Instruments

Question 1

What is the indication for a peripheral venous cannula?

Answer 1

Peripheral administration of fluid and drugs

Question 2

What gauges are the different coloured cannulas?

Answer 2

14 = brown 
16 = grey 
18 = green 
20 = pink
22 = blue 
24 = yellow

Question 3

What is Poiseuille’s law?

Answer 3

Flow rate is proportional to r^4, and is inversely proportional to the length

Question 4

What are the complications of a cannula?

Answer 4

1. Haematoma
2. Malplacement
3. Blockage
4. Superficial thrombophlebitis