<prompt> Shortest acting muscle relaxant -PancuroniumAtracuriumMivacuriumVecuronium  <response>: Ans. is c i.e., Mivacurium 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. 