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Nocturia in adults: etiology and classification

J P Weiss1, J G Blaivas, D S Stember

  • 1New York Hospital/Cornell Medical Center, New York, USA. urojock@aol.com

Neurourology and Urodynamics
|October 17, 1998
PubMed
Summary

Nocturia, a common urologic symptom, can now be classified into nocturnal polyuria (NP) or nocturnal detrusor overactivity (NDO). Most patients have mixed NDO and NP, often unrelated to urologic conditions.

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Area of Science:

  • Urology
  • Gerontology
  • Nephrology

Background:

  • Nocturia is a prevalent and bothersome urologic symptom.
  • A clear classification system for nocturia is currently lacking.
  • Understanding the etiology is crucial for effective management.

Purpose of the Study:

  • To propose and validate a classification system for nocturia.
  • To identify the primary etiologies of nocturia in a patient cohort.
  • To determine the prevalence of different nocturia classifications.

Main Methods:

  • Retrospective review of 200 consecutive nocturia patients.
  • Evaluation included medical history, micturition diaries, postvoid residual urine (PVR), and videourodynamic studies (VUDS).
  • Functional bladder capacity (FBC) was determined, and nocturia was classified as nocturnal polyuria (NP), nocturnal detrusor overactivity (NDO), or mixed.

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Main Results:

  • Nocturnal detrusor overactivity (NDO) was the most common cause (57%), followed by mixed etiology (36%).
  • Nocturnal polyuria (NP) alone was less common (7%).
  • Polyuria (24-hr urine output >2,500 cc) was present in 23% of patients, often co-occurring with NDO.

Conclusions:

  • Nocturia is often multifactorial, with NDO and NP being significant contributors.
  • A substantial portion of nocturia cases are not directly related to underlying urologic conditions.
  • Treatment strategies should address both NP and NDO for optimal outcomes.