Téma: 

The significance of manual correction in evaluation of uroflowmetry record

Marek Brezovský, Juraj Barta, Jozef Marko, Peter Weibl

Objective: The aim of our study was to evaluate the accuracy of Qmax determined by the computer compared to the Qmax generated by the computer using manual correction from the chart.
Material and methods: 184 uroflowmetric records have been retrospectively reviewed (Male/Female; 36 %/64 %). The average age was 55,3 years. Two computer generated Qmax parameters were monitored during each uroflowmetry - QmaxC and QmaxM (after manual correction). Other parameters that were monitored are: postvoided residual volume (V), the average flow (Qaver) and deviation of QmaxC from QmaxM. Student pair t-test was used for correlation of the average values of QmaxC and QmaxM. Percentage of deviation values was divided into 3 groups: above 5 %; 10 % and 20 % respectively. For each group the number of uroflowmetries with Qmax < 10ml/s; Qmax < 10 - 15 ml/s and Qmax > 15 ml/s was determined. 20 % was counted as the significant deviation.
Results: The average voided urine volume was 343 ml, QmaxC was 25,0 ml/s and QmaxM 22,7 ml/s. Student pair test confirmed the significant difference between Qmax generated by the computer and manually corrected values from the chart (p < 0,01). The number of uroflowmetries, where the deviation was > 5 % was 84/184. The proportion of uroflowmetries with Qmax < 10 ml/s was 7/84, with Qmax 10 - 15 ml/s - 16/84 and Qmax > 15 ml/s - 61/84. The number of different uroflowmetries was 72 with the established value of deviation > 10 %; from this subset (14/72 with Qmax < 10 ml/s, 5/72 w/Qmax 10 - 15 ml/s and 53/72 w/Qmax > 15 ml/s) respectively. The difference more than 20 % in Qmax value has been found in 36/184 of uroflowmetric records. The uroflowmetries with Qmax < 10 ml/s were recorded in 4/36; Qmax 10 - 15 ml/s - 6/36 and Qmax > 15 ml/s - 26/36.
Conclusion: Electronic versus manual evaluation was different in 19 % of cases. These differences are statistically significant and that is why the curves have to always be manually corrected.
Key words:uroflowmetry, atrefacts, maximum urinary flow rate

Ročník 2006  Témy časopisu Clinical urology 1 / 2006

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