Comparative study of the effects of magnetic versus electrical stimulation on inhibition of detrusor overactivity

Effect of magnetic therapy in bladder dysfunction and quality of life in paraplegic patients

BACKGROUND

Urinary dysfunction is linked to spinal cord injury (SCI). The quality of life (QoL) declines in both neurogenic bladder impairment and non-disordered patients.

OBJECTIVE

To ascertain the effectiveness of pulsed magnetic therapy on urinary impairment and QoL in individuals with traumatic incomplete SCI.

METHODS

This study included forty male paraplegic subjects with neurogenic detrusor overactivity (NDO) for more than one year following incomplete SCI between T6-T12. Their ages ranged from 20 to 35 and they engaged in therapy for three months. The subjects were divided into two groups of equal size. Individuals in Group I were managed via pulsed magnetic therapy once per week plus pelvic floor training three times a week. Individuals in Group II were managed with only three times a week for pelvic floor training. All patients were examined for bladder cystometric investigations, pelvic-floor electromyography (EMG), and SF-Qualiveen questionnaire.

RESULTS

There was a noteworthy increment in individuals in Group I in volume of bladder at first desire to void and maximum cystometric capacity, detrusor pressure at Qmax, and maximum flow rate. There was a momentous increment in Group I in measures of evaluation of EMG biofeedback. There was a notable rise in Group I in SF-Qualiveen questionnaire.

CONCLUSION

Magnetic stimulation should be favored as beneficial adjunct to traditional therapy in the management of bladder impairment and enhancing QoL in individuals with SCI.

Approach of Chronic Pelvic Pain with Top Flat Magnetic Stimulation

Materials and Methods

Vulvar Functional Status Questionnaire (VQ) was used for the evaluation of patient's chronic pelvic pain and muscle hypertone improvements. The interstitial cystitis was assessed by the Leary-Sant symptom and problem indexes (ICSI and ICPI). In this study, the scores resulting from the sum of the two indexes were evaluated as OSS (ICSI + ICPI).

Results

Women with chronic pelvic pain and muscle hypertone showed VQ mean values significantly lower than the controls (p  <  0.005) from the second treatment up to the sixth one. In 6 patients affected by interstitial cystitis, the mean score of OSS was significantly lower than the controls (p  <  0.005) from the second treatment up to 2 months follow-up after the last treatment session. No side effects were observed.

Conclusion

Based on these results, this technology may successfully manage muscle hypertonicity condition, the chronic pelvic pain, and interstitial cystitis.

Evaluation of Possible Side Effects in the Treatment of Urinary Incontinence with Magnetic Stimulation

Background and Objectives: Magnetic stimulation is a type of conservative treatment of urinary incontinence. Our aim was to evaluate the possible side effects of this method. Materials and Methods: We conducted a systematic literature review. The key search terms were urinary incontinence, magnetic stimulation, and female. All known synonyms were used. Results: 255 titles and abstracts were retrieved, and 28 articles met our inclusion criteria. Out of 28 studies, 15 reported no side effects, five reported side effects, and eight did not report anything. There was no significant difference in the incidence of side effects between the sham and active treatment groups. Conclusions: Side effects of magnetic stimulation in comparison to other active treatments are minimal and transient. Among the conservative UI treatment methods, magnetic stimulation is one of the safest methods for the patient and as such a suitable first step in treating UI.

Effects of repetitive functional magnetic stimulation in the sacral nerve in patients with neurogenic detrusor overactivity after suprasacral spinal cord injury: a study protocol for a randomized controlled trial

BACKGROUND

Neurogenic detrusor overactivity (NDO) is a serious and common complication after spinal cord injury, affecting patients' quality of life seriously. Therefore, we developed this research protocol to evaluate the efficacy of repetitive functional magnetic stimulation (rFMS) in the sacral nerve in patients with neurogenic detrusor overactivity (NDO) after suprasacral spinal cord injury (SCI) and provide more options for rFMS in treating NDO after suprasacral SCI.

METHODS

This study is a single-center, randomized, parallel-group clinical trial. We will recruit the patients with NDO after suprasacral SCI in the Rehabilitation Department of the Affiliated Hospital of Southwest Medical University from September 2022 to August 2023. They will be assigned to the rFMS group and the sham stimulation group randomly. The sample size is 66, with 33 patients in each group. The rFMS group will receive real rFMS treatment of the sacral nerve (100% stimulation intensity, 5 Hz, 20 min each time, five times a week), and the sham group will receive sham stimulation. Both groups will receive similar treatment strategies, including medication, standard urine management, acupuncture treatment, and health education. The bladder compliance (bladder capacity/detrusor pressure) and pudendal nerve electromyography will be evaluated at baseline, 8th week of treatment. The residual volume of the bladder and bladder diary will be recorded once a week during 8 weeks of treatments. SCI-QOL and NBSS will be evaluated at baseline, the 4th and 8th week of treatment. In addition, the above assessments will be followed up at 8 weeks after the end of treatment.

DISCUSSION

It is expected that the bladder function, symptoms, and quality of life might be significantly improved after rFMS of the sacral nerve.

TRIAL REGISTRATION

The China Clinical Trials Registry has approved this study, registration number: ChiCTR2100045148. Registered on April 7, 2021.

