Calculations Flashcards
1
Q
Correction of Na for High Glucose
A
Every 100 mg extra glucose above 100 = dec Na by 3
2
Q
Maintenance Fluids
A
4-2-1
4mL/kg - first 10 kg
2 mL/kg - next 10 kg
1 mL/kg - every kg above 20 kg
3
Q
What is adequate urine output in an adult?
A
.5 - 1 mL/kg/hr
4
Q
Free Water Deficit
A
TBW x (1 - actual Na/ desired Na)
5
Q
Anion Gap
A
Na - (bicarb + Cl)
Normal = 12 +/- 2
6
Q
Winter’s Formula
A
Expected PaCO2 = 1.5 (bicarb) + 8 +/- 2
7
Q
Delta Gap
A
Calc AG - 12 = # new anions
24 - # new anions = delta gap
If bicarb < delta gap then also metabolic acidosis (not enough bicarbs to buffer then new anions)
If bicarb > delta gap then also metabolic alkalosis (more bicarbs then needed to buffer)
8
Q
Fe Na
A
Una x Scr / Sna x Ucr
< 1% associated with pre-renal v. 2-3% associated with intrinsic
