Clinical Scenario:
A 26-week, 900-g infant is receiving parenteral nutrition containing 10% glucose at 9 mL/kg/hour. After several hours, blood glucose is persistently 14 mmol/L on repeated measurements.
There is no evidence of sepsis, steroid therapy or significant stress-related illness. The infant is otherwise clinically stable.
What is the most appropriate initial approach?
A. Increase the glucose infusion rate
B. Reduce the glucose infusion rate
C. Stop amino acids
D. Stop intravenous lipids
E. Replace glucose with normal saline
Correct Answer & Explanation:
Correct answer: B. Reduce the glucose infusion rate
Explanation: TPN in Neonates
First calculate the GIR:
10% glucose = 100 mg/mL
Thus, the infant is receiving 15 mg/kg/min of glucose.
Persistent hyperglycaemia at this glucose delivery should prompt review and reduction of the glucose infusion rate, while avoiding an abrupt cessation of glucose administration. TPN in neonates should provide glucose progressively according to the infant’s metabolic tolerance. NICE recommends a glucose intake of 9–16 g/kg/day for preterm and term neonates after the initial period, equivalent to approximately 6.25–11.1 mg/kg/min.
Why the other options are wrong
- A. Increase GIR: would worsen hyperglycaemia.
- C. Stop amino acids: protein provision is important for growth and is not the primary treatment for hyperglycaemia.
- D. Stop lipids: lipid restriction does not directly correct excessive glucose delivery.
- E. Replace glucose with saline: glucose remains an essential component of neonatal PN; complete withdrawal is inappropriate.
Exam pearl
10% glucose = 100 mg/mL
Therefore:
GIR = glucose concentration × infusion rate ÷ 60
In this case:
100 × 9 ÷ 60 = 15 mg/kg/min
High GIR + persistent hyperglycaemia → review/reduce glucose delivery and investigate other causes of hyperglycaemia.
Find high yield board exam MCQ on ABGs interpretation in a neonate.
External Resources
1. NICE — Neonatal parenteral nutrition (NG154)
Glucose intake recommendations, monitoring, and adjustment of neonatal PN. NICE recommends 9–16 g/kg/day as the maintenance range after the initial four days.
2. Turkish Neonatal and Pediatric Endocrinology and Diabetes Societies — Neonatal hyperglycemia consensus report
Discusses diagnostic thresholds and management, including reducing the glucose infusion rate and considering further treatment for persistent, significant hyperglycaemia.
3. NICE — Evidence review on glucose in neonatal parenteral nutrition
Reviews glucose requirements and the risks associated with hyperglycaemia in very preterm infants.
References:
1. National Institute for Health and Care Excellence. Neonatal parenteral nutrition. NICE guideline NG154. London: NICE; 2020. Available from: https://www.nice.org.uk/guidance/ng154
2. Çamurdan O, et al. Neonatal hyperglycemia, which threshold value, diagnostic approach and treatment?: Turkish Neonatal and Pediatric Endocrinology and Diabetes Societies consensus report. Turk Pediatri Ars. 2018;53(Suppl 1):S181–S192. Available from: https://pmc.ncbi.nlm.nih.gov/articles/PMC6568286/
3. National Guideline Alliance (UK). Glucose: Neonatal parenteral nutrition. Evidence review D1. London: National Institute for Health and Care Excellence; 2020. Available from: https://www.ncbi.nlm.nih.gov/books/NBK555672/