Short-term effect of magnetic stimulation added to bladder training in women with idiopathic overactive bladder: A prospective randomized controlled trial

OBJECTIVE

To evaluate the efficacy of magnetic stimulation (MStim) added to bladder training (BT) on incontinence-related quality of life (QoL) and clinical parameters in women with idiopathic overactive bladder (OAB).

MATERIAL AND METHODS

Seventy-six women with idiopathic OAB were randomized into two groups using the random numbers generator as follows: Group 1 received BT alone (n: 38), and Group 2 received BT + MStim (n: 38). MStim was performed with MStim therapy armchair (Novamag NT60), 2 days a week, 20 min a day, a total of 12 sessions for 6 weeks. Women were evaluated in terms of incontinence severity (24-h pad test), 3-day voiding diary (frequency of voiding, incontinence episodes, nocturia, and number of pads), symptom severity (OAB-V8), QoL (IIQ-7), positive response and cure-improvement rates, and treatment satisfaction (Likert scale) at the baseline and the end of treatment (sixth week).

RESULTS

A statistically significant improvement was found in incontinence severity, frequency of voiding, incontinence episodes, nocturia, number of pads, symptom severity, and QoL parameters for two groups at the end of the treatment compared to the baseline values (p < 0.05). At the end of treatment; incontinence severity, incontinence episodes, nocturia, number of pads, symptom severity, and QoL were significantly improved in Group 2 compared to Group 1 (p < 0.05). No difference was found between the two groups in terms of frequency of voiding (p > 0.05). The positive response and cure-improvement rates, and treatment satisfaction were significantly higher in Group 2 than in Group 1 (p < 0.05).

CONCLUSION

MStim added to BT is more effective than BT alone in women with idiopathic OAB.

Is It Possible to Improve Urinary Incontinence and Quality of Life in Female Patients? A Clinical Evaluation of the Efficacy of Top Flat Magnetic Stimulation Technology

Background and Objectives: Urinary incontinence is the accidental loss of urine that can occur at any age, especially among women over 50; however, its prevalence is increasing. This study aimed to assess the efficacy and safety of a device that uses Top Flat Magnetic Stimulation for the management of women with mixed urinary incontinence. Materials and Methods: A total of 50 female patients underwent a total of six treatment sessions performed twice a week for three consecutive weeks, for 28 min. Three questionnaires were used for the evaluation of the urinary improvements: Urinary Incontinence Short Form (ICIQ-UI-SF), Incontinence Questionnaire Overactive Bladder Module (ICIQ-OAB), and Incontinence Impact Questionnaire-Short Form (IIQ-7). The questionnaires were compiled immediately before each treatment, within the treatment period (until the sixth treatment session), and up to 3 months of follow-up. Results: Improvement in quality of life is observed according to the results of the questionnaire, already after six sessions and at three months follow-up. ICIQ-UI-SF’s average score at baseline was 20.2 (±1.1), and it significantly declined (p < 0.01) to 1.8 (±2.4) after six sessions and to 4.8 (±2.8) at 3 months follow-up; ICIQ-OAB’s average score significantly decreased (p < 0.01) from 10.4 (±3.2) at baseline to 1.4 (±0.8) after six sessions and 2.3 (±1.6) at 3 months follow-up. IIQ-7’s average score significantly decreased (p < 0.01) from 20.2 (±1.7) at baseline to 0.4 (±0.5) after six sessions and to 4.7 (±2.8) at 3 months follow-up. Conclusions: Our results suggest that Top Flat Magnetic Stimulation technology can reduce mixed urinary incontinence symptoms for all women examined, leading to an improvement in the patient quality of life and patient awareness of their pelvic floor area with good results.

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

OBJECTIVE

To compare the effectiveness of tibial nerve transcutaneous electrical nerve stimulation (TENS) for an overactive bladder, considering the sites of application and frequency of attendance.

METHODS

This multi-arm randomized controlled trial enrolled 137 adult women (61.0±9.0 years) with overactive bladder from a university hospital. They underwent 12 sessions of 30-min TENS application and were assigned to five groups: one leg, once a week (n=26); one leg, twice a week (n=27); two legs, once a week (n=26); two legs, twice a week (n=28); and placebo (n=30). Symptoms of overactive bladder and its impact on quality of life were evaluated before and after 6 or 12 weeks of treatment using the Overactive Bladder Questionnaire-V8 and voiding diary. ClinicalTrials.gov: NCT01912885.

RESULTS

The use of one leg, once a week TENS application reduced the frequency of urgency episodes compared with the placebo (1.0±1.6 vs. 1.4±1.9; p=0.046) and frequency of incontinence episodes compared with the placebo (0.7±1.4 vs.1.4±2.2; p<0.0001). The one-leg, twice a week protocol decreased the urinary frequency compared with the two legs, once a week protocol (8.2±3.5 vs. 9.0±5.1; p=0.026) and placebo (8.2±3.5 vs. 7.9±2.7; p=0.02). Nocturia improved using the two legs, once a week protocol (1.5±1.8) when compared with the one leg, twice a week protocol (1.9±2.0) and placebo (1.7±1.6) (p=0.005 and p=0.027, respectively). Nocturia also improved using the two legs, twice a week protocol when compared with the one leg, twice a week protocol (1.3±1.2 vs.1.9±2.0; p=0.011).

