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Neurourol Urodyn. 2009;28(8):944-8. doi: 10.1002/nau.20729.

Bladder outlet obstruction in painful bladder syndrome/interstitial cystitis.

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Department of Urology, University of Michigan, Ann Arbor, Michigan, USA.



Obstructive symptoms such as slow stream, dribbling and straining are often reported by painful bladder syndrome and interstitial cystitis (PBS/IC) patients. Our hypothesis was that some patients with PBS/IC have an associated measurable bladder outlet obstruction (BOO) secondary to dysfunctional voiding and that those patients with more severe PBS/IC are more likely to have BOO.


This is a retrospective chart review of female patients diagnosed with PBS/IC based on the NIDDK research definition. Charts were reviewed for clinical symptom severity, ulcer or non-ulcer PBS/IC on cystoscopy, and pressure-flow urodynamics (UDPF). Patients were excluded if they had a urinary infection at the time of urodynamics or did not meet study entry requirements. The cut-off values of <or=12 ml/sec and >or=25 cm of water was used to define BOO.


Of the 231 women: 38 had ulcer PBS/IC and 193 had non-ulcer PBS/IC. MCC was 269 ml in non-ulcer PBS/IC and 200 ml in ulcer PBS/IC (P = 0.006). One hundred eleven women (48%) met criteria for obstruction. MCC was 298 ml in the non-obstructed group and 214 ml in the obstructed group (P < 0.0001). The maximum flow with non-ulcer PBS/IC was 11.0 ml/sec and in ulcer PBS/IC 8.9 ml/sec (P = 0.04) Detrusor pressure at maximum flow was 33.3 cm H(2)O, in non-ulcer, and 37.4 cm H(2)O in ulcer PBS/IC (P = 0.01).


Forty-eight percent of our PBS/IC patients have BOO, and increasing severity of PBS/IC is associated with higher voiding pressure.

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