Phenotypic variation in functional disorders of defecation

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Abstract

Background & Aims: Although obstructed defecation is generally attributed to pelvic floor dyssynergia, clinical observations suggest a wider spectrum of anorectal disturbances. Our aim was to characterize phenotypic variability in constipated patients by anorectal assessments. Methods: Anal pressures, rectal balloon expulsion, rectal sensation, and pelvic floor structure (by endoanal magnetic resonance imaging) and motion (by dynamic magnetic resonance imaging) were assessed in 52 constipated women and 41 age-matched asymptomatic women. Phenotypes were characterized in patients by principal components analysis of these measurements. Results: Among patients, 16 had a hypertensive anal sphincter, 41 had an abnormal rectal balloon expulsion test, and 20 had abnormal rectal sensation. Forty-nine patients (94%) had abnormal pelvic floor motion during evacuation and/or squeeze. After correcting for age and body mass index, 3 principal components explained 71% of variance between patients. These factors were weighted most strongly by perineal descent during evacuation (factor 1), anorectal location at rest (factor 2), and anal resting pressure (factor 3). Factors 1 and 3 discriminated between controls and patients. Compared with patients with normal (n = 23) or reduced (n = 18) perineal descent, patients with increased (n = 11) descent were more likely (P ≤. 01) to be obese, have an anal resting pressure >90 mm Hg, and have a normal rectal balloon expulsion test result. Conclusions: These observations demonstrate that functional defecation disorders comprise a heterogeneous entity that can be subcharacterized by perineal descent during defecation, perineal location at rest, and anal resting pressure. Further studies are needed to ascertain if the phenotypes reflect differences in the natural history of these disorders.

Original languageEnglish (US)
Pages (from-to)1199-1210
Number of pages12
JournalGastroenterology
Volume128
Issue number5
DOIs
StatePublished - May 2005

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Defecation
Pelvic Floor
Pressure
Magnetic Resonance Imaging
Phenotype
Anal Canal
Ataxia
Principal Component Analysis
Natural History
Body Mass Index

ASJC Scopus subject areas

  • Gastroenterology

Cite this

Phenotypic variation in functional disorders of defecation. / Bharucha, Adil Eddie; Fletcher, Joel Garland; Seide, Barb; Riederer, Stephen J; Zinsmeister, Alan R.

In: Gastroenterology, Vol. 128, No. 5, 05.2005, p. 1199-1210.

Research output: Contribution to journalArticle

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