CONCLUSION

One-leg stimulation improved the daily urinary frequency, urgency, and incontinence, and the two-leg stimulation once and twice weekly improved nocturia.

Modulation of H-reflex responses and frequency-dependent depression by repetitive spinal electromagnetic stimulation: From rats to humans and back to chronic spinal cord injured rats

The lack of propagation of signals through survived fibers is among the major reasons for functional loss after incomplete spinal cord injury (SCI). Our recent results of animal studies demonstrate that spinal electromagnetic stimulation (SEMS) can enhance transmission in damaged spinal cord, and this type of modulation depends on the function of NMDA receptors at the neuronal networks below the injury level. Here, our pilot human study revealed that administration of repetitive SEMS induced long‐lasting modulation of H‐responses in both healthy and participants with chronic SCI. In order to understand the mechanisms underlying these effects, we have used an animal model and examined effects of SEMS on H‐responses. Effects of SEMS on H‐responses, frequency‐dependent depression (FDD) of H‐reflex, and possible underlying mechanisms have been examined in both naïve and rats with SCI. Our results demonstrate that consistent with the effects of SEMS on H‐reflex seen in humans, repetitive SEMS induced similar modulation in excitability of peripheral nerve responses in both non‐injured and rats with SCI. Importantly, our results confirmed the reduced FDD of H‐reflex in SCI animals and revealed that SEMS was able to recover FDD in rats with chronic SCI. Using intraspinal injections of the NMDA receptor blocker MK‐801, we have identified NMDA receptors as an important contributor to these SEMS‐induced effects in rats with SCI. These results identify SEMS as a novel non‐invasive technique for modulation of neuro‐muscular circuits and, importantly, modulation of spinal networks after chronic SCI.

[An International Urogynecological Association (IUGA)/International Continence Society (ICS) joint report on the terminology for the conservative and non-pharmacological management of female pelvic floor dysfunction]

INTRODUCTION

There has been an increasing need for the terminology for the conservative management of female pelvic floor dysfunction to be collated in a clinically-based consensus report.

METHODS

This report combines the input of members and elected nominees of the Standardization and Terminology Committees of two International Organizations, the International Urogynecological Association (IUGA) and the International Continence Society (ICS), assisted at intervals by many external referees. An extensive process of nine rounds of internal and external review was developed to exhaustively examine each definition, with decision-making by collective opinion (consensus). Before opening up for comments on the webpages of ICS and IUGA, five experts from physiotherapy, neurology, urology, urogynecology and nursing were invited to comment on the paper.

RESULTS

A terminology report for the conservative management of female pelvic floor dysfunction, encompassing over 200 separate definitions, has been developed. It is clinically-based with the most common symptoms, signs, assessments, diagnoses and treatments defined. Clarity and user-friendliness have been key aims to make it interpretable by practitioners and trainees in all the different specialty groups involved in female pelvic floor dysfunction. Ongoing review is not only anticipated but will be required to keep the document updated and as widely acceptable as possible.

CONCLUSION

A consensus-based terminology report for the conservative management of female pelvic floor dysfunction has been produced aimed at being a significant aid to clinical practice and a stimulus for research.

The effectiveness of magnetic stimulation for patients with pelvic floor dysfunction: A systematic review and meta-analysis

AIMS

To evaluate the value of magnetic stimulation (MS) in patients with pelvic floor dysfunction (PFD).

METHODS

The Preferred Reporting Items for Systematic Review and Meta-analysis (PRISMA) statement was followed. We searched five databases for articles published until November 2017. Included studies investigated the effects of MS on PFD. Meta-analysis of RCTs was performed using a random effects model, and narrative analysis was undertaken where meta-analysis was not possible.

RESULTS

A total of 20 studies including 1019 patients were eligible for inclusion whose level of evidence for the included studies was low. Meta-analysis of four trials comparing MS with sham intervention showed that MS was not associated with significant improvement in ICIQ-SF score (-0.52, 95%CI -1.05, 0.01; P = 0.06, I²  = 16%), QOL score (-0.27, 95%CI -0.57, 0.04; P = 0.09, I²  = 0%), number of leakages (-0.16, 95%CI -0.62, 0.29; P = 0.48, I²  = 52%), and pad test (-1.36, 95%CI -2.64, -0.08; P = 0.04, I²  = 94%). Narrative review showed that there were no convincing evidences that MS was effective for chronic pelvic floor pain, detrusor overactivity, overactive bladder, and the included RCTs had controversial results. MS may have some benefits for nocturnal enuresis and erectile dysfunction according to the trials.

CONCLUSIONS

There is no convinced evidence to support the benefits of using MS in the management of PFD. The applicability of MS in the treatment of PFD remains uncertain, so larger, well-designed trials with longer follow-up periods adopted relevant and comparable outcomes are needed to be further explored to provide a definitive conclusion.

Effects of magnetic stimulation on urodynamic stress incontinence refractory to pelvic floor muscle training in a randomized sham-controlled study

OBJECTIVE

The aim of the present study was to evaluate the effect of magnetic stimulation on urodynamic stress incontinence refractory to pelvic floor muscle training in a randomized sham-controlled study.

