Midurethral slings (MUS) are a proven effective treatment option for stress urinary incontinence (SUI) and have become the gold standard in most centres in North America. MUS implantation can be associated with risks that are common to all anti-incontinence surgeries, and others which are unique. This article reviews the intraoperative and the early and late postoperative risks associated with these procedures, with insights into their prevention, diagnosis, and management drawn from the literature and expert opinion. In most cases, careful patient counselling before and after surgery, along with meticulous surgical technique, can mitigate risk and patient concern. Even in the best of hands, however, complications will occur, so surgeons must have a high index of suspicion and a low threshold to investigate.
IntroductionStress urinary incontinence (SUI) affects a large proportion of females, with some studies estimating between 4-35% of the adult female population.1,2 Midurethral slings (MUS) are an effective treatment option for SUI after conservative treatments like pessaries and pelvic floor physiotherapy have been attempted.2,3 MUS procedures have high subjective cure rates ranging from 64-97% at 10-year followup. 2,4,5 Despite their documented efficacy in treating SUI, these devices can be associated with various complications. Studies report that 4% of patients develop one or more complications associated with their MUS procedure.6,7 Herein, we review the prevention, diagnosis, and management of the potential intraoperative, early (<90 days) postoperative, and late (>90 days) postoperative risks of MUS implantation.
Intraoperative complicationsIntraoperative complications are the result of injury to adjacent structures either during the dissection to place the trocar or during passage of the trocar itself. Many different MUS products are available, including top-down and bottom-up retropubic devices, and outside-in or inside-out transobturator devices. The decision on which device to use may be based on which device a surgeon trained on, which device is available at his or her facility, and occasionally which device is most indicated for a particular patient (i.e., retropubic vs. transobturator). Most surgeons have a preferred device and approach with which they have advanced along the learning curve, a critical point in minimizing complications. 8 In an article by Hilton and Rose, they report that "whilst seductively simple," the MUS tapes are blind and hard to teach. They suggest that to achieve a <5% bladder perforation rate, a surgeon must complete 20-80 cases. 8
Bladder perforationIntraoperative bladder perforation represents the most common intraoperative complication in MUS surgery and occurs when the trocar is inadvertently inserted into the bladder. Based on the Cochrane review by Ford, this risk is much higher with retropubic (4.5%) vs. transobturator devices (0.6%). 5 It is recommended that surgeons use a cystoscope sheath or catheter with stylet to deflect the bladder neck to the side ...