|For each kilogram in this range||Daily caloric cost per kilogram|
|1-10 kg||100 kcal/kg/day|
|11-20 kg||50 kcal/kg/day|
|>20 kg||20 kcal/kg/day|
For every 100 kcal expended, a certain amount of fluid is lost either
through "insensible water loss" or through renal function; a small amount
is generated through oxidation of carbohydrates and tissue catabolism.
Also, for every 100 kcal expended, electrolytes are lost in the following
|Na||3 mEq per 100 kcal/day|
|K||2 mEq per 100 kcal/day|
|Cl||2 mEq per 100 kcal/day|
Example: Calculate the daily fluid requirements of a 10 year old
boy who weighs 32 kg using the Holiday-Segar method:
|Kcal expended||10*100 + 10*50 + 12*20||1740 kcal|
|H20 required||1740 kcal * 100 cc/100 kcal||1740 mL H2O|
|Na required||1740 kcal * 3 mEq/100 kcal||52.2 mEq Na|
|K required||1740 kcal * 2 mEq/100 kcal||34.8 mEq K|
|Cl required||1740 kcal * 2 mEq/100kcal||34.8 mEq Cl|
Given good renal function and no overriding concerns about excess sodium, a maintenance fluid to provide at least the required amount of sodium. Potassium is usually added after the patient's first void in an amount that will yield the above maintenance level. Chloride is usually not a concern in and of itself, but is a passive ion. A table of common solutions can be consulted to pick an appropriate solution.
In this case, the target solution should have 52.2 mEq Na per 1.74 liters,
or 30 mEq Na per liter. The closest solution is the 34.2 mEq/L found
in 0.2% saline. Each liter should also contain 20 mEq of potassium.
The Holiday-Segar can be used to quickly estimate fluid requirements in terms of mL/hour (a useful way of expressing it, since this is how IV infusion pumps are programmed):
|For each Kilogram in the Range||Add to Daily Requirement||Add to Hourly Requirement|
|0-10 kg||100 mL||4 mL (~ 100/24 hours)|
|11-20 kg||50 mL||2 mL|
|>20 kg||20 mL||1 mL|
Thus, for a 45 kg girl, the maintenance IV fluid rate would be 4*10
+ 2*10 + 35*1 = 95 mL/hour.
|Net Scut Home|