METHODS

Female patients with urodynamic stress incontinence who had not been cured by pelvic floor muscle training were randomly assigned at a ratio of 2 : 1 to either active treatment or sham treatment for 10 weeks. The randomization was made using magnetic cards for individuals indicating active or sham stimulation. The primary endpoint was changes in the number of incontinence episodes/week, with secondary endpoints of the degree of incontinence (in g/day; determined using the pad test), the total score on the International Consultation on Incontinence Questionnaire - Short Form (ICIQ-SF), the ICIQ quality of life (QOL) score, and the abdominal leak point pressure (ALPP) on urodynamic study.

RESULTS

Although 39 patients were enrolled in the study, 9 dropped out, leaving a total patients for analysis (18 in the active treatment group, 12 in the sham treatment group). The number of incontinence episodes/week, the degree of incontinence, total ICIQ-SF score, ICIQ-QOL score, and ALPP were significantly improved after active treatment compared with baseline (all P < .05), but did not change significantly after sham treatment. There was a significant intergroup difference with regard to changes from baseline in the ICIQ-SF and ALPP in favor of the active treatment group (P < .05). There were no significant differences in any other parameters between the 2 groups. Treatment-related adverse events were not found in both groups.

CONCLUSION

Magnetic stimulation was effective in treating urodynamic stress incontinence.

Electrical stimulation with non-implanted electrodes for overactive bladder in adults

BACKGROUND

Several options exist for managing overactive bladder (OAB), including electrical stimulation (ES) with non-implanted devices, conservative treatment and drugs. Electrical stimulation with non-implanted devices aims to inhibit contractions of the detrusor muscle, potentially reducing urinary frequency and urgency.

OBJECTIVES

To assess the effects of ES with non-implanted electrodes for OAB, with or without urgency urinary incontinence, compared with: placebo or any other active treatment; ES added to another intervention compared with the other intervention alone; different methods of ES compared with each other.

SEARCH METHODS

We searched the Cochrane Incontinence Specialised Register, which contains trials identified from the Cochrane Central Register of Controlled Trials (CENTRAL), MEDLINE, MEDLINE In-Process, ClinicalTrials.gov, WHO ICTRP and handsearching of journals and conference proceedings (searched 10 December 2015). We searched the reference lists of relevant articles and contacted specialists in the field. We imposed no language restrictions.

SELECTION CRITERIA

We included randomised or quasi-randomised controlled trials of ES with non-implanted devices compared with any other treatment for OAB in adults. Eligible trials included adults with OAB with or without urgency urinary incontinence (UUI). Trials whose participants had stress urinary incontinence (SUI) were excluded.

DATA COLLECTION AND ANALYSIS

Two review authors independently screened search results, extracted data from eligible trials and assessed risk of bias, using the Cochrane 'Risk of bias' tool.

MAIN RESULTS

We identified 63 eligible trials (4424 randomised participants). Forty-four trials did not report the primary outcomes of perception of cure or improvement in OAB. The majority of trials were deemed to be at low or unclear risk of selection and attrition bias and unclear risk of performance and detection bias. Lack of clarity with regard to risk of bias was largely due to poor reporting.For perception of improvement in OAB symptoms, moderate-quality evidence indicated that ES was better than pelvic floor muscle training (PFMT) (risk ratio (RR) 1.60, 95% confidence interval (CI) 1.19 to 2.14; n = 195), drug treatment (RR 1.20, 95% 1.04 to 1.38; n = 439). and placebo or sham treatment (RR 2.26, 95% CI 1.85 to 2.77, n = 677) but it was unclear if ES was more effective than placebo/sham for urgency urinary incontinence (UUI) (RR 5.03, 95% CI 0.28 to 89.88; n = 242). Drug treatments included in the trials were oestrogen cream, oxybutynin, propantheline bromide, probanthine, solifenacin succinate, terodiline, tolterodine and trospium chloride.Low- or very low-quality evidence suggested no evidence of a difference in perception of improvement of UUI when ES was compared to PFMT with or without biofeedback.Low- quality evidence indicated that OAB symptoms were more likely to improve with ES than with no active treatment (RR 1.85, 95% CI 1.34 to 2.55; n = 121).Low- quality evidence suggested participants receiving ES plus PFMT, compared to those receiving PFMT only, were more than twice as likely to report improvement in UUI (RR 2.82, 95% CI 1.44 to 5.52; n = 51).There was inconclusive evidence, which was either low- or very low-quality, for OAB-related quality of life when ES was compared to no active treatment, placebo/sham or biofeedback-assisted PFMT, or when ES was added to PFMT compared to PFMT-only. There was very low-quality evidence from a single trial to suggest that ES may be better than PFMT in terms of OAB-related quality of life.There was a lower risk of adverse effects with ES than tolterodine (RR 0.12, 95% CI 0.05 to 0.27; n = 200) (moderate-quality evidence) and oxybutynin (RR 0.11, 95% CI 0.01 to 0.84; n = 79) (low-quality evidence).Due to the very low-quality evidence available, we could not be certain whether there were fewer adverse effects with ES compared to placebo/sham treatment, magnetic stimulation or solifenacin succinate. We were also very uncertain whether adding ES to PFMT or to drug therapy resulted in fewer adverse effects than PFMT or drug therapy alone Nor could we tell if there was any difference in risk of adverse effects between different types of ES.There was insufficient evidence to determine if one type of ES was more effective than another or if the benefits of ES persisted after the active treatment period stopped.

