Prescribing Flashcards
Normal urine output
0.5 mL/kg/hr
When prescribing fluids, what 3 factors have to be considered
- Basal requirements
- Existing deficit
- Predicted losses
Na daily requirement
1-2mmol/kg
K daily requirement
0.5-1 mmol/kg
Constituents of plasma
Na 135 - 147
Cl 92-109
K 3.5 -5
Ca 1.9-2.3
When are maintenance fluids given
if the patient isnt’ drinking enough. must match their daily requirements of Na, K and water over 24h
What is the amount of water required daily for a 70kg man
2000-2500 ml /day
way to calculate how much fluid is needed for weight
4 mmol / kg for the first 10 kilos
2 mml / kg for the second 10 kilos
1 mmol / kg for the third 10 kilos
Gives you ml / hr
x 24 to give a day
In resus how is fluid given
as a stat bolus
what fluids can be given for maintenance
0.9% saline
what fluids can be given for resus
0.9% saline
Hartmanns
Gelofusine/colloid
what fluids can be given for dehydration
5% glucose
contents of 0.9% saline
154 Na
154 Cl
contents of Hartmanns
131 Na
110 Cl
5 K
29 Lactate
Contents of 5% glucose
0 everything - pure water
