Ireton-Jones Energy Equations - IJEE
Determination of the Resting Energy Expenditure in
Hospitalized / Critically ill Patients
Background
Equations are listed below. The final selection of equations was
based on information found within the ADA evidence library and the
following reference:
Walker RN, Heuberger RA. Predictive Equations for Energy Needs for the
Critically Ill. Respir Care 2009;54(4):509:521.
Direct quotes: "Understanding an equations reference population and using the equation with
similar patients are essential for the equation to perform similarly. Prediction
accuracy among equations is rarely within 10% of the measured energy
expenditure; however, in the absence of indirect calorimetry, a prediction
equation is the best alternative."
"However, if an equation must be used, the 1998 and 2003 Penn State equations,
the 1992
Ireton-Jones equation, and the Swinamer equation are worthy of consideration."Important note: during the next update, additional
equations may be added. This initial version will only calculate results for the
Ireton-Jones equations.
Ireton-Jones Energy Equations - IJEE:
Age:
Gender:
Weight:
Select all that apply
Dieting - BMR - RMR
Calculators:
Several of these calculators may be particularly useful for dieters. Just
about every single MAJOR calorie/ energy equation that has been released
over the last 90 years is included below. Each calculator has a customized
printout option for easy analysis. Recommendation: Try each calculator -
print out the results - then compare!
Estimated 'Calorie' Calculators:
Harris-Benedict Equation:
Estimation of total calories needed. MOST widely used equation for calculating basal metabolic rate and total calories.
Revised Harris-Benedict Equation:The original Harris Benedict equation was revised in 1984. This updated equation can be used to calculate the basal metabolic rate and total calories.
RESTING Metabolic Rate (RMR):
Resting Metabolic Rate Calc - This equation can be used to calculate the RESTING metabolic rate and total calories. Mifflin-St Jeor equation.
Schofield equation (BMR)
:
This equation was part of the previous government guidelines to formulate RDA's and can be used to calculate the basal metabolic rate and total calories needed.
Institute of Medicine Equation- LATEST EQUATION:
IOM Equation-Estimated Energy Requirement (EER) Estimation of total calories needed. This equation is behind the 2005 Dietary Guidelines for Americans and the new food pyramid, MyPyramid.
Check out the new BMR multi-calc.
Background
Ireton-Jones Energy Equations IJEE:
Ventilator-dependent:
IJEE(v) = 1784 - 11(A)+ 5(W)+244 (G) + 239(T) + 804(B)
2002 version (revised
1997 equation).
IJEE(v) = 1925 - 10(A) + 5(W) +281 (G) +292 (T) +851 (B)
1992 version
Spontaneously Breathing:
IJEE(s) = 629 - 11 (A) + 25 (W) - 609 (O)
IJEE = kcal/day; A = age (yrs); W = actual wt(kg); G = gender(male=1, female=0);
T = trauma, B = burn, O=obesity( if present=1, absent=0)
No additional factor is added for activity or injury
Other
equations to consider
Harris Benedict Equations must be used with a custom stress factor:
BMR calculation for men (metric)
BMR = 66.47 + ( 13.75 x weight in kg ) + (
5.003 x height in cm ) - ( 6.755 x age in years )
BMR calculation for women (metric)
BMR = 655.1 + ( 9.563 x weight in kg ) + (
1.850 x height in cm ) - ( 4.676 x age in years )
Reference:
Harris JA, Benedict FG. A biometric study of human basal metabolism. Proc Natl
Acad Sci USA 1918;4(12):370-3.
Penn State Equations:
Penn State 1998 equation
(1.1 x value from Harris-Benedict equation - use ajbw if obese) + (140 x Tmax)+
(32 x VE) - 5340
Penn State 2003 equation
(0.85 x value from Harris-Benedict equation) + (175 x Tmax) + (33 x VE) - 6,433
Reference:
Frankenfield D, Smith S, Cooney RN. Validation of 2 approaches to predicting
resting metabolic rate in critically ill patients. JPEN J Parenter Enteral Nutr
2004;28(4):259-264.
Swinamer 1990 equation:
(945 x body surface area) - (6.4 x age) + (108 x temp in celsius) + (24.2 x
respiratory rate in breaths/min) + (817 x VT) - 4349
Reference:
Swinamer DL, Grace MG, Hamilton SM, Jones RL, Roberts P, King G. Predictive
equation for assessing energy expenditure in mechanically ventilated critically
ill patients. Crit Care Med 1990;18(6):657-661.
Reference
Ireton-Jones C, Jones JD. Improved equations for predicting energy expenditure
in patients: The Ireton-Jones equations. Nutr Clin Pract. 2002;17:29-31.
Ireton-Jones CA, Turner WW, Liepa GU, Baxter CR. Equations for
the estimation of energy expenditures in patients with burns with
special reference to ventilatory status. J Burn Care Rehabil 1992;
13(3):330-333. https://www.carolireton-jones.com/
