Which of the following is not true about non-depolarizing muscle relaxant?: (A) Mg2+ predisposes the block, (B) Ca2+ antagonizes the block, (C) Metabolised by pseudocholinesterase, (D) Competitive inhibitor of acetylcholine
Answer is C. Among non-depolarizing blockers only mivacurium is metabolized by pseudocholinesterase. Block is potentiated by Mg2+ and Ca2+ increases the release of acetylcholine from nerve endings; thus paially antagonizes the block.