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Related Experiment Video

Updated: Feb 26, 2026

Detrusor Underactivity Model in Rats by Conus Medullaris Transection
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Pathophysiology of the Underactive Bladder: Evolving New Concepts.

Phillip P Smith1

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Summary

Underactive Bladder (UAB) is a voiding dysfunction concept. Defining UAB by symptoms, not detrusor underactivity, is key to understanding and treating this condition.

Keywords:
PathophysiologyUnderactive bladderVoiding dysfunction

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Area of Science:

  • Urology
  • Physiology

Background:

  • Underactive Bladder (UAB) is a poorly defined condition.
  • Confusing terminology hinders understanding of voiding dysfunction, patient experience, and pathophysiology.

Purpose of the Study:

  • To clarify the concept of Underactive Bladder (UAB).
  • To establish a framework for understanding UAB based on symptoms rather than solely urodynamic findings.

Main Methods:

  • Review of existing literature on voiding dysfunction and UAB.
  • Analysis of the relationship between patient-reported symptoms and urodynamic measurements.

Main Results:

  • The relationship between voiding symptoms and urodynamic dysfunction is variable.
  • Underactive Bladder (UAB), defined by symptoms, cannot be reliably linked to detrusor underactivity (DU) or detrusor weakness.
  • Current definitions of UAB are insufficient.

Conclusions:

  • Further progress requires characterizing functional disorders underlying UAB symptoms.
  • Investigating the biology of symptom-pathology linkages is crucial.
  • Re-conceptualizing urinary control within global adaptive physiology is necessary.
  • Understanding central and peripheral pathologies is key to addressing disrupted control mechanisms.