Immediately following neonatal cardiac surgery, which of the following is the best estimate of parenteral caloric requirements?

• A. 90-100 kcal/kg/day
• B. 120-170 kcal/kg/day
• C. 55-60 kcal/kg/day
• D. 100-110 kcal/kg/day

Answer: (A)

Immediately after neonatal cardiac surgery, the body is in a stressed, catabolic state and needs enough calories to support healing and growth without overloading the immature metabolism. Parenteral nutrition should provide a balance: enough energy to prevent muscle breakdown and support repair, but not so much carbohydrate and fat that hyperglycemia, hepatic fat accumulation, or increased CO2 production overwhelm the infant’s cardiopulmonary status. Targeting roughly ninety to one hundred kilocalories per kilogram per day achieves this balance in most neonates right after surgery. If nutrition is too low, catabolism and poor wound healing ensue; if it’s too high, glucose control worsens, triglycerides rise, and respiratory work can increase. As the infant stabilizes, caloric delivery can be adjusted upward in a monitored, progressive way.