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Urinary flow studies in normal kindergarten--and schoolchildren
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Urinary flow rate (Qmax) measurement is a suitable screening tool for children with suspected infravesical obstruction. This study established normal values for pediatric uroflowmetry in a natural environment.
Area of Science:
- Pediatric Urology
- Diagnostic Procedures
- Medical Screening
Background:
- Infravesical obstruction in children poses diagnostic challenges.
- Existing normal uroflowmetry data has limitations.
- Need for reliable screening methods in pediatric populations.
Purpose of the Study:
- To establish normal uroflowmetry parameters in children.
- To evaluate the suitability of Qmax as a screening tool.
- To define normative data for pediatric voiding parameters.
Main Methods:
- Investigated spontaneous urination in 205 normal children (3-13 years).
- Utilized a mictiograph in naturalistic settings (kindergartens, school).
- Calculated uroflowmetry parameters (Q1 sec, Qmax, Qmax time, micturition time) relative to voided volume; non-parametric statistical analysis.
Main Results:
- Defined normal value limits (2.5% and 97.5% percentiles) for pediatric uroflowmetry parameters.
- Established age and sex-specific reference ranges.
- Identified that 90% of pediatric flow curves resemble adult patterns.
Conclusions:
- Isolated urinary flow rate (Qmax) measurement is an effective screening procedure for suspected infravesical obstruction.
- The established normative data provides a reliable basis for pediatric uroflowmetry interpretation.
- Pediatric voiding patterns are largely consistent with adult patterns.
Abstract:
The problems in the evaluation of children with suspected infravesical obstruction are shortly reviewed. Based upon literature studies it is concluded, that an isolated urinary flow measurement determining the Qmax is a suitable procedure of screening. Due to different shortcomings of earlier published normal materials, we investigated the spontaneous urination of 205 normal children aged 3 to 13 years in their normal environment. The mictiograph was installed in the toilet of two kindergartens and one school, enabling the children freely to void into the machine upon desire. From the flow curves the following parameters were calculated: Q1 sec, Qmax, Qmax time, and the micturition time, all of them being related to the square root of the voided volume. The data were non-parametrically statistically processed, and the limits of normal values (2 1/2% and 97 1/2% percentiles) are defined for different groups of age and sex. Furthermore, the different flow curve patterns are described, and it is found, that in 90% of the cases they are identical to the adult pattern.