<prompt> Train of four fade is a characteristic feature of:Depolarizing blockNon depolarizing blockBoth depolarizing and non-depolarizing blockMalignant hypehermia  <response>: Train of four fade is a characteristic of a non-depolarizing block. The Train-of-four stimulation denotes the administration of four successive 200-ps stimuli in 2 seconds 2 Hz and a series of patterns are produced and these patterns differ in a depolarizing block differs from that of a non-depolarizing block. In a non-depolarizing block there is progressive depression of height with each twitch fade and in a depolarizing block there is equal depression of all four twitches No fade. Ref: Clinical Anesthesiology By G. Edward Morgan, 4th Edition, Pages 152, 209 