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Normal (A and B) and abnormal (C and D) MUPs recorded by needle electromyography (EMG) of the anal sphincter. A and B: 5 superimposed similar MUPs (bottom) and the average of these MUP (top). These MUP have the normal number of phases (i.e., 2 , left; 4, right) and are of normal duration (i.e., 3.4 ms, left; and 4.8 ms, right). C: MUP of short duration (1.4 ms) with 2 phases suggestive of muscle injury. D: prolonged (19.7 ms) polyphasic MUP (10 phases) suggestive of neurogenic injury.
