20.1 Pediatric Acute & Critical Care Nutrition: Enteral, Parenteral & Refeeding Management
Key Takeaways
Screen for nutrition risk and confirm undernutrition with age-appropriate measurements, intake and growth trends. Fluid shifts can obscure weight change.
Use reliable indirect calorimetry to estimate resting energy expenditure or Schofield/WHO without a stress factor. Individualize energy and protein by phase and organ support.
Start enteral nutrition early when perfusion and gut function allow. Stable vasoactive support can be compatible with cautious feeding and close reassessment.
Individualize PN timing, check final admixture compatibility with the access and calculate total dextrose delivery. Review lipid labeling and individual trace elements when cholestasis develops.
For high refeeding risk, check phosphorus, magnesium and potassium, give thiamine before planned carbohydrate, and advance nutrition according to serial findings.
Pediatric Critical Care Nutrition
Quick Answer: Screen for nutrition risk and assess growth, recent intake and fluid status. Use measured resting energy expenditure when reliable, advance enteral nutrition when perfusion and gut function permit, and individualize parenteral nutrition timing. Check the final admixture, total glucose delivery and product-specific lipid precautions. For a child at high risk of refeeding syndrome, check phosphorus, magnesium and potassium, give thiamine and start nutrition under close monitoring.
Assess nutrition risk and diagnose undernutrition
Risk screening flags children for further evaluation. A hospital tool such as STRONGkids uses disease risk, intake, weight history and clinical assessment. The Academy/ASPEN consensus indicators support diagnosis and documentation in children aged one month to 18 years. Obtain a detailed assessment within 48 hours of PICU admission and reevaluate at least weekly during the stay, as recommended by SCCM/ASPEN. Ask about growth, baseline intake, feeding access, recent losses and disease burden. Account for edema and fluid shifts when choosing the weight to interpret. Use WHO growth standards from birth to age two and CDC charts from age two in routine U.S. practice. STRONGkids study · Academy/ASPEN diagnostic indicators · SCCM/ASPEN PICU guidance · CDC growth chart guidance
| Diagnostic indicator | Mild | Moderate | Severe |
|---|---|---|---|
| Weight-for-length/height, BMI-for-age or appropriate mid-upper arm circumference z-score | −1 to −1.9 | −2 to −2.9 | −3 or lower |
| Serial loss of usual body weight in an older child | 5% | 7.5% | 10% |
| Serial decline in weight-for-length/height z-score | 1 | 2 | 3 |
| Weight gain velocity under age two, as proportion of expected gain | Below 75% | Below 50% | Below 25% |
| Intake compared with estimated energy or protein need | 51–75% | 26–50% | At most 25% |
Use age-appropriate measurements and the most reliable available trends. The consensus identifies mid-upper arm circumference as an independent indicator using the WHO standard at ages 6–59 months. A length- or height-for-age z-score of −3 or lower is a separate severe indicator in the consensus table. Interpret short stature in the context of linear growth and other causes. For example, edema may mask weight loss after resuscitation. Review the pre-illness growth curve and intake before interpreting an apparently reassuring weight. Albumin and prealbumin respond to inflammation and should not be used to diagnose undernutrition or estimate lean mass. Academy/ASPEN diagnostic indicators · ASPEN visceral protein position paper
Estimate energy and deliver protein by phase
Acute critical illness can increase endogenous glucose production, insulin resistance and protein breakdown. Additional calories may not suppress those processes and can worsen hyperglycemia or excess carbon dioxide production. During recovery, reassess the prescription for activity, rehabilitation and growth.
- Energy: Indirect calorimetry measures oxygen consumption and carbon dioxide production to estimate resting energy expenditure (REE). Check measurement quality with circuit leaks, high inspired oxygen, nonsteady conditions or extracorporeal gas exchange. The measured gas-exchange ratio, carbon dioxide output divided by oxygen uptake, helps interpret a study. A single ratio cannot diagnose overfeeding or underfeeding. In one pediatric study, the measured ratio did not correlate with energy balance. If measurement is unavailable or invalid, use the Schofield or WHO equation without an added stress factor and reassess as illness changes.
