6 - 10 SBAs on Ophthalmic Anaesthesia
Question 6
What is the onset time for Lidocaine 2% used in ophthalmic anaesthesia?
- 1 minute
- 3 minutes
- 5 minutes
- 10 minutes
- 15 minutes
Answer
- 3 minutes
Lidocaine 2% is the standard anaesthetic used for short ophthalmic procedures
- Onset time 3 minutes
- Duration 1 hour
- Often mixed 50:50 with levobupivacaine to provide a longer duration of action
- 3-5ml used for Sub-Tenon's block
- 6-10ml for Peribulbar block