A randomized controlled trial of anorectal biofeedback for constipation

Stacey L. Hart, Janet Waimin Lee, Julia Berian, Taryn R. Patterson, Amanda Del Rosario, Madhulika G. Varma

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

Purpose The purposes of this study were: (1) to examine the efficacy of anorectal biofeedback (AB) for constipation compared to a biofeedback control (BC) treatment and (2) to examine the extent to which self-reported childhood sexual/physical abuse predicted biofeedback outcome. Methods Twenty-one patients with pelvic floor dyssynergia were randomized to either (1) an AB arm, where patients learned to isolate the anal sphincter using an electromyog-raphy probe, or (2) a BC arm that controlled for the nonspecific effects of biofeedback, where patients learned to relax trapezius or temporalis muscles with EMG feedback. Both treatments were delivered by registered nurses for six sessions. Prior to randomization and post-treatment, patients completed the validated Constipation Severity Instrument and two measures of quality of life (QOL), the Irritable Bowel Syndrome-QOL, and the SF-36. Generalized estimating equations examined the within-group and between-group differences over time. Results Pre- and post-treatment data were obtained for six AB and nine BC patients. AB patients' overall constipation severity scores decreased by 35.5% (vs. 15.3%), and their obstructive defecation symptom scores decreased by 37.9% (vs. 19.7%) compared to BC. A similar pattern was shown on the IBS-QOL. On the SF-36 Mental Health Composite (MCS), AB scores improved 28.0% compared to BC scores, which worsened 12.7%. Those without (vs. with) a childhood sexual/physical abuse history showed improvement on the MCS post-biofeedback. Conclusions While our sample was statistically underpowered, AB produced clinical improvements in constipation severity and QOL.

Original languageEnglish (US)
Pages (from-to)459-466
Number of pages8
JournalInternational Journal of Colorectal Disease
Volume27
Issue number4
DOIs
StatePublished - Apr 1 2012

Keywords

  • Anorectal biofeedback
  • Clinical trial
  • Constipation
  • Quality of life

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