Detrusor underactivity and complicated stress urinary incontinence: a cross-data study.

Introduction: It is still uncertain whether detrusor underactivity (DUA) influences the outcomes of women undergoing surgery for stress urinary incontinence (SUI). Even less evidence is available about women with complicated stress urinary incontinence (C-SUI). The aim of the study was to assess outcomes of middle urethral sling (MUS) placement according to the type of SUI, and the impact of DUA on uncomplicated SUI (U-SUI) and C-SUI functional and surgical results.

Material and methods: The study was conducted among patients undergoing MUS. The population was divided into 4 groups: 1: C-SUI with DUA; 2: C-SUI without DUA; 3: U-SUI with DUA; and 4: U-SUI without DUA. Women were qualified for the DUA group if they met one of the Jeong, Abarbanel and Marcus, BVE, and PIP1 Griffiths criteria. Post-operative functional outcomes and differences in POUR rate, de novo overactive bladder syndrome (OAB), and SUI recurrence were examined.

Results: 142 women took part in the study, of whom 97 completed the 2-year follow-up. DUA was found in 54.6% (53/97) of patients. C-SUI was prevalent also in the no-DUA group (59.1%). Post-operative ICIQ-FLUTS improved more in the no-DUA patients compared to the DUA women. Post-operative Qmax was statistically significant higher the in no-DUA than in the DUA population. After surgery, neither the PVR nor the PVR ratio differed in the DUA and the no-DUA patients. C-SUI and U-SUI patients showed a POUR rate of 15.6%-12.1%, de novo OAB 12.5%-3%, tape incision 3.1%-3%, and SUI recurrence 4.6%-3%, respectively.

Conclusions: The impact of pre-operative DUA on the outcomes of patients undergoing MUS was negligible, even in C-SUI cases. DUA women with SUI, even if complicated, should not be excluded from this kind of surgery.