This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Non-depolarising Neuromuscular Blocking Agents, Subject name: Anaesthesia
Shortest acting nondepolarising muscle relaxant- 
Select and explain. 
A. Succinylcholine, B. Mivacurium, C. Atracurium, D. Vecuronium
B: Mivacurium
Answer: B: Mivacurium 
Explanation: Ans. is 'b' i.e., Mivacurium o Suxamethonium (succinylcholine) is the shortest acting skeletal muscle relaxant.o Mivacurium is the shortest acting nondepolarizing skeletal muscle relaxant.Mivacuriumo Mivacurium is the shortest acting competitive blockers.o It does not need reversal - can be used as an alternative to SCh for endotracheal intubation.o It is metabolized rapidly by plasma cholinesterases - prolonged paralysis can occur in pseudocholinesterase deficiency.o Mivacurium is the only nondepolarising (competitive) blocker that is metabolized by plasma cholinesterase (pseudocholinesteres).