Subject of the report are urodynamic investigations in 122 children with a normal urinary tract and in 168 children with disturbances of the subvesical outflow. The children were divided into four groups corresponding to age and sex. Measuring methods were uroflowmetry and cystometry. The latter was performed with small urethral plastic catheters 1,5 mm in diameter. In comparison with the investigations without catheter our measured values show a revoked or distinctly decreased dependence of the maximal urinary flow on the micturition volume. This behaviour can be explained by an approximately maximal widening of the subvesical outflow tract due to the obstructive effect of the catheter. The pressure/flow relations confirm this behaviour. They correspond to those of a rigid tube with individual constant diameter. This condition permits a good comparison between the measured values and an accurate separation between normal and pathologic cases. Normal ranges of the pressure/flow relations at the moment of maximal flow were calculated and presented by diagrams. Pathologic micturitions can be differentiated and classified by such diagrams. Among the various urodynamic methods the uroflowmetry has a good diagnostic value in boys. With the urethral resistance relation PQmax/Qmax2 a subvesical obstruction may be recognized in both sexes. A better assessment of the functional obstructive effect with regard to compensation and decompensation is only possible with the demonstrated pressure/flow diagrams.

Keywords:
Urodynamic investigations, Micturition in children, Pressure/flow diagrams, Subvesical obstructions, Diagnostic value
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© 1981 S. Karger AG, Basel
1981
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