Comparison of transcutaneous electrical tibial nerve stimulation for the treatment of overactive bladder: a multi-arm randomized controlled trial with blinded assessment

Comparative Efficacy of Neuromodulation Technologies for Overactive Bladder in Adults: A Network Meta-Analysis of Randomized Controlled Trials

OBJECTIVE

The aim of this study was to investigate the comparative efficacy of neuromodulation technologies for overactive bladder (OAB) syndrome in adults.

DATA SOURCES

A computerized search was conducted of Cochrane Library, EMBASE, MEDLINE (via PubMed), Web of Science, CNKI, Wan Fang Data, and ClinicalTrials.gov up to April 21, 2022.

STUDY SELECTION

The search selected clinical trials with random allocation to percutaneous tibial nerve stimulation (PTNS), transcutaneous tibial nerve stimulation (TTNS), vaginal electrical stimulation (VES), sacral neuromodulation (SNM), parasacral stimulation (PS), pudendal neuromodulation, or placebo.

DATA EXTRACTION

The main outcomes were the voiding diary, OAB-related quality of life, and positive response rate. The Cochrane Risk of Bias tool (RoB 2.0) was used to assess the risk of bias of each included study, and the Grading of Recommendations Assessment, Development, and Evaluation tool was used to evaluate the overall evidence quality of key outcomes.

DATA SYNTHESIS

The study included 21 randomized controlled trials involving 1433 participants, and all trials were used for the meta-analysis. In the network meta-analyses, five of six neuromodulation technologies, including PTNS, TTNS, VES, SNM, and PS, were related to higher efficacy than the placebo. Ranking probability showed that SNM was the most efficacious therapy for improving OAB-related quality of life, urinary episodes, and urinary frequency. For urgency incontinence episodes and the number of pads, PTNS and TTNS were the most efficacious modalities, respectively.

CONCLUSION

Neuromodulation technologies, including PTNS, TTNS, VES, SNM, and PS, may be effective and safe solutions for OAB syndrome in adults. Moreover, SNM is the most efficacious regimen for OAB-related quality of life, urinary episodes, and urinary frequency. PTNS and TTNS are the most efficacious modalities for reducing urgency incontinence episodes and the number of pads, respectively. Future studies should pay more attention to the quality of study design and report, patients who may benefit the most from neuromodulation, and the long-term effect, cost-effectiveness, and satisfaction of neuromodulation.

The Effect of Transcutaneous Posterior Tibial Nerve Stimulation on Pain and Quality of Life in Patients with Fibromyalgia: A Single-Blind, Randomized Controlled Trial

This study aimed to investigate the effectiveness of posterior tibial nerve stimulation (PTNS) in reducing pain, improving quality of life, and decreasing disease severity in patients with fibromyalgia. This prospective, single-blind, randomized controlled trial included female patients newly diagnosed with fibromyalgia who had started duloxetine treatment (30 mg/day). The patients in the study group received six sessions of posterior tibial nerve stimulation, twice weekly, 3-4 days apart, in addition to duloxetine; the controls received duloxetine only. The patients were evaluated three times (at baseline, 1st month, and 3rd month). Pain was evaluated using a numeric rating scale, the short-form McGill Pain Questionnaire, and quality of life with a 36-item short-form health survey (SF-36). Patient functional status and disease severity were evaluated using the fibromyalgia impact questionnaire (FIQ). A total of 64 patients met the inclusion criteria: 22 were ultimately included in the study group and 30 in the control group. Statistical improvements in pain and FIQ scores were observed after treatment in both groups. The SF-36 scores indicated improved vitality only in the 1st month in both groups, with no significant changes in the other quality-of-life subscales in either group. There was no statistical difference between the two groups in terms of changes in pain, FIQ, and SF-36 scores compared with baseline at the 1st month and 3rd month. The addition of PTNS to pharmacological treatment did not contribute to the reduction in pain or improvement in quality of life in fibromyalgia either in the 1st or 3rd month. NIH Clinical Trial Registration Number NCT05937711.

Physical Agent-Based Treatments for Overactive Bladder: A Review

Almost one-fifth of the people in the world experience a decrease in quality of life due to overactive bladder (OAB) syndrome. The main bothersome symptoms are urgency accompanied by urinary frequency and nocturia. This chronic, disabling condition is first managed by reducing fluid intake and pelvic floor muscle training, supplemented with antimuscarinic drugs, if necessary. However, refractory cases often still occur. In more severe cases, invasive surgical interventions can be considered; yet, the success rate is still inconsistent, and there is a high complication rate. This condition is frustrating for patients and challenging for the medical staff involved. Although its pathophysiology has not been fully elucidated, peripheral autonomic somatic and sensory afferent receptors are considered to be involved in this condition. Hence, currently, physical agent-based treatments such as neuromodulation have taken a significant place in the third-line therapy of OAB. The efficacy and safety profiles of electrical and magnetic stimulation continue to evolve. Physical-based agents provide an appealing option owing to their effectiveness and minimal side effects. In addition, more physical therapies using light and shock energy are currently being investigated. Thus, a comprehensive understanding of these modalities is an extremely important aspect to provide the most suitable modalities for patients.