Key Physiological Numbers

Question 1

Expected urine output

Answer 1

> 0.5mL/kg/hour

So a 70kg pt should produce at least 35mL per hour, or 840mL per day.

Question 2

Fluid maintenance volume requirements.

Answer 2

25-30mL / kg / day

So a 70kg pt should require approximately 2100mL fluid per day

Question 3

Sodium, potassium, and chloride requirements per day

Answer 3

K: 1mmol/kg/day
NaCl: 1mmol/kg/day

Question 4

Glucose requirements per day

Answer 4

50-100g glucose per day to limit starvation ketosis.

Question 5

Fluid requirements for children, per kg.

Answer 5

4:2:1 rule

4mL per kg per hour for first 10kg
2mL per kg per hour for second 10kg
1mL per kg per hour for further kg