In dietary management for mechanically ventilated patients, which nutrient is minimized?

In dietary management for mechanically ventilated patients, which nutrient is minimized?

• A. Carbohydrates
• B. Protein
• C. Fat
• D. Vitamins

Answer: (A)

The key idea is that the amount of CO2 produced during metabolism depends on which macronutrient is used for energy. Carbohydrates yield more CO2 per unit of energy than fats or proteins (their respiratory quotient is highest). In patients on mechanical ventilation, minimizing CO2 production helps the ventilator work less hard and can aid weaning. Therefore, dietary plans often shift energy toward fats, with reduced carbohydrate intake, to lower overall CO2 generation. Vitamins aren’t energy sources and aren’t minimized; they’re needed for metabolism, while protein and fat are kept adequate to meet nitrogen balance and energy needs.

The key idea is that the amount of CO2 produced during metabolism depends on which macronutrient is used for energy. Carbohydrates yield more CO2 per unit of energy than fats or proteins (their respiratory quotient is highest). In patients on mechanical ventilation, minimizing CO2 production helps the ventilator work less hard and can aid weaning. Therefore, dietary plans often shift energy toward fats, with reduced carbohydrate intake, to lower overall CO2 generation. Vitamins aren’t energy sources and aren’t minimized; they’re needed for metabolism, while protein and fat are kept adequate to meet nitrogen balance and energy needs.