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Related Experiment Videos

What is the variability between 2 consecutive cystometries in the same child?

L Chin-Peuckert1, M Komlos, J E Rennick

  • 1Department of Urology, Pediatric Urology Section, University of Texas Southwestern Medical Center and Children's Hospital Medical Center of Dallas, 75235, USA.

The Journal of Urology
|September 23, 2003
PubMed
Summary

Repeat cystometry in children shows no significant differences in bladder capacity or pressure-flow parameters. However, uninhibited detrusor contractions (UICs) are more frequent in the initial cystometrogram (CMG), suggesting the second CMG is more reliable for clinical interpretation.

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Area of Science:

  • Pediatric Urology
  • Urodynamics
  • Pediatric Nephrology

Background:

  • Cystometrograms (CMGs) are essential for evaluating lower urinary tract function in children.
  • Understanding variability between consecutive CMGs is crucial for accurate diagnosis and management.
  • Previous studies have not fully elucidated the reliability of repeat CMGs within the same session.

Purpose of the Study:

  • To determine the variability between two consecutive cystometrograms (CMGs) performed in the same child during a single session.
  • To compare key urodynamic parameters, including bladder capacity and pressure-flow characteristics.
  • To assess the frequency and significance of uninhibited detrusor contractions (UICs) between the two studies.

Main Methods:

  • Two consecutive CMGs were performed on pediatric subjects with identical filling rates and positioning.

Related Experiment Videos

  • Parameters compared included maximum cystometric bladder capacity (CBC), pressure at CBC, leak point pressure, and pressure-specific volumes (PSVs).
  • Uninhibited detrusor contractions (UICs) were analyzed using both previous and current International Children's Continence Society definitions.

    • Main Results:

    • No significant differences were observed in maximum CBC, pressure at CBC, leak point pressure, maximum flow rate, pressure at maximum flow, maximum voiding pressure, or residual urine between the two CMGs.
    • Pressure-specific volumes (PSVs) demonstrated high correlation between consecutive studies, indicating good reproducibility.
    • Uninhibited detrusor contractions (UICs) were more frequent during the first CMG compared to the second (p = 0.02 and 0.03), with a lower threshold volume.

    Conclusions:

    • Consecutive CMGs in the same child show no significant differences in CBC, PSV, and pressure-flow parameters.
    • UICs occur more frequently in the initial CMG, suggesting potential learning effects or adaptation.
    • Repeat cystometry is not indicated if the first CMG shows no UICs; the second consecutive CMG is recommended for clinical interpretation.