<prompt> Shoest acting muscle relaxantPancuroniumAtracuriumMivacuriumVecuronium  <response>: MivacuriumMivacurium is the shoest acting competitive blockersIt does not need reversal -can be used as an alternative to SCh for endotracheal intubationIt is metabolized rapidly by plasma cholinesterases -prolonged paralysis can occur in pseudocholinesterase deficiency Mivacurium is the only nondepolarising competitive blocker that is metabolized by plasma cholinesterase pseudocholinesterase.Refer: stoeltings pharmacology and physiology in anaesthetic practice, 5th edition, pg no.328 