- Timing: ESPNIC advises keeping acute-phase energy at or below REE. SCCM/ASPEN suggests aiming to deliver at least two-thirds of the individually prescribed energy by the end of week one when safe. This is a weak recommendation based on observational data. Refeeding risk, tolerance and phase of illness can limit advancement.
- Protein: SCCM/ASPEN recommends a minimum target of 1.5 g/kg/day for its general PICU population older than one month and younger than 18 years. Neonates and diagnosis-specific groups such as children with burns need separate guidance. ESPNIC considers this a minimum enteral target to limit negative protein balance and found insufficient evidence for routinely giving additional protein during acute illness. Individualize the prescription in infants, burns and kidney replacement therapy. Continuous kidney replacement therapy (CKRT) can remove amino acids. Use the child's age, catabolic state, dialysis prescription and serial assessments with nutrition and nephrology.
SCCM/ASPEN PICU guidance · ESPNIC position statement · Pediatric energy balance study · Pediatric Renal Nutrition Taskforce AKI recommendations
Start and advance enteral nutrition safely
Prefer enteral nutrition (EN) when the gut can be used. SCCM/ASPEN supports initiation within 24–48 hours in suitable PICU patients. ESPNIC recommends starting within 24 hours when feasible and supports early feeding on stable hemodynamic support. Assess the trend in perfusion, vasoactive doses and abdominal findings together. Ongoing shock with poor perfusion or escalating support, suspected bowel ischemia, obstruction or active NEC requires reassessment before feeding. A stable vasoactive infusion can be compatible with a cautious start. A dose or lactate in isolation cannot establish that feeding is safe.
Gastric feeding is usually the first route. Consider post-pyloric delivery for substantial aspiration risk or persistent gastric intolerance. Use an age-appropriate standard feed when suitable and consider peptide-based or more concentrated feeds for selected intolerance or fluid restriction. Advance stepwise and reassess emesis, distension, pain, bleeding and perfusion. ESPNIC advises against routine gastric residual checks. In the 2026 GASTRIC-PICU trial of invasively ventilated children receiving gastric feeds, omitting routine checks was noninferior to six-hourly checks on a 30-day composite of survival and time free from mechanical ventilation. The trial excluded recent or current gut pathology or surgery and post-pyloric feeding. Evaluate new symptoms regardless of the residual policy. SCCM/ASPEN PICU guidance · ESPNIC position statement · GASTRIC-PICU trial
Plan parenteral nutrition and safe access
Consider parenteral nutrition (PN) when EN is contraindicated or insufficient over time. PEPaNIC found fewer new infections and a shorter PICU stay when supplemental PN was withheld during the first week compared with initiation within 24 hours. A subgroup analysis supported delay in children undernourished at admission. SCCM/ASPEN advises against routine initiation within 24 hours and supports considering PN during week one for selected children with severe malnutrition or a risk of nutritional deterioration when EN cannot advance beyond small volumes. ESPNIC allows withholding supplemental PN for up to a week in critically ill term neonates and children while providing micronutrients. The study does not set a universal schedule for preterm NICU nutrition or established intestinal failure. Review enteral progress, glucose, micronutrients and baseline nutritional risk with the nutrition team.
Peripheral PN can bridge selected short-term needs if the final formulation fits the access. ASPEN suggests up to 900 mOsm/L for peripheral PN, with weak evidence. The European pediatric guideline advises below 900 mOsm/L. Some U.S. dextrose product labels are more restrictive and specify central delivery by final dextrose concentration as well as osmolarity. Pharmacy should verify the final admixture against product labeling and local policy. Use central access for a nonperipherally compatible admixture. SCCM/ASPEN PICU guidance · ESPNIC position statement · PEPaNIC trial · PEPaNIC undernutrition subgroup · ASPEN PN safety guidance · European pediatric PN complications guideline · Example U.S. dextrose label
Calculate total glucose and energy delivery
A dextrose concentration of 1% supplies 10 mg/mL. Use the final concentration in each infusion and add concurrent IV dextrose sources. In cyclic PN, use the actual rate for the interval being assessed.
