Parenteral nutrition in neonates — case

Case summary

A 780 g male infant is born at 26 weeks' gestation to a 28-year-old primigravida who presented in preterm labour. He is intubated and given surfactant for respiratory distress syndrome, and a umbilical venous catheter is sited at one hour of age. The team asks you to start parenteral nutrition and build the pathway to full enteral feeding. [2] [1]

Candidate tasks

1. Take a focused history and assess the infant; formulate a one-line problem representation. [2]
2. Outline the parenteral nutrition prescription for the first week, including targets and monitoring. [4]
3. Counsel the parents about the nutrition plan, the complications to watch for, and the longer-term outlook. [3]

Focused history and assessment

• Antenatal and perinatal: gestation, birthweight centile, reason for preterm delivery, antenatal steroids, intrapartum course, Apgar scores, resuscitation and surfactant. [2]
• Anthropometry: weight, length and head circumference on a gestation- and sex-specific (Fenton) chart; the daily weight trend is the ultimate judge of whether the prescription is working. [4]
• Access and line: confirm central access (umbilical venous catheter now, peripherally inserted central catheter to follow), the line site and dressing, and the no-break policy. [5]
• Metabolic and sepsis watch: glucose stability, the metabolic panel, triglycerides, and any sign of line sepsis, lipid intolerance or refeeding. [5]

One-line summary: "A 780 g 26-week male with respiratory distress syndrome, intubated and surfactanted, with a umbilical venous catheter in situ at one hour of age — an extreme preterm needing early aggressive parenteral nutrition as a bridge to enteral feeding, with protection of the line and liver throughout." [2]

The parenteral nutrition prescription

• Day one: start amino acids at 1.5 to 2 g/kg/day, a glucose infusion rate of 4 to 6 mg/kg/min, and lipid at 1 to 2 g/kg/day, via the central line. [4]
• Advance over the first days to the ESPGHAN targets: amino acids 3 to 3.5 g/kg/day, glucose infusion rate 10 to 12 mg/kg/min, lipid 3 to 3.5 g/kg/day, energy 110 to 135 kcal/kg/day; add electrolytes, calcium, phosphate, trace elements and vitamins. [4]
• Monitor daily: glucose each shift, daily weight, the metabolic panel, triglycerides when advancing lipid, and liver function from the second week; check the line site and watch for sepsis. [5]
• Protect the line and liver: a dedicated PN lumen and a no-break policy to prevent catheter-related bloodstream infection; advance enteral as early and as fast as safely possible and restrain the soybean-lipid dose to prevent IFALD. [5]
• Transition and wean: start minimal enteral or trophic feeds, advance 20 to 30 mL/kg/day as tolerated, and wean PN reciprocally — halving it at around half enteral and stopping at full enteral feeding (120 to 150 mL/kg/day). [1]

Counselling the parents

• Explain clearly that their baby was born so early that the gut cannot yet absorb enough food, so the team feeds the baby through a vein — building up the protein, sugar and fat the brain needs to grow — while the gut gradually takes over. [2]
• Set immediate expectations: the team will start the intravenous nutrition within hours, check the blood sugars and salts every day, weigh the baby daily, and begin tiny milk feeds through a feeding tube as the gut matures, reducing the intravenous nutrition as the milk feeds increase. [4]
• Be honest about the complications: the central line can become infected, the liver can be affected by the nutrition (cholestasis), and the blood sugars and fats need careful watching — which is exactly why the team monitors so closely and changes the prescription every day. [5]
• Frame the outlook honestly: most very preterm babies move from intravenous to full milk feeding over weeks and grow well, but the very smallest and those with bowel problems may need nutrition support for much longer — and the team will guide them through each step. Reassure about expressed breast milk, invite questions, check understanding, and offer written information and a follow-up contact with clear safety-netting on the signs to return for. [3]