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Diagnosis and grading of detrusor instability using a computerized algorithm

J Groen1, A J Klijn, J L Bosch

  • 1Department of Urology (Urodynamics), Erasmus University Rotterdam, The Netherlands.

The Journal of Urology
|April 29, 1998
PubMed
Summary
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A new method quantifies detrusor instability using the area under involuntary detrusor contractions during cystometry. This objective approach provides a single value for grading bladder instability, differing from expert assessments.

Area of Science:

  • Urology
  • Urodynamics

Background:

  • Detrusor instability involves involuntary contractions during bladder filling.
  • Urodynamic evaluation diagnoses detrusor instability.
  • Quantifying instability is crucial for patient comparison and treatment evaluation.

Purpose of the Study:

  • Develop an objective method to quantify detrusor instability.
  • Create an instability parameter based on the area under the curve of involuntary detrusor contractions during cystometry.

Main Methods:

  • An automatic method was developed to calculate the area under the curve of involuntary detrusor contractions.
  • Logistic regression created decision rules to distinguish stable from unstable bladders.
  • The method was validated on two groups of children (100 and 77).

Related Experiment Videos

Main Results:

  • The automatic procedure correctly classified 88% of the second group.
  • Poor correlation was found between the calculated parameter and expert scores in unstable cases.
  • Experts' intuitive scoring relied on contraction amplitude and duration.

Conclusions:

  • The proposed automatic grading method differs from expert intuition.
  • The study cannot definitively state which method is superior due to lack of a standard.
  • The developed method offers an objective, single-value measure for detrusor instability.