Paper I
2022 October (Supplementary) (2010 Scheme) · 40 marks · 120 min

Question

Adrenaline with lignocaine in local anaesthesia

Q91 marksShort Answers

Answer

Adrenaline is added to lignocaine for local anesthesia because its alpha-1-mediated vasoconstriction reduces blood flow at the injection site, which slows systemic absorption of lignocaine — this prolongs the duration of local anesthetic action, reduces peak plasma concentration (lowering systemic toxicity risk), and reduces local bleeding, improving the surgical field. It is avoided in end-arterial areas (fingers, toes, nose, ear, penis) due to the risk of ischemic necrosis from unopposed vasoconstriction.

Other Years Asked


Revise MBBS
Preview