Impact of 6F dual lumen urethral channel catheter on flow rate during video-urodynamic investigations
BAUS ePoster online library. Toia B. 06/24/19; 259516; P3-2
Bogdan Toia
Bogdan Toia
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The thinnest catheter compliant with guidelines for good urodynamic practices is the 6F dual lumen. We have assessed the effect on flow rate of a 6Ch urodynamic catheter.

Patients and methods
A prospectively collected database of video-urodynamic (VUDS) tests performed with a 6Ch dual lumen urethral catheter in a tertiary centre between 2016-2018 was screened for adult patients who voided at least 150ml on free flow immediately before their VUDS.
Patients who voided off detrusor overactivity, had non-diagnostic VUDS or incomplete data were excluded.


413 patients met the inclusion criteria. 39 (9.4%) were excluded as they did not have a representative void during their VUDS due to inhibition (36) or catheter related pain (3). A further 19 (4.6%) were excluded, as they were unable to void with the catheter in situ.
The remaining 355 patients (221 women and 134 men, mean age 52± 15y had a significantly higher mean maximum flow rate (Qmax) on their free flow Qmax= 21.7±10.9 ml/s compared to a Qmax= 14.9±8.3 ml/s with the catheter in situ (p<0.001). The 65 (18.3%) patients that voided sitting during VUDS also had reduced Qmax (17.4±9ml/s) compared to free flow (22.4±9ml/s). Statistically significant differences were noted in Qmax before and after catheterisation in 3 of the 4 patient groups in both women and men as detailed in Table 1.


The 6F catheter significantly influences urinary flow and might lead to inability to void in 5%. Free flow remains an essential component of urodynamic investigations.

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