Randomized trial comparing anorectal myectomy and controlled anal dilatation for outlet obstruction

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Abstract
A randomized controlled study has compared anorectal myectomy (n=13) with anal dilatation (n=10) using Park's anal retractor for patients with constipation. No patient was able to defaecate spontaneously more than three times a week before the operation. Of the 13 patients, 7 were able to defaecate spontaneously more than three times a week after anorectal myectomy, compared with none after anal dilatation (P2O, P2O, P2O, P2O, P<0·025). Patients having a good result after anorectal myectomy had a significantly shorter history of constipation (median, 4 (range, 2‐14) versus 38 (4‐72) years, P<0·01) and normal colonic transit (median, 100 (range, 4‐100) versus 10 (0‐90) years, P<0·05) compared with those who had no benefit after operation.