Most cardiotoxic local anaesthetic is:: (A) Procaine, (B) Bupivacaine, (C) Prilocaine, (D) Tetracaine
Answer is B. - Bupivacaine is most cardiotoxic local anaesthetic - so, it is contra-indicated in intravenous regional anaesthesia (Bier's block) =Prilocaine caused methmoglobinemia