【Objectives】To evaluate the change of anorectal function in patients with rectal prolapsed by water perfusion anorec? tal manometry and pelvic floor electromyography.【Methods】A total of 60 patients with rectal prolapsed were enrolled in this study

the analgesic parameters included resting sphincter pressures

squeeze sphincter pressures

length of the anal canal and rectal sensa? tion

the results were compared with the parameters of normal population. Twenty of which completed pelvic floor electromyography ex? amination

analyzed the changes of pudendal nerve terminal movement latency (PNTML).【Results】The resting sphincter pressures

squeeze sphincter pressures of patients were lower than the normal population; The length of anal canal was shortened; The first sensa? tion and the first defecation threshold were higher than those of normal people

There was no significant change in the maximum tolera? ble threshold of rectum; pudendal nerve terminal movement latency extended more than 2.6 ms. 【Conclusions】Anal resting stool and function of contraction weakened in patients of rectal prolapse

decreased sensitivity of rectal

pudendal nerve terminal movement laten? cy extended.