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Related Experiment Videos

Endosonographic variations in the normal internal anal sphincter.

S J Burnett1, C I Bartram

  • 1St. Mark's Hospital, London, UK.

International Journal of Colorectal Disease
|February 1, 1991
PubMed
Summary

Anal endosonography reveals age-related changes in the internal anal sphincter (IAS). Older individuals exhibit thicker and hyperechoic IAS, suggesting histological alterations with aging.

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Area of Science:

  • Gastroenterology
  • Medical Imaging
  • Anorectal Physiology

Background:

  • Anal endosonography is a key imaging modality for evaluating the internal anal sphincter (IAS).
  • Establishing normative data for IAS thickness and echogenicity is crucial for accurate interpretation.
  • Previous studies have not fully elucidated the relationship between IAS characteristics and demographic factors.

Purpose of the Study:

  • To determine the normal range for internal anal sphincter thickness and echogenicity using anal endosonography.
  • To investigate the correlation between IAS characteristics and physical parameters such as body weight, height, gender, and age.
  • To identify potential age-related histological changes in the internal anal sphincter.

Main Methods:

  • Anal endosonography was performed on 42 control subjects.
  • Measurements of internal anal sphincter thickness and echogenicity were recorded.
  • Statistical analyses were conducted to assess correlations with age, body weight, height, and gender.

Main Results:

  • No significant correlation was found between IAS thickness and body weight, height, or gender.
  • A significant positive correlation was observed between IAS thickness and age (p < 0.001).
  • IAS thickness ranged from 2.4-2.7 mm for individuals < 55 years and 2.8-3.4 mm for those > 55 years.
  • Hyperechogenicity of the IAS was significantly associated with age > 55 years (p < 0.01) and thickness > 2.8 mm (p < 0.05).

Conclusions:

  • Internal anal sphincter thickness and echogenicity are significantly influenced by age.
  • Age-related changes, including increased thickness and hyperechogenicity, suggest potential histological alterations in the IAS.
  • These findings provide valuable normative data and insights into the aging process of the internal anal sphincter.

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