When using REE from indirect calorimetry as caloric target in a critically ill patient, how should energy delivery be adjusted?

When using REE from indirect calorimetry as caloric target in a critically ill patient, how should energy delivery be adjusted?

• A. Reduced by 10% if respiratory quotient exceeds 1.0
• B. Increased by a stress factor of 1.2-1.5 for sepsis or trauma
• C. Adjusted by a thermogenesis factor for enterally fed patients
• D. Used as the caloric target without addition of stress or activity factors

Answer: (D)

Using the energy expended measured by indirect calorimetry as the caloric target means you set the daily calories to the REE value itself and do not apply any extra stress or activity multipliers. In critical illness, REE already reflects the patient’s current metabolic state, including the effects of stress, inflammation, and fever. Adding a stress or activity factor would double-count these needs and push calories toward overfeeding, which can increase CO2 production and complicate ventilation and recovery. If the REE indicates the patient’s energy needs, that target should be used directly. The thermic effect of feeding or substrate-driven adjustments aren’t added on top of REE when you’re following this approach, and factors suggested by RQ alone do not justify changing the REE target.

Using the energy expended measured by indirect calorimetry as the caloric target means you set the daily calories to the REE value itself and do not apply any extra stress or activity multipliers. In critical illness, REE already reflects the patient’s current metabolic state, including the effects of stress, inflammation, and fever. Adding a stress or activity factor would double-count these needs and push calories toward overfeeding, which can increase CO2 production and complicate ventilation and recovery. If the REE indicates the patient’s energy needs, that target should be used directly. The thermic effect of feeding or substrate-driven adjustments aren’t added on top of REE when you’re following this approach, and factors suggested by RQ alone do not justify changing the REE target.