Paper I
2019 July (Supplementary) (2010 Scheme) · 40 marks · 120 min

Question

Combination of adrenaline with lignocaine in infiltration local anesthesia

Q101 marksShort Answers

Answer

Adrenaline’s α1-mediated vasoconstriction reduces local blood flow at the injection site, which: (1) delays systemic absorption of lignocaine, prolonging its local duration of action, (2) reduces the risk of systemic toxicity by keeping peak plasma lignocaine concentrations lower, and (3) produces a relatively bloodless field, useful for minor surgical procedures. (Adrenaline must be avoided in end-artery regions — fingers, toes, nose, ears, penis — due to risk of ischaemic necrosis.)

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