AUTHORS' CONCLUSIONS

Electrical stimulation shows promise in treating OAB, compared to no active treatment, placebo/sham treatment, PFMT and drug treatment. It is possible that adding ES to other treatments such as PFMT may be beneficial. However, the low quality of the evidence base overall means that we cannot have full confidence in these conclusions until adequately powered trials have been carried out, measuring subjective outcomes and adverse effects.

An International Urogynecological Association (IUGA)/International Continence Society (ICS) joint report on the terminology for the conservative and nonpharmacological management of female pelvic floor dysfunction

INTRODUCTION AND HYPOTHESIS

There has been an increasing need for the terminology on the conservative management of female pelvic floor dysfunction to be collated in a clinically based consensus report.

METHODS

This Report combines the input of members and elected nominees of the Standardization and Terminology Committees of two International Organizations, the International Urogynecological Association (IUGA) and the International Continence Society (ICS), assisted at intervals by many external referees. An extensive process of nine rounds of internal and external review was developed to exhaustively examine each definition, with decision-making by collective opinion (consensus). Before opening up for comments on the webpages of ICS and IUGA, five experts from physiotherapy, neurology, urology, urogynecology, and nursing were invited to comment on the paper.

RESULTS

A Terminology Report on the conservative management of female pelvic floor dysfunction, encompassing over 200 separate definitions, has been developed. It is clinically based, with the most common symptoms, signs, assessments, diagnoses, and treatments defined. Clarity and ease of use have been key aims to make it interpretable by practitioners and trainees in all the different specialty groups involved in female pelvic floor dysfunction. Ongoing review is not only anticipated, but will be required to keep the document updated and as widely acceptable as possible.

CONCLUSION

A consensus-based terminology report for the conservative management of female pelvic floor dysfunction has been produced, aimed at being a significant aid to clinical practice and a stimulus for research.

Intracavitary electrical stimulation as treatment for overactive bladder: systematic review

Abstract Introduction: Overactive bladder (OAB) is a clinical diagnosis of irritating urinary symptoms that influence on sufferers' life quality. There are effective treatments described in literature, but most of them present adverse effects. One way of treatment is the use of electrical stimulation, which has been widely used, but studies show varying results. Objective: To verify if intracavitary electrical stimulation can be effective in patients with OAB. Methods: online databases were searched with specific descriptors to find randomized clinical trials on overactive bladder treated with intracavitary electrical stimulation. Only articles with score equal or higher than 5 in methodological PEDro scale were used and those that described intra and / or inter-group P-value. Results: 217 articles were found, but only 6 were analyzed by the selection criteria. The studies show that electrical stimulation promotes the reduction of urinary frequency, urinary incontinence, nocturia, urgency and the number of protectors used, and improvements in maximum cystometric bladder capacity, symptoms of OAB and quality of life. Conclusion: Electrical stimulation was effective in patients with OAB and can be used before any invasive treatment due to none side effects.

A double-blind randomized clinical trial on the efficacy of magnetic sacral root stimulation for the treatment of Monosymptomatic Nocturnal Enuresis

Purpose: Purpose of this study was to evaluate the long term efficacy of repetitive sacral root magnetic stimulation (rSMS) in patients with monosymptomatic nocturnal enuresis (MNE).

Methods: Forty four patients were randomized to receive either sham or real repetitive sacral root magnetic stimulation (rSMS; 15 Hz with a total of 1500 pulses/session) for 10 sessions. Evaluation was performed before starting treatment, immediately after the 5th and 10th treatment session, and 1 month later, using frequency of enuresis/week, visual analogue scale (VAS) and quality of life as outcome measures. Resting and active motor thresholds of gastrocnemius muscles were measured before and after the end of sessions.

Results: Both treatment and control groups were comparable for baseline measures of frequency of enuresis, and VAS. The mean number of wet nights/week was significantly reduced in patients who received real rSMS. This improvement was maintained 1 month after the end of treatment. Patients receiving real-rSMS also reported an improvement in VAS ratings and quality of life. A significant reduction of resting motor threshold was recorded after rSMS in the real group while no such changes were observed in the sham group.

Conclusion: These findings suggest that rSMS has potential as an adjuvant treatment for MNE and deserves further study.

Primary Nocturnal Enuresis: A Review

Context

Nocturnal enuresis or bedwetting is the most common type of urinary incontinence in children. It has significant psychological effects on both the child and the family. Enuresis nocturna is defined as the inability to hold urine during the night in children who have completed toilet training. It is termed as being “primary” if no continence has ever been achieved or “secondary if it follows at least 6 months of dry nights. The aim of this review was to assemble the pathophysiological background and general information about nocturnal enuresis.

Evidence Acquisition

This review was performed by evaluating the literature on nocturnal enuresis published between 1970 and 2015, available via PubMed and using the keywords “nocturnal enuresis,” “incontinence,” “pediatric,” “review,” and “treatment.”

