The role of sodium bisulphate in a L.A solution is:: (A) Reducing agent, (B) Aesthetic agent, (C) Vasoconstrictor, (D) Preservative
Answer is A. Reducing agent (Ref: Malamed-4th Ed/Pg 274) Contents of LA caridge: Ingredient Function Local anesthetic agent (Lignocaine) Conduction blockade Vasoconstrictor (adrenalin) |es absorption of LA anesthesia & toxicity Sodium sulphide Antioxidant for vasoconstriction Methyl paraben Preservative Sodium chloride Isotonicity of solution Sterile water Diluent