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The after-contraction in paediatric urodynamics
P B Hoebeke1, J D Van Gool, E Van Laecke
1Department of Urology, University of Gent, Belgium.
Insights
After-contractions are common in children with bladder dysfunction and are linked to detrusor instability. This study confirms these events are genuine bladder muscle contractions.
Area of Science:
- Pediatric Urology
- Urodynamics
- Bladder Dysfunction
Background:
- Voiding dysfunction is a common issue in children.
- Urodynamic evaluation is crucial for diagnosing bladder problems.
- After-contractions during urodynamics require further investigation.
Purpose of the Study:
- To determine the frequency of after-contractions in children.
- To assess the clinical significance of after-contractions.
- To confirm the nature of after-contractions as detrusor activity.
Main Methods:
- Prospective study of 250 children with non-neurogenic voiding dysfunction.
- Video-urodynamic examination to identify after-contractions and filling-phase dysfunction.
- Detailed cystometry with multiple pressure transducers in a subset of children.
Main Results:
- After-contractions were observed in 84 of 250 children (33.6%).
- The majority of these children (80%) exhibited filling-phase dysfunction, including detrusor instability and hypersensitive bladder.
- Further urodynamic analysis confirmed after-contractions as genuine detrusor contractions.
Conclusions:
- After-contractions are a frequent finding in pediatric voiding dysfunction.
- The presence of after-contractions is associated with bladder instability.
- After-contractions represent true detrusor muscle activity.
Objective:
To evaluate the incidence and significance of the urodynamic registration of an after-contraction in the bladder of children.
Patients And Methods:
In a prospective study, 250 children with a non-neurogenic voiding dysfunction (132 girls and 118 boys) were assessed for the occurrence of after-contractions during their video-urodynamic examination, and any filling-phase dysfunction noted. Twenty children in whom an after-contraction was recorded underwent additional voiding cystometry with three pressure transducers in the bladder (two microtip and one external transducer connected to a fluid-filled catheter).
Results:
Of the 250 children, an after-contraction was registered in 84 (63 girls and 21 boys). Eighty of these had a filling-phase dysfunction; 51 had detrusor instability, 16 a hypersensitive bladder, six a low and seven a high compliance. Only four showed a normal cystometric pattern during filling. In the 20 children who underwent further study, the after-contraction was confirmed as a detrusor contraction, as it was registered simultaneously on three transducers of two types in 10 children and on two microtip transducers in another 10 children.
Conclusion:
The after-contraction is a frequent occurrence in children with voiding dysfunction, is related to bladder instability and is a genuine detrusor contraction.