Moderated Posters Session 2

3:05 PM - 3:50 PM

Comparison of the pressure flow studies using water filled and air charged catheters system for male patients

Professor Hirotaka Asakura (1), Minami Ohmura (1), Takashi Asakura (1), Taiki Hayashi (1), Youko Nakahira (1), Toshiaki Shinojima (1), Hitoshi Yanaihara (1)

(1) Saimtama Medical University Hospital, Moroyama-machi, Iruma-gun, Japan


we investigated to compare the data of pressure flow study using WFC and ACC system and examine the agreement for the gradings of obstruction and detrusor contractility on the basis of BOOI/BCI and Schäfer nomogram.


For this study the male patients who underwent consecutive pair of pressure flow study (WFC and ACC systems) were selected from UDS data base between 2017 and 2018.The grading of BOO and detrusor contractility in both catheter systems were evaluated using BOOI & BCI and Schäfer nomogram. The agreements of Qmax and PdetQmax were assessed using the Bland and Altman analysis. Cohen’s kappa coefficient was used for the agreements of grading of BOO and bladder contractility between them.


Twenty-five male patients were selected. The average age was 74.2±5.8 years old. Applying the Bland and Altman method, the values of Qmax are similar (mean differences 0.3ml/s), however, the values of PdetQmax in the WFC systems are higher than that in the ACC (mean differences 4.6cmH2O) (Fig1). Cohen’s kappa for obstruction and detrusor contractility estimated using BOOI and BCI were 0.802 and 0.696 respectively. Cohen’s kappa for grading of obstruction and detrusor contractility using Schäfer nomogram, were 0.433 and 0.682 respectively. Less agreement in Schäfer nomogram may be due to more fine grading compared with that in BOOI and BCI.


An air-charged catheter system may be a possible alternative to a water filled catheter system in the pressure flow suty. This is small scale study, therefore, a greater number of cases is needed to generalize this concept.