# Fluid restriction is often required in the management of congestive heart failure (CHF). A typical..

Fluid restriction is often required in the management of

congestive heart failure (CHF). A typical fluid prescription is 30 mL/kg body

weight/day. Suppose that one of your older relatives suffers from CHF and asks

you to help figure out a days worth of beverages. (In this example, we will

ignore the water content of foods, although many dietitians include foods when

calculating the fluid intake of seriously ill patients.) Your relative weighs

168 lb and enjoys drinking milk, orange juice, and plain water. In order to

calculate how many fluid ounces are permitted each day, you will first

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Fluid restriction is often required in the management of

congestive heart failure (CHF). A typical fluid prescription is 30 mL/kg body

weight/day. Suppose that one of your older relatives suffers from CHF and asks

you to help figure out a days worth of beverages. (In this example, we will

ignore the water content of foods, although many dietitians include foods when

calculating the fluid intake of seriously ill patients.) Your relative weighs

168 lb and enjoys drinking milk, orange juice, and plain water. In order to

calculate how many fluid ounces are permitted each day, you will first need to

convert body weight from pounds to kilograms:

168 lb ÷ 2.2 lb/kg = 76.4 kg

Next, multiply the fluid allowance of 30 mL/kg by body

weight:

30 mL/kg × 76.4 kg = 2,292 mLFinally, convert mL to fluid

ounces. There are roughly 30 mL/fl. oz:

2,292 mL ÷ 30 mL/fl. oz = around 76 fl. Oz

Your relative could drink 12 fl. oz of milk, 8 fl. oz of

orange juice, and 56 fl. oz of water or other beverages. Here is a similar

problem for you to solve: a young woman is restricted to 25 mL/kg body

weight/day. She weighs 122 lb. How much total fluid (in fluid ounces) is she

allowed to drink each day?

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