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Anal function in geriatric patients with faecal incontinence.

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Faecal incontinence in the elderly is linked to internal anal sphincter dysfunction, not external sphincter weakness or pudendal nerve issues. Reduced anal resting pressure and impaired sensation are key indicators in geriatric patients experiencing incontinence.

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Area of Science:

  • Geriatric Medicine
  • Gastroenterology
  • Physiology

Background:

  • Faecal incontinence (FI) in the elderly is common but its underlying anal dysfunction is not well understood.
  • Existing knowledge associates FI with constipation and confusion, but detailed anal function analysis in geriatric populations is limited.

Purpose of the Study:

  • To investigate the anal function in faecally incontinent geriatric patients.
  • To compare anal pressures, sensation, and nerve function in incontinent elderly individuals against continent elderly individuals and young healthy controls.

Main Methods:

  • Anal manometry and sensory testing were performed on 99 geriatric patients (49 with FI, 19 with faecal impaction, 31 controls) and 57 young healthy controls.
  • Pudendal nerve terminal motor latency was measured to assess distal nerve function.

Main Results:

  • An age-related reduction in anal squeeze pressure was observed, but resting pressure was unaffected by age alone.
  • Faecally incontinent geriatric patients showed reduced anal resting pressure and impaired anal sensation compared to other groups.
  • Pudendal nerve terminal motor latency did not differ between groups, indicating no gross distal neuropathy.

Conclusions:

  • Internal anal sphincter dysfunction is a significant factor contributing to faecal incontinence in the elderly.
  • External anal sphincter weakness and distal pudendal neuropathy do not appear to be the primary causes of faecal incontinence in this population.