To evaluate the defaecation function after surgery, anorectal manometric studies with balloon method were performed on 89 patients with anorectal diseases and 70 patients who had undergone various kinds of sphincter-saving colorectal surgeries, compared with 46 healthy adults as control.
The results obtained are as follows.
1) "Slow wave", one type of anal pressure waves at the resting state, is supposed to be caused by denervation of the sympathetic nervous system.
2) Postoperative disturbances of defaecations are supposed to be caused not only by lowered anal sphincteric functions (anal pressure, rectoanal reflex) but also by lowered reservoir functions (rectal compliance, maximal tolerable volume, continuous relaxation volume).
3) The formula, f (the discriminant function)=0.035x+y-5.75, deviced by the author can clearly discriminate between the group of "good" or "fair" and that of "poor" following clinical assessment. Two variables x and y indicate resting anal pressure and rectal compliance, respectively, measured in the manometric studies. Hence, the author is confident that the cases of "f>0" can be judged as good or fair and those of "f <0" as poor.
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