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Related Experiment Videos

Haemorrhoids: pathology, pathophysiology and aetiology

P B Loder1, M A Kamm, R J Nicholls

  • 1St Mark's Hospital, London, UK.

The British Journal of Surgery
|July 1, 1994
PubMed
Summary

Haemorrhoidal disease occurs when anal cushions, which help with continence, shift out of place. While many blame bowel habits like constipation, evidence does not strongly support this. A key finding is increased resting anal pressure, but this is likely a result of the disease rather than a cause. The role of certain muscles and potential treatments using drugs remain unclear. This review highlights the need for more research into these areas to better understand and treat haemorrhoidal disease.

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Area of Science:

  • Gastroenterology
  • Colorectal Surgery
  • Physiological Medicine

Background:

Haemorrhoidal disease remains poorly understood despite its clinical prevalence. While anal cushions are known to support continence, their displacement leads to disease. Blaming constipation or bowel habits lacks strong evidence. A key finding is elevated resting anal pressure, but its role is unclear. Researchers have not yet determined if this pressure is a cause or a consequence. The longitudinal muscle's role in the condition remains unexplored. Subepithelial muscle pharmacology is also unstudied. These gaps limit treatment development.

Purpose Of The Study:

This review aims to clarify the mechanisms behind haemorrhoidal disease. It focuses on the displacement of anal cushions and their physiological consequences. The study highlights the lack of evidence linking bowel habits to disease. It investigates elevated anal pressure as a potential secondary effect. The purpose includes identifying unexplored areas like muscle function. Researchers also aim to assess pharmacological responses in anal tissues. The review seeks to guide future investigations into treatment options. It emphasizes the need for targeted physiological studies.

Keywords:
Haemorrhoidal diseaseAnal cushionsContinenceResting anal pressure

Frequently Asked Questions

The primary mechanism is the distal displacement of anal cushions, which are normal structures involved in continence.

No, despite common belief, constipation is not strongly linked to haemorrhoidal disease according to the review.

The review suggests that elevated resting anal pressure likely results from disease rather than being a cause.

The function of the longitudinal muscle in relation to haemorrhoidal disease remains unexplored and is an area for future research.

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Main Methods:

The review synthesizes existing literature on haemorrhoidal disease pathology. It examines the role of anal cushions in continence and their displacement. The authors analyze evidence regarding bowel habits and disease causation. They assess physiological data on resting anal pressure. The review includes studies on longitudinal muscle function. It also considers subepithelial muscle pharmacology. Researchers evaluate the clinical potential of pharmacological agents. The approach combines clinical and physiological findings.

Main Results:

The primary finding is that anal cushion displacement causes haemorrhoidal disease. Bowel habits are not strongly linked to disease onset. Elevated resting anal pressure is a consistent physiological abnormality. However, this pressure likely results from disease rather than causes it. The longitudinal muscle's role remains unclear. Subepithelial muscle pharmacology is understudied. Specific pharmacological agents may reverse observed changes. These findings suggest new research directions for treatment development.

Conclusions:

The authors conclude that haemorrhoidal disease stems from anal cushion displacement. Bowel habits are not primary causes, despite common assumptions. Elevated resting anal pressure is a secondary effect. The role of longitudinal and subepithelial muscles requires further study. Pharmacological agents may offer therapeutic potential. The review highlights gaps in understanding disease mechanisms. Future research should focus on muscle function and drug responsiveness. These conclusions emphasize the need for targeted physiological investigations.

The review proposes that specific pharmacological agents may reverse observed physiological changes in haemorrhoidal disease.

The pharmacological responsiveness of the anal subepithelial muscle is understudied and may offer new treatment insights.