Contraindications to vasoconstrictors in local anaesthesia – Anaesthesia MCQ

Contraindications to vasoconstrictors in local anaesthesia?

A. Spinal anaesthesia
B. Epidural anaesthesia
C. Digital nerve block
D. Regional anaesthesia

Correct answer : C. Digital nerve block

Contraindications to vasoconstrictors in local anaesthesia

Vasoconstrictors like adrenaline are used with local anaesthetics for decreasing the systemic absorption and to increase the local anaesthetic concentration and duration of nerve block
But adrenaline should not be used with lignocaine when infiltrating areas of end arterial supply
These sites include:
- Fingers
- Toes
- Pinna
- Penis
- Nose
The use of adrenaline is these areas can compromise the blood flow and result in ischaemic injury

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