Objective To explore function of the lower urinary tract and morphology of tape and urethra following Monarc or TVT-O suburethral tape placement for urodynamic stress incontinence (USI). Methods We recruited prospectively women undergoing either Monarc or TVT-O placement for USI. Before and 3 months after the procedure, participants were evaluated by a question-directed interview, the measures of Sandvik Incontinence Severity Index (SISI), Incontinence Bother Scale (IBS), Ingelman-Sundberg Score (ISS) and short forms of Urogenital Distress Inventory (UDI-6) and Incontinence Impact Questionnaire (IIQ-7), physical examination, a cough stress test and 4D ultrasound investigation. The primary outcome was participants' responses to clinical assessments and the secondary outcome was ultrasound findings. Results A total of 67 women with Monarc procedures and 60 women with TVT-O procedures completed the survey both preoperatively and 3 months postoperatively. There were significant improvements in scores of SISI, IBS, ISS, UDI-6 and IIQ-7 after both Monarc and TVT-O procedures. At the 3-month follow-up, both procedures had similar success rates, SISI scores, IBS scores, ISS scores, UDI-6 scores and IIQ-7 scores, and similar incidences of postoperative voiding difficulty and overactive bladder symptoms. After Bonferroni correction, all ultrasound parameters representing tape location, tape tension and urethral mobility were similar between the two procedures. Conclusions At short-term follow-up, Monarc and TVT-O procedures are comparable in both functional outcome of the lower urinary tract and morphology on ultrasound as assessed by parameters representing tape location, tape tension and urethral mobility.
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