ArticleTechniques in coloproctology2020
Rheology of human faeces and pathophysiology of defaecation.
Article in Techniques in coloproctology, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
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8 citing papers in PubMed, 11 citations in OpenAlex.
- Emergent spatial structure in the gut microbiota is driven by bacterial growth and gut contractions.PLoS biology · 2026Article
- New Insights into a Conceptual Bionic Colonic Bioreactor: A Model, 'Probiotics in Human Colon', Showing How Probiotics Alleviate Constipation from a Bioprocess Engineering Perspective.Foods (Basel, Switzerland) · 2025Review
- Influence of the examination position and distension medium on the rectal sensory test in patients with functional constipation.BMC gastroenterology · 2024Article
- Flow simulations of rectal evacuation: towards a quantitative evaluation from video defaecography.Interface focus · 2022Article
- Understanding the physiology of human defaecation and disorders of continence and evacuation.Nature reviews. Gastroenterology & hepatology · 2021Review
- Magnetically-propelled fecal surrogates for modeling the impact of solid-induced shear forces on primary colonic epithelial cells.Biomaterials · 2021Article
- The virtual physiological human gets nerves! How to account for the action of the nervous system in multiphysics simulations of human organs.Journal of the Royal Society, Interface · 2021Article
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Authors and funding
6 authors at 5 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundRectal evacuation involves multiple mechanisms that are not completely understood. The aim of this study was to quantify the rheologic property, i.e., yield stress, which governs the ease of deformation of a range of faeces of differing consistency and understand its influence on the pathophysiology of defaecation.
methodsYield stresses of faeces of differing consistencies and Bristol scores were determined by the Vane test. We then explored the effects of this property on ease of defecation using a simple static model of the recto-anal junction based on the laws of flow for yield stress pastes and checked the conclusions by X-ray defaecography experience.
resultsThe yield stress of faeces increased exponentially with their solid content, from 20 to 8000 Pa. The static model of the recto-anal junction showed that evacuation of faeces of normal consistency and yield stress is possible with moderate dilatation of the anal canal, whilst the evacuation of faeces with higher yield stress requires greater dilatation of the anal canal. X-ray defaecography showed that such increases occurred in vivo.
conclusionsThe diameter of the recto-anal junction is increased to enable the passage of feces with high yield stress. The finite limits to such dilation likely contribute to fecal impaction. Hence, difficulties in defaecation may result either from unduly high yield stress or pathologies of reflex recto-anal dilatation or a combination of the two.
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