Predictive Equations to Utilize

NoYes

Vented Non-vented

Obese: Use Ireton-Jones 1992 or Penn State 1998

Non-obese: Use Penn State 2003a; Swinamer; or Ireton-Jones 1992 (rated in order of accuracy)

Use Mifflin-St. Jeor

Is the patient critically ill?

Use Ireton-Jones 1992 spontaneous breathing equation

Mifflin-St. Jeor equation: REE (men) = 10 (wt in kg) + 6.25 (ht in cm) – 5 (age in yrs) + 5 REE (women) = 10 (wt in kg) + 6.25 (ht in cm) – 5 (age in yrs) -161

Use actual weight & an activity factor

Ireton-Jones (1992): IJEE (vent dependent): 1925 – 10(A) + 5(W) + 281(S) + 292(T) + 851(B) IJEE (spontaneous breathing): 629 – 11(A) + 25(W) – 609 (O) IJEE = estimated energy expenditure; A = age (years); T = trauma (present = 1, absent = 0); W = weight (kg); B = burns (present = 1, absent = 0); S = sex (male = 1, female = 0); O = BMI > 27 kg/m2 (present = 1, absent = 0)

Use actual weight & no activity or injury factors

Penn State (1998): REE = BEE(1.1) + VE (32) + Tmax(140) -5340 Penn State (2003a): REE = BEE(0.85) + VE (33) + Tmax(175) -6433 BEE = Harris Benedict equation; VE = minute ventilation (L/min); Tmax = maximum temp (in C) Harris Benedict (men): 66 + 13.8 (wt in kg) + 5 (ht in cm) – 6.8 (age in yrs) Harris Benedict (women): 655 + 9.6 (wt in kg) + 1.8 (ht in cm) – 4.7 (age in yrs)

Use actual weight unless BMI >30, then use IBW x 125%; no activity or injury factors