<prompt> Muscle relaxant used in renal failureKetamineAtracuriumPancuroniumFentanyl  <response>: The unique feature of atracurium is inactivation in plasma by spontaneous nonenzymatic degradation Hofmann elimination in addition to that by Alkaline ester hydrolysis.Consequently, its duration of action is not altered in patients with hepaticrenal insufficiency or hemodynamic compromise It is the preferred muscle relaxant for such patients as well as for neonates and elderly. 