Question

6. Using the Harris-Benedict equations, calculate (a) the daily Calories required, (b) amount of protein, (c) amount of lipid (using a 10% lipid emulsion), and (d) amount of carbohydrates needed for a TPN for a 58- year-old woman who is 5ft 3in tall and weighs 152 lb, and is confined in the hospital due to a recent surgery producing mild stress to the patient.

Answer 1

a) Harris Benedict equations is method used to estimate individual BMR or Basal Metabolic Rate. The estimated BMR may be multiplied by a number that corresponds to individual activity level and the resulting number is the approximate daily kilocalories intake to maintain body weight.

BMR (women) = 655 + (4.35 × weight in pounds ) + (4.7 × height in inches) - (4.7× age in years)

BMR = 655 +( 4.35 × 152) + (4.7 × 63) - (4.7 ×58)

= 655 + 661.2 + 296.1 - 272.6

= 1339.7 cal

Calorie = BMR × 1.2 (since sedentary after surgery)

= 1339.7 × 1.2

= 1607.64 cal

b) Protein intake = weight / calorie in g/kg

= 152 / (1.6g/kg)

= 95 g of protein per day

c) amount of lipid =

1339 calories = 1339.7 × 0.3 = 401.9calories from fat

409 calories / (9 calories/g) = 45.4 g of fat per day

1 g fat = 9 calories