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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