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Urodynamics in normal infants and children
1Department of Pediatric Surgery, East Hospital, University of Göteborg, Sweden.
Insights
Urodynamic examination provides crucial insights into pediatric lower urinary tract function, aiding in diagnosing conditions like incontinence and neurogenic bladder. A calm environment is essential for accurate pediatric urodynamic testing.
Area of Science:
- Pediatric Urology
- Lower Urinary Tract Physiology
Background:
- Urodynamic examination is vital for assessing lower urinary tract function in children across various clinical scenarios.
- Normal development involves increasing detrusor inhibition and voluntary control over micturition by age five.
- Delayed or disturbed development can lead to long-term lower urinary tract dysfunction.
Purpose of the Study:
- To highlight the clinical utility of urodynamic examination in pediatric lower urinary tract dysfunction.
- To outline normal developmental patterns and age-dependent variables in pediatric urodynamics.
- To emphasize the importance of a child-friendly approach for reliable data acquisition.
Main Methods:
- Urodynamic studies were conducted in infants and children presenting with specific lower urinary tract symptoms.
- Age-specific normal values for bladder capacity and urinary flow were established.
- Factors influencing data reliability, such as patient anxiety, were considered.
Main Results:
- Established formulas for normal bladder capacity (ml = 30 + age in years x 30) and maximum urinary flow rate.
- Noted that intravesical pressure is generally lower in girls and younger children.
- Identified patient apprehension as a significant source of error in pediatric urodynamics.
Conclusions:
- Urodynamic examination is indispensable for diagnosing and managing pediatric lower urinary tract disorders.
- Understanding age-dependent urodynamic parameters is crucial for accurate interpretation.
- Creating a relaxed examination environment is paramount for obtaining reliable pediatric urodynamic data.
Abstract:
Urodynamic examination yields invaluable information about lower urinary tract function in infants and children in the following clinical situations: Daytime urinary incontinence, suspected infravesical obstruction, overt or suspected neurogenic bladder dysfunction, vesico-ureteral reflux with upper tract dilatation and chronic or recurrent bacteriuria. A normal development of lower urinary tract function during the first 5 years of life means that detrusor contractility will be successively more inhibited; furthermore, the child will become aware of bladder filling and will be able to postpone or initiate micturition. A disturbed or delayed development may well be the most important cause of dysfunctional states in the lower urinary tract later in life. Most urodynamic variables are age-dependent. Normal bladder capacity can be fairly well assessed by: Bladder capacity in ml = 30 + (age in years x 30). Normal maximum urinary flow during micturition (in ml/s) should approximately equal the square root of voided volume (in ml). The normal range (+/- 2SD) is given by the value thus obtained +/- 7 ml/s. Intravesical pressure is lower in girls than in boys, and lower in infants than in older children, but otherwise it does not vary with age. A tense and apprehensive child will not produce reliable urodynamic data. This is, no doubt, the most important source of error when examining children. It is strongly emphasized, therefore, that the examination has to be performed in a kind, understanding and relaxed atmosphere.