Age, weight and phase of illness affect glucose tolerance. Review actual intake, glucose trends, medications and renal support before changing the prescription. SCCM recommends a protocol for persistent glucose at or above 180 mg/dL in critically ill children and advises against intensive 80–139 mg/dL control compared with conventional 140–200 mg/dL control in its pediatric population. If PN stops unexpectedly, check glucose and use the interruption plan. Consider taper or prescribed substitute dextrose for children at risk, especially young children. Match the intended glucose delivery and fluid allowance. European pediatric PN carbohydrate guideline · SCCM glycemic guidance · Pediatric PN interruption study
Worked example. A 20-kg child on CKRT has a measured REE of 950 kcal/day, and the team has determined PN is now indicated. An illustrative amino acid dose of 2.5 g/kg/day provides 50 g or about 200 kcal/day. At 50 mL/h for 24 hours, a final dextrose concentration of 15% supplies 180 g/day or 612 kcal/day at 3.4 kcal/g. GIR is mg/kg/min. A separate 20% mixed lipid emulsion at 1.5 g/kg/day contributes 30 g in 150 mL, or 300 kcal at 2 kcal/mL. Total delivery is 1,112 kcal/day before other sources.
If the team chooses to reduce dextrose and keep the same infusion rate and other components, a final dextrose concentration of 11% supplies 132 g/day or 448.8 kcal/day, with GIR about 4.58 mg/kg/min. Total energy becomes about 949 kcal/day. This arithmetic compares prescriptions. The bedside plan also depends on illness phase, glucose tolerance, additional energy sources and total fluid, which is already 1,350 mL/day before other infusions. Pediatric CKRT nutrition consensus · Pediatric PN energy calculation · U.S. dextrose label · U.S. SMOFlipid label
Respond to cholestasis and monitor complications
| Finding | Clinical decision |
|---|---|
| Rising conjugated bilirubin on prolonged PN | Assess intestinal failure-associated liver disease and alternative or contributing causes, including infection and biliary disease. Review overfeeding, enteral advancement and the lipid strategy with the intestinal rehabilitation team. |
| Lipid selection | SMOFlipid contains soybean, medium-chain triglyceride, olive and fish oils and is a source of calories and essential fatty acids. Its label reports less cholestasis than soybean-only lipid in a neonatal/infant trial. Pure fish oil (Omegaven) has a separate U.S. pediatric indication for PN-associated cholestasis (PNAC). Its label recommends initiation at direct or conjugated bilirubin at least 2 mg/dL with at least two more weeks of expected PN dependence, at 1 g/kg/day. It is not indicated for prevention. Use product-specific doses and monitoring. For example, the Omegaven label advises considering a four-hour pause and repeat measurement for triglycerides above 250 mg/dL in neonates and infants or above 400 mg/dL in older children. |
| Copper and manganese | In cholestasis, European pediatric guidance recommends measuring blood manganese and discontinuing added parenteral manganese. Follow copper and ceruloplasmin and individualize copper because both accumulation and deficiency are possible, especially with intestinal losses. Separate trace elements when a fixed mixture cannot meet these needs. |
| Metabolic and catheter complications | Follow glucose, electrolytes, triglycerides, liver tests and fluid balance. Use product- and age-specific triglyceride action thresholds and assess other causes of elevation. Pharmacy checks calcium–phosphate compatibility. Use aseptic line care and evaluate fever or dysfunction for infection or thrombosis. |
U.S. SMOFlipid label · U.S. Omegaven label · European pediatric trace-element guideline · ASPEN PN safety guidance
Prevent and recognize refeeding syndrome
Prolonged low intake can deplete total-body phosphorus, potassium and magnesium despite normal serum concentrations. Carbohydrate reintroduction raises insulin and drives these electrolytes into cells. Thiamine can already be depleted, and carbohydrate metabolism increases the need for it. Watch for weakness, respiratory failure, arrhythmia, fluid overload or neurologic changes. ASPEN's definition considers a fall in one or more of these electrolytes within five days of calorie reintroduction, with organ dysfunction attributable to those changes or thiamine deficiency contributing to severe classification.
