Lignocaine

Question 1

Pharmacology and presentation of Lignocaine?

Answer 1

50mg:5ml

• Local anaesthetic, that blocks the initiation and transmission of nerve impulses by blocking the movement of sodium ions across the nerve cell membrane.

Question 2

Indicators of Lignocaine?

Answer 2

• SC injection for prophylaxis of pain associated with IV cannulation.
• SC injection for digital ring blocks for analgesia.
• lO injection for bone pain associated with fluid infusion via an intraosseous needle.

Question 3

Contraindications of Lignocaine?

Answer 3

• Known severe allergy.
• Local infection in the area of injection.

Question 4

Cautions of Lignocaine?

Answer 4

• Taking an anticoagulant (ring blocks).

Question 5

Side Effects of Lignocaine?

Answer 5

• Stinging at the time of injection

Question 6

Dosing Regimes of Lignocaine?

Answer 6

SC For IV insertion Adult
- Maximum dose is 200mg, 20ml, inject SC at site of cannulation raise a bleb and wait 1min before cannulation

SC Paediatrics
- max of 3mg per kg

SC Digital Ring Block
- Administer 1-2ml of solution into the the tissue on either side of the web space of the digit

SC Doses may be repeated once after 30mins

IO Adult
- 50mg:5ml, administer over 1-2mins and wait 1 min before infusing fluid
- IO dose may be repeated once after 15mins

IO Paediatrics
- 1mg per kg, dose repeated once at 15mins

Question 7

Onset and duration of Lignocaine?

Answer 7

Onset:
- 1-2 mins for IV cannulation.
- 5-1O mins for digital ring blocks.

Duration
- 30-60mins