Results

Children with nocturnal enuresis produce urine at higher rates during the night, and may have lower bladder capacities. Some children with nocturnal enuresis may also have daytime urgency, frequency, and urinary incontinence. Treatment includes aggressive treatment of accompanying constipation or urinary tract infections, behavioral changes, and medical therapy. Alarm therapy remains the first-line treatment modality for primary nocturnal enuresis. High rates of patient compliance and relapse mean that alternative treatments remain on the agenda.

Conclusions

Nocturnal enuresis is a common problem that has multifaceted effects on both the child and the family. Due to multiple etiologic factors, nocturnal enuresis is still not clearly defined.

Electrical stimulation with non-implanted electrodes for overactive bladder in adults

BACKGROUND

Several options exist for managing overactive bladder (OAB), including electrical stimulation (ES) with non-implanted devices, conservative treatment and drugs. Electrical stimulation with non-implanted devices aims to inhibit contractions of the detrusor muscle, potentially reducing urinary frequency and urgency.

OBJECTIVES

To determine the effectiveness of: ES with non-implanted electrodes compared with placebo or any other active treatment for OAB; ES added to another intervention compared with the other intervention alone; different methods of ES compared with each other.

SEARCH METHODS

We searched the Cochrane Incontinence Group Specialised Register, which contains trials identified from the Cochrane Central Register of Controlled Trials (CENTRAL), MEDLINE, MEDLINE In-Process, ClinicalTrials.gov, WHO ICTRP and handsearching of journals and conference proceedings (searched 10 December 2014). We searched the reference lists of relevant articles and contacted specialists in the field. We imposed no language restrictions.

SELECTION CRITERIA

We included randomised or quasi-randomised controlled trials of ES with non-implanted devices compared with any other treatment for OAB in adults. Eligible trials included adults with OAB with or without urgency urinary incontinence (UUI). Trials whose participants had stress urinary incontinence (SUI) were excluded.

DATA COLLECTION AND ANALYSIS

Two review authors independently screened search results, extracted data from eligible trials and assessed risk of bias, using the Cochrane Collaboration's 'Risk of bias' tool.

MAIN RESULTS

We identified 51 eligible trials (3443 randomised participants). Thirty-three trials did not report the primary outcomes of subjective change in OAB symptoms. The majority of trials were deemed to be at low or unclear risk of selection and attrition bias and unclear risk of performance and detection bias. Lack of clarity with regard to risk of bias was largely due to poor reporting.Twenty-three trials (1654 participants) compared ES with no active treatment, placebo or sham treatment. Moderate-quality evidence indicated that OAB symptoms were more likely to improve in people receiving ES than with no active treatment, placebo or sham treatment (relative risk (RR) for no improvement 0.54, 95% confidence interval (CI) 0.47 to 0.63). Moderate-quality evidence indicated that similar numbers of people receiving ES and no active treatment, placebo or sham treatment experienced adverse effects.Eight trials (542 participants) compared ES with conservative treatment. Very low-quality evidence suggested no evidence of a difference between ES and PFMT or PFMT plus biofeedback in OAB symptoms (RR for no improvement 0.79, 95% CI 0.51 to 1.21 and 0.97, 95% CI 0.60 to 1.57 respectively). There was no evidence of a difference between ES and conservative treatment with regard to adverse effects.Sixteen trials (894 participants) compared ES with drug treatment (probanthine, tolterodine, oxybutynin, propantheline bromide, solifenacin succinate, terodiline, trospium chloride, terodiline). Moderate-quality evidence indicated that OAB symptoms were more likely to improve with ES than drug treatment (RR for no improvement 0.66, 95% CI 0.48 to 0.90). Low-quality evidence suggested a greater risk of adverse effects with oxybutynin (RR 1.26, 95% CI 1.07 to 1.49) and with tolterodine (RR 1.51, 95% CI 1.21 to 1.89) than with ES. There was insufficient evidence of a difference between ES and trospium hydrochloride (RR 0.73, 95% CI 0.43 to 1.25).Eight trials (252 participants) compared ES combined with another treatment versus the other treatment alone, two trials (48 participants) compared ES plus conservative treatment with no active treatment, placebo or sham treatment and six trials (361 participants) compared different types of ES. None of these comparisons had sufficient evidence to indicate any differences between the treatment groups in terms of OAB or adverse effects.Moderate-quality evidence suggested that ES improved OAB-related quality of life more than no active treatment, placebo or sham treatment. There was insufficient evidence of any difference between ES and any other treatment with regard to quality of life.There was insufficient evidence to determine if the benefits of ES persisted after the active treatment period stopped.

AUTHORS' CONCLUSIONS

Electrical stimulation appeared to be more effective than both no treatment and drug treatment for OAB. There was insufficient evidence to determine if ES was more effective than conservative treatment or which type of ES was more effective. This review underlines the need to conduct well-designed trials in this field measuring subjective outcomes and adverse effects.

