Frankenfield et al reported equations for resting metabolic rate (RMR) of adults in the intensive care unit (ICU) in 1998 with revisions in 2003. The authors are from Pennsylvania State University.
Parameters:
(1) Harris-Benedict equation in kcal/day using adjusted body weight if obese
(2) Harris-Benedict equation in kcal/day without adjusting for obesity
(3) Mifflin St Jeor equation in kcal/day
(4) minute ventilation in liters per minute (from the ventilator)
(5) maximum body temperature in °C in the previous 24 hours
1998 Penn State equation for resting metabolic rate in kcal/day =
= (1.1 * (Harris-Benedict with weight adjustment)) + (32 * (minute ventilation)) + (140 * (maximum body temperature)) - 5340
2003 Penn State equation for resting metabolic rate in kcal/day =
= (0.85 * (Harris-Benedict using actual weight)) + (33 * (minute ventilation)) + (175 * (maximum body temperature)) - 6433
2003 Penn State equation for resting metabolic rate in kcal/day =
= (0.96 * (Mifflin)) + (31 * (minute ventilation)) + (167 * (maximum body temperature)) - 6212
where:
• For the 2003 equations current body weight was used if less than or equal to admission body weight. else admission body weight if current body weight higher (assumption that due to fluid accumulation).