- Assess risk and prepare. Look for recent growth deterioration, little intake, muscle or fat loss, electrolyte deficits and conditions such as malabsorption. In ASPEN's pediatric risk table, more than seven consecutive days below 75% of estimated energy or protein needs is one significant-risk criterion. Obtain baseline phosphorus, potassium and magnesium. Give thiamine before planned feeds or IV dextrose for high-risk patients, using the pediatric consensus dose of 2 mg/kg with a protocol-selected maximum of 100–200 mg/day. Continue supplementation for five to seven days or longer when severe starvation or thiamine deficiency risk persists. Treat emergency hypoglycemia promptly.
- Start and adjust. For at-risk pediatric patients, ASPEN suggests starting at no more than 40–50% of goal, including calories from IV dextrose and dextrose-containing drugs. Choose a starting delivery appropriate to the child's illness and glucose tolerance. Correct electrolyte deficits and monitor at least every 12 hours for the first three days in high-risk children, more often when needed. If electrolytes fall sharply or are difficult to correct, reduce caloric or dextrose delivery and individualize advancement. Severe or life-threatening depletion may require holding nutrition while treating it.
- Apply the right population. A child with prolonged minimal intake from active Crohn disease is outside the monitored eating-disorder refeeding trial. Use the pediatric refeeding risk and surveillance plan in this scenario. In the separate eating-disorders section, higher-calorie inpatient refeeding applies to the trial population and its monitoring.
ASPEN pediatric refeeding consensus · Children's Healthcare of Atlanta pediatric refeeding pathway · StRONG trial
A ventilated 4-year-old is 30 hours into a PICU admission for septic shock. After resuscitation the child has improving capillary refill, preserved urine output and falling lactate on a stable norepinephrine infusion. The abdomen is soft without distension or bleeding. The team finds no other enteral contraindication. Which nutrition plan is appropriate?
Defer enteral feeding until the child has been off all vasoactive support for 24 hours.
Begin cautious gastric enteral feeding and reassess perfusion and tolerance as feeds advance.
Start full-calorie PN now using a stress factor of 1.5 times the Schofield estimate.
Require post-pyloric access before starting feeds because the child is mechanically ventilated.
An 8-kg, 10-month-old with short bowel syndrome has needed PN for six weeks. Direct bilirubin has risen to 4.8 mg/dL, and PN is expected to continue for several weeks. The final central PN admixture contains 20% dextrose running continuously at 36 mL/h, with soybean-oil lipid and standard trace elements. Which assessment and plan best address the findings?
GIR is 7.5 mg/kg/min. Increase soybean lipid and leave the dextrose and trace prescription unreviewed.
GIR is 15 mg/kg/min. Move the current admixture to a peripheral vein to reduce hepatic exposure.
GIR is 15 mg/kg/min. Stop all dextrose abruptly and withhold both manganese and copper indefinitely.
GIR is 15 mg/kg/min. Review total energy and cholestasis causes, consider a PNAC-directed lipid strategy, and manage manganese and copper separately.
A 13-year-old with Crohn disease weighs 34 kg. BMI-for-age z-score is −3.4, and she has consumed very little for 12 days. Perfusion and glucose are currently stable. What should the team do before planned nutritional rehabilitation?
Check phosphorus, magnesium and potassium, give thiamine, and start a monitored, individualized refeeding plan that includes IV dextrose calories.
Start full carbohydrate delivery once the baseline glucose is normal and obtain electrolytes after several days.
Use the anorexia nervosa higher-calorie trial regimen on the basis of age alone.
Use albumin and prealbumin to determine refeeding safety and replace electrolytes only if symptoms develop.
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