Clinical Guideline for Female Lower Urinary Tract Symptoms

The "Japanese Clinical Guideline for Female Lower Urinary Tract Symptoms," published in Japan in November 2013, contains two algorithms (a primary and a specialized treatment algorithm) that are novel worldwide as they cover female lower urinary tract symptoms other than urinary incontinence. For primary treatment, necessary types of evaluation include querying the patient regarding symptoms and medical history, examining physical findings, and performing urinalysis. The types of evaluations that should be performed for select cases include evaluation with symptom/quality of life (QOL) questionnaires, urination records, residual urine measurement, urine cytology, urine culture, serum creatinine measurement, and ultrasonography. If the main symptoms are voiding/post-voiding, specialized treatment should be considered because multiple conditions may be involved. When storage difficulties are the main symptoms, the patient should be assessed using the primary algorithm. When conditions such as overactive bladder or stress incontinence are diagnosed and treatment is administered, but sufficient improvement is not achieved, the specialized algorithm should be considered. In case of specialized treatment, physiological re-evaluation, urinary tract/pelvic imaging evaluation, and urodynamic testing are conducted for conditions such as refractory overactive bladder and stress incontinence. There are two causes of voiding/post-voiding symptoms: lower urinary tract obstruction and detrusor underactivity. Lower urinary tract obstruction caused by pelvic organ prolapse may be improved by surgery.

Computation of induced electric field for the sacral nerve activation

The induced electric field/current in the sacral nerve by stimulation devices for the treatment of bladder overactivity is investigated. Implanted and transcutaneous electrode configurations are considered. The electric field induced in the sacral nerve by the implanted electrode is largely affected by its surrounding tissues, which is attributable to the variation in the input impedance of the electrode. In contrast, the electric field induced by the transcutaneous electrode is affected by the tissue conductivity and anatomical composition of the body. In addition, the electric field induced in the subcutaneous fat in close proximity of the electrode is comparable with the estimated threshold electric field for pain. These computational findings explain the clinically observed weakness and side effect of each configuration. For the transcutaneous stimulator, we suggest that the electrode contact area be increased to reduce the induced electric field in the subcutaneous fat.

Electrical stimulation with non-implanted electrodes for urinary incontinence in men

BACKGROUND

Electrical stimulation with non-implanted devices is used for patients with different types of urinary incontinence and symptoms of urgency, frequency and nocturia. The current review focused on electrical stimulation with non-implanted devices for the treatment of urinary incontinence in men.

OBJECTIVES

To determine the effectiveness of electrical stimulation with non-implanted devices for men with stress, urgency or mixed urinary incontinence in comparison with no treatment, placebo treatment, or any other 'single' treatment. Additionally, the effectiveness of electrical stimulation with non-implanted devices in combination with another intervention was compared with the other intervention alone. Finally, the effectiveness of one method of electrical stimulation with non-implanted devices was compared with another method.

SEARCH METHODS

We searched the Cochrane Incontinence Group Specialised Trials Register, which contains trials identified from the Cochrane Central Register of Controlled Trials (CENTRAL), MEDLINE, PreMEDLINE, and handsearching of journals and conference proceedings (searched 21 January 2012). We also searched other electronic and non-electronic bibliographic databases and the reference lists of the included studies as well as contacting researchers in the field to identify other relevant trials.

SELECTION CRITERIA

Randomized and quasi-randomized controlled trials.

DATA COLLECTION AND ANALYSIS

Two review authors independently assessed all the identified trials for eligibility. Risk of bias was assessed using the Cochrane tool for determining bias. Disagreements were resolved by discussion, and a third review author was involved in the case of no consensus. Data were analysed using Cochrane methods.

MAIN RESULTS

Six randomized controlled trials (five full papers and one abstract) were included. There was considerable variation in the interventions used, study protocols, types of electrical stimulation parameters and devices, study populations and outcome measures. In total 544 men were included, of whom 305 received some form of electrical stimulation, and 239 a control or comparator treatment. The trials were mostly small and generally there was not sufficient information to assess risk of bias; only two trials used secure methods of randomization.There was some evidence that electrical stimulation (ES) had a short-term effect in reducing incontinence compared with sham treatment (for example risk ratio (RR) at six months 0.38, 95% CI 0.16 to 0.87) but not at 12 months. Four trials evaluated the effect of adding PFMT to ES versus pelvic floor muscle training (PFMT) alone or with biofeedback. There was no evidence of a statistically significant difference in the number of men with urinary incontinence at three months (146/239, 61% for combined treatment versus 98/156, 63% with PFMT alone; RR 0.93, 95% CI 0.82 to 1.06). However, there were more adverse effects with combined treatment (23/139, 17% versus 2/99, 2% with PFMT alone; RR 7.04, 95% CI 1.51 to 32.94) and quality of life also seemed better with PFMT alone. One small trial did not detect statistically significant differences between two methods of administration of transcutaneous electrical stimulation (anal versus perineal) but the quality of life score was lower (better) in the anal stimulation group.

AUTHORS' CONCLUSIONS

There was some evidence that electrical stimulation enhanced the effect of PFMT in the short term but not after six months. There were, however, more adverse effects (pain or discomfort) with electrical stimulation.

