UUI office-based procedure treatments
If behavioral therapies and medications are ineffective, contraindicated, or not the patient’s preference, additional FDA-approved therapies for UUI are available, typically through referral to a urogynecologist, urologist, or continence center.
Posterior tibial nerve stimulation (PTNS) is a nondrug treatment that delivers electrical stimulation using an acupuncture needle for 12 weekly 30-minute sessions followed by monthly maintenance for responders. The time commitment for this treatment plan can be a barrier for some patients. However, patients who adhere to the recommended protocol can expect a 60% improvement in symptoms, with minimal adverse events. Treatment efficacy is comparable to that of anticholinergic medication.24
OnabotulinumtoxinA injections into the bladder muscle are performed cystoscopically under local anesthetic. The toxin blocks the presynaptic release of acetylcholine at the neuromuscular junction, resulting in temporary muscle paralysis. This treatment is associated with high satisfaction. Efficacy varies by study population and outcome measure.
In one US comparative effectiveness trial, 67% of study participants with UUI symptoms refractory to oral medication reported a greater than 50% reduction in OAB symptoms at 6 months, 20% reported complete resolution of UUI, and 72% requested a second injection within 24 months.25 The interval between the first and second injection was nearly 1 year (350 days).Risks include urinary tract infection (12% within 1 month of the procedure and 35% through 6 months); urinary retention requiring catheterization has decreased to 6% with recognition that most moderate retention is tolerated by patients.
Some insurers limit onabotulinumtoxinA treatment coverage to patients who have failed to achieve symptom control with first- and second-line treatments.
SUI-specific nonsurgical treatments
Cystoscopic injection of urethral bulking agents into the urethral submucosa is designed to improve urethral coaptation. It is a minor procedure that can be performed in an ambulatory setting under local anesthetic with or without sedation.
Various bulking agents have been approved for use in the United States, some of which have been withdrawn due to complications of migration, erosion, and pseudoabscess formation. Cure or improvement after bulking agent injection was found to be superior to a home pelvic floor exercise program but inferior to a midurethral sling procedure for cure (9% vs 89%).26
The durability of currently available urethral bulking agents beyond 1 year is unknown. Complications are typically minor and transient and include pain at the injection site, urinary retention, de novo urgency, and implant leakage. The advantages include no postprocedure activity restrictions.
CASE Symptom presentation guides treatment plan
Our patient described symptoms of stress-predominant MUI. She was counseled to moderate her fluid intake to 2 L per day and to strategically time voids (before exercise, and at least every 4 hours). The patient was fitted with an incontinence pessary, and she elected to pursue a course of supervised physical therapy for pelvic floor muscle strengthening. Her follow-up visit is scheduled in 3 months to determine if other interventions are warranted. ●