z scoreBMI//age < -2 z score
BMI//age > + 2 z score
MALNOURISHED
OBESE
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Trends in the prevalence of under nutrition in children, SA 2005 – 2012
(SANHANES)
1 -3 years 4 – 6 years
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Prevalence of overweight and obesity in children aged 2 – 14 years, SA 2012
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Scenarios
• Malnourished child on admission – risk of refeeding
syndrome
• Child becoming malnourished during admission
• Overweight/obese child – greater risks for complications increased length of stay, and loss of muscle tissue
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Obese children
“There is not adequate evidence to assess the
clinical outcomes of hypocaloric or hypercaloric
feeding during hospitalization of obese children.
Therefore, the goals for the provision of energy to
pediatric obese inpatients should be similar to the
goals for their nonobese counterparts until more
evidence is available. (Grade: E)”
ASPEN, 2010
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Obese children
Obese children are at increased risk for:
• Anemia
• Low fat-soluble vitamins levels (vitamin D)
• Low vitamin B status
• Hyperlipidemia
• Insulin resistance
• Hyperglycemia
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Weight
Weight measurement can be unreliable in critically ill children with:
• Fluid imbalance from resuscitation fluids
• Volume overload
• Capillary leak with subsequent anasarca
• Diuresis.
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Route and timing
of
nutrition support
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Route of feeding
• EN preferred above PN
• EN infection morbidity
LOS
cost of nutrition
• Supplementary PN (functional GIT) might be required as a result of problems with airway management,
clinical instability, diagnostic procedures etc.
TPN costs (Pediatric) = R 288 – R 1007/ bag
EN costs (Pediatric) = R24 – R60/bag
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EN delivery
Impeding factors
• Feeding intolerance
• Aspiration of gastric
contents
• ICU procedures
Practices to
maximize EN delivery
• Prokinetics
• Postpyloric feeding
• Nutrition algorithms
Optimal EN delivery = 66.6% of daily energy goal in 1st week in ICUMartinez et al. NCP 2014
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Contra indications to EN
Absolute contraindications:
• Paralytic or mechanical ileus
• Intestinal obstruction
• Perforation
• Necrotising enterocolitis.
Relative contraindications include:
• Intestinal dysmotility
• Toxic megacolon
• Peritonitis
• Gastrointestinal bleeding
• High-output enteric fistula
• Severe vomiting
• Intractable diarrhea.
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Trophic feeding
“Even minimal quantities of nutrients in the gastrointestinal tract (trophic feeding) may promote intestinal perfusion, initiate release of enteral hormones and improve gut barrier function”
ESPHGAN 2010
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Hemodynamic stability
• Clinical guidelines recommend EN to be withheld in patients on high dose inotropic support -
risk for subclinical ischemia/ reperfusion injury
• No consensus on the definition of hemodynamic instability
• Pediatric patients requiring cardiovascular medi-cation in the ICU tolerated EN well
– King et al JPEN 2004
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Calculating
nutritional
requirements
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Calculating energy requirements
ENERGY BALANCE
ORGAN SUPPORT (Decrease demand)• Mechanical ventilation• Muscle relaxants• Sedation• Non nutritive calories
STRESS (Increased demand)• Surgery• Illness• Procedures
∆ according to disease severity and interventions
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Distribution of methods used for estimation of energy expenditure in 524 pediatric intensive care unit patients.RDA, Recommended Dietary Allowance; WHO, World Health Organization.
Martinez et al. NCP 2014
46%
26%
1%
27%
Schofield
WHO
Indirect calorimetry
Other- White, Talbot,
Harris Benedict, RDA
other
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Predictive equations
Limitations:
• Based on healthy populations
• Not intended for critically ill patients or patients with develop-mental disorders
• Overestimate energy expenditure overfeeding
• In absence of indirect calorimetry predictive equations
(WHO, Schofield) should be used but without stress factors
• The application of stress and activity factors to BMR leads to
further inaccuracies, and risks overfeeding in most critically ill
children
Skillman & Mehta, Curr Opin in Crit Care, 2012
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Indirect calorimetry
The Gold Standard
Not reliable in children if:
• On an FiO2 > 60%
• Leaks of > 10% from ET tube
• During ECMO
• On CVVHD
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Protein requirements
Estimated protein requirements for injured children per age group:
0–2 years: 2–3 g/kg/day
2–13 years: 1.5–2 g/kg/day
13–18 years: 1.5 g/kg/day.
ASPEN Clinical Guidelines: Metha et al JPEN, 2009
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In a review of protein supplementation trials in
critically ill infants and children, positive protein balance was only achieved in patients receiving a minimum of 57 kcal/kg/day and 1.5 g/kg/day
protein
L. J. Bechard, J Pediatr 2012
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“Enteral diets for infants and children contain aninsufficient protein concentration when a restricted
caloric intake is given as it usually occurs in thecritically ill patient (50–60 % of calories in relation
to their age).”
Urbano J et al, Diet and Nutrition in Critical Care, 2014
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Some studies have found that protein-enriched
diets:
protein synthesis and related biochemical para-
meters,
availability of essential and branched amino acids in plasma
improve nitrogen balance.
Broader studies are needed to assess the impact of diets supplemented with proteins in anthropometric biochemical, and clinical parameters in critically ill
children.
Urbano J et al, Diet and Nutrition in Critical Care, 2014
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Practically……………?
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Monitoring
tolerance
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Gastric residual volumes
• Current recommendations in adults tolerate larger thresholds for GRV’s
• In adults the absence of GRV monitoring was not associated with an in VAP
• GRV monitoring can result in EN interruptions and impede achieving EN goals
• No reference values for GRV’s in children• GRV monitoring not recommended in children
Martinez et al, NCP 2014
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Key messages
• Evidence based guidelines for nutrition support i.t.omacronutrient delivery in the pediatric ICU are lacking.
• Available pediatric products (in SA?) are not in line with current practice.
• Continuous monitoring of nutritional status is essential
to ensure optimal nutrient delivery
• Adult practice guidelines could not summarily
be applied to the pediatric critically ill population.
Thank you! Travel safe! Goodbye!