<prompt> Shortest acting nondepolarising muscle relaxant-SuccinylcholineMivacuriumAtracuriumVecuronium  <response>: 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. 