Parenteral Nutrition Monitoring and Weaning

UHL Childrens Hospital Guideline

Parenteral nutrition (PN) is a lifesaving therapy for children who cannot meet their nutritional needs enterally. The UHL Childrens Hospital guideline provides a systematic approach for safe initiation, ongoing monitoring, and timely weaning of PN in the pediatric population. This page summarises the essential components of the guideline, including clinical indications, monitoring parameters, laboratory targets, complications, and a stepwise weaning protocol.

1. Indications for Parenteral Nutrition

• Inability to meet >60% of caloric needs via the gastrointestinal (GI) tract for 7days.
• Severe malabsorption syndromes (e.g., short bowel syndrome, congenital enteropathies).
• Highoutput fistulas or major GI surgery with delayed enteral tolerance.
• Critical illness with anticipated prolonged nil per os (NPO) status.
• Severe metabolic disorders requiring controlled nutrient delivery.

2. Initiation of PN

PN should be started after assessing fluid status, electrolyte balance, and baseline labs. The initial prescription includes:

• Energy: 6080% of estimated resting energy expenditure (REE) for the first 48h, advancing to 100% as tolerated.
• Protein: 1.52.0gkgday (adjusted for age and catabolic state).
• Carbohydrates: 46mgkgmin of dextrose, not exceeding 1214mgkgmin.
• Lipids: 12gkgday (typically 20% or 30% emulsion).
• Electrolytes, trace elements, vitamins as per agespecific recommendations.

3. Monitoring Framework

Monitoring is divided into daily clinical checks, laboratory surveillance, and weekly comprehensive reviews.

3.1 Clinical Monitoring (Daily)

• Vital signs and fluid balance (intake/output, weight change).
• Catheter site inspection for signs of infection.
• Gastrointestinal tolerance (presence of gastric residuals, abdominal distention, stool output).
• Skin integrity (especially in neonates and infants).

3.2 Laboratory Monitoring (Frequency)

Parameter	Day1	Day23	Day47	Then
Glucose (random)	Every 4h	Every 6h	Every 8h	Every 12h if stable
Electrolytes (Na, K, Cl, HCO)	Every 8h	Every 12h	Daily	Every 48h
Renal function (Urea, Creatinine)	Daily	Daily	Every 48h	Weekly
Liver enzymes (ALT, AST, GGT, ALP, Bilirubin)	Day1, Day3	Day5	Weekly	Monthly
Triglycerides	After first lipid infusion	Day3	Weekly	Monthly
Complete blood count (CBC)	Day1, Day3	Weekly	Then as clinically indicated
Prealbumin / Albumin	Baseline, Day7	Weekly thereafter

3.3 Target Ranges

• Glucose: 80150mg/dL (48mmol/L). >180mg/dL warrants insulin infusion or dextrose reduction.
• Serum potassium: 3.55.5mmol/L.
• Serum sodium: 135145mmol/L.
• Triglycerides: <250mg/dL (2.8mmol/L) for standard lipid emulsions.
• ALT/AST: <2upper limit of normal (ULN). Persistent rise suggests PNassociated liver disease (PNALD).
• Prealbumin: >15mg/dL indicates adequate protein status (recognising it is an acutephase reactant).

4. Common Complications & Management

• Catheterrelated bloodstream infection (CRBSI): Immediate culture, start empiric antibiotics, consider line change if no improvement within 48h.
• Hyperglycemia: Reduce dextrose concentration, start insulin infusion with target 100150mg/dL.
• Hypertriglyceridemia: Decrease lipid infusion rate or suspend lipids; reevaluate lipid source (consider fish oilbased emulsions).
• Electrolyte disturbances: Adjust PN electrolyte module; treat underlying renal or hormonal issues.
• PNassociated liver disease: Limit total calories, reduce soybased lipids, increase cycling time, and introduce trophic feeds as early as feasible.

5. Weaning Strategy

Weaning should commence once the child tolerates 60% of estimated needs enterally for 48h without signs of aspiration or severe abdominal distention.

5.1 Stepwise Reduction

1. Day02: Reduce PN calories by 10% per day while increasing enteral volume by an equivalent amount.
2. Day35: Aim for 30% PN, 70% enteral. Monitor glucose and triglycerides closely.
3. Day67: Transition to PN bolus (nightonly infusion) if daytime enteral intake meets >80% of needs.
4. Day810: Discontinue PN if enteral intake stabilises at 100% of calculated requirements for 48h.

5.2 Criteria for Successful Weaning

• Weight gain 2gkgday for two consecutive days.
• Stable or improving laboratory values (glucose, electrolytes, liver function).
• No recurrent abdominal symptoms (vomiting, high residuals, distention).
• Functional central line (if still needed for medications) can be removed after 48h without PN.

5.3 PostWeaning Followup

After PN discontinuation, continue daily weight checks for one week, then weekly for four weeks. Recheck liver function tests at 2weeks and 1month to ensure resolution of any PNrelated changes.

6. Multidisciplinary Team Roles

• Pediatric Gastroenterology/Intensive Care: Overall clinical oversight, decisionmaking on initiation and weaning.
• Clinical Pharmacist: Compounding, compatibility checks, dosing adjustments.
• Dietitian: Energy/protein calculations, formulation of enteral advancement plan.
• Nursing Staff: Line care, infusion pump programming, realtime monitoring.
• Laboratory Services: Prompt turnaround of critical labs, especially glucose and triglycerides.

7. Summary

The UHL Childrens Hospital guideline emphasizes a balanced approach: start PN only when truly indicated, monitor a defined set of clinical and biochemical parameters, intervene early for complications, and initiate weaning as soon as safe enteral nutrition is feasible. Consistent teamwork and adherence to the monitoring schedule lead to reduced infection rates, fewer metabolic derangements, and shorter hospital stays for our pediatric patients.