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Anal Sphincters Evaluation by Endoanal Ultrasound in Obstructed Defecation.

OBJECTIVES: To evaluate anal sphincter abnormalities detected by endoanal ultrasound in obstructed defecation due to rectocele and rectal intussusception.

METHODS: The retrospective analysis includes 45 patients with obstructed defecation syndrome due to rectocele and/or rectal intussusception with or without fecal incontinence, and submitted to endoanal ultrasound.

RESULTS: Ninety-three percent (n = 42) were women (mean age of 63 ± 12 years), and 47% (n = 21) of the patients had fecal incontinence. In total, 29% (n = 13) had a previous anorectal surgery, and 93% (n = 39) of the women had a previous vaginal delivery. An isolated rectal intussusception was diagnosed in 20% (n = 9) of the patients, an isolated rectocele in 24% (n = 11), and rectal intussusception and rectocele in 56% (n = 25). Thirty-six percent of patients had anal sphincter lacerations (n = 16): 12% (n = 2) had only internal laceration, 69% (n = 11) had only external laceration, and 19% (n = 3) had both. Two patients had a thinner internal anal sphincter with 0.9 and 1.2 mm, respectively. In total, 25% of the patients without fecal incontinence had an occult anal sphincter laceration, and all were women with an external sphincter laceration in the anterior quadrant and a previous vaginal delivery. In patients with obstructed defecation and fecal incontinence, 48% had sphincter lacerations. Previous anorectal surgery was a predictor of anal sphincter laceration (odds ratio [OR] 4.8; 95% confidence interval [CI] = 1.214-18.971; P = .025), but fecal incontinence (OR 2.7; 95% CI = 0.774-9.613; P = .119) and previous vaginal delivery (OR 1.250; 95% CI = 0.104-15.011; P = .860) were not.

CONCLUSIONS: Endoanal ultrasound should be considered in obstructed defecation with or without fecal incontinence, especially if surgical correction is planned.

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