The use of extracorporeal magnetic innervation for the treatment of stress urinary incontinence in older women: a pilot study

PURPOSE

Stress urinary incontinence (SUI) is a major health problem that has substantial and important effects on health-related quality of life. In recent years, extracorporeal magnetic innervation (ExMI) has become a preferred method of treatment in urinary incontinence. This study presents the effects of ExMI treatment on pelvic floor muscle strength, urinary symptoms, incontinence conditions and quality of life of older women with SUI.

METHODS

A total of 13 patients between the ages of 61 and 69 (mean 65.23 ± 2.8 years) were treated for SUI with ExMI. The following parameters were investigated: urinary symptoms, pelvic floor electromyographic (EMG) activity, 1-h pad test, incontinence conditions utilizing visual analog scale (VAS) and quality of life using Turkish version of the Urogenital Distress Inventory (UDI-6) and the Incontinence Quality of Life Instrument (I-QoL). All assessments were conducted at baseline and at the end of the study. Treatment lasted for 20 min, twice a week and for a total of 6 weeks.

RESULTS

The urinary symptoms and incontinence conditions decreased after the ExMI treatment sessions. The pad test results indicated a reduction in urine loss (p = 0.016). EMG values were improved (p = 0.005). Scores of I-QoL, UDI-6 and VAS were reduced after the treatment, respectively (p = 0.002), (p = 0.002) and (p = 0.006).

CONCLUSION

Extracorporeal magnetic innervation can be considered as it is an alternative, non-invasive and painless treatment method with good compliance for treatment of SUI in older patients.

Comparison of alpha-blocker, extracorporeal magnetic stimulation alone and in combination in the management of female bladder outlet obstruction

INTRODUCTION AND HYPOTHESIS

To determine the effects of alpha-blocker, extracorporeal magnetic innervations (ExMI) alone and combination treatment on female bladder outlet obstruction (BOO).

METHODS

Sixty women with BOO were divided into three groups according to the treatment. After 3 months, the clinical outcomes were evaluated by clinical examination, international prostatic symptom score (IPSS), quality of life (QOL), 3-day voiding diary, uroflowmetry and post-void residual.

RESULTS

At 3 months, symptom improvement was 52.6% in alpha-blocker monotherapy (group I), 50.0% in ExMI monotherapy (group II), and 57.1% in combination therapy (group III). Maximum flow rate increased and total IPSS decreased significantly in all groups (p < 0.05). Storage symptom subscore was more reduced in groups II and III and QOL improved significantly in group III (p < 0.05)

CONCLUSIONS

This study demonstrates that both alpha-blocker and ExMI were effective in female BOO, and ExMI may be more effective for improving storage symptoms.

[Conservative management of postoperative urinary incontinence in men]

Urinary incontinence in men most commonly occurs after radical prostatectomy. Of these patients, 3-23% remain incontinent a year after prostatectomy. Data on conservative therapy for postoperative incontinence is contradictory. Nonetheless, conservative treatment strategies must generally be attempted before any operative technique. Early pelvic floor muscle training with or without biofeedback therapy and duloxetine seem to have a positive effect on continence. Further randomised controlled studies are necessary to accurately assess other conservative therapeutic options such as extracorporeal magnetic innervation and electrical stimulation therapy.

Extracorporeal magnetic stimulation for the treatment of stress and urge incontinence in womenResults of 1‐year follow‐up

OBJECTIVE

To evaluate the clinical efficacy of extracorporeal magnetic stimulation for the treatment of stress and urge urinary incontinence in women.

MATERIAL AND METHODS

A total of 35 patients with stress incontinence and 17 with urge incontinence were enrolled in this study. All patients were evaluated by means of a detailed history of incontinence, a gynecologic examination, urine culture, urinary system ultrasound and a urodynamic study. All patients were asked to keep a 3-day voiding diary. A pad-weighing test was done for each patient at their first visit. For treatment, the patients were seated on a special chair containing a magnetic field generator. Pelvic floor muscle stimulation was performed for 20 min (10 min at 5 Hz and 10 min at 50 Hz) twice a week for a total of 8 weeks. The mean follow-up period was 16.8 months (range 12-32 months). A total of 44 patients completed 1 year of follow-up and were re-evaluated by means of voiding diary, pad-weighing test and cystometric study.

RESULTS

Of the 44 patients, 11 (38%) with stress incontinence and 6 (40%) with urge incontinence were cured 1 year after the treatment. In addition, there was an improvement in symptoms in 12 patients (41%) in the stress group and 7 (47%) in the urge group. Pad weight was reduced from 15.4 to 5.8 g in the stress group and from 12.4 to 4.7 g in the urge group (p = 0.000 and 0.001, respectively). Mean Valsalva leak point pressure was increased from 87.3 +/- 15.9 to 118.0 +/- 11.0 cmH (2) O in the stress group (p = 0.000).

CONCLUSIONS

Extracorporeal magnetic stimulation therapy offers a non-invasive, effective and painless treatment for stress and urge incontinence in women.

Sacral neuromodulation with implanted devices for urinary storage and voiding dysfunction in adults

BACKGROUND

The neural control of storage and voiding of urine is complex and dysfunction can be difficult to treat. One treatment for people with refractory symptoms is continuous electrical nerve stimulation of the sacral nerve roots using implanted electrodes and an implanted pulse generator.

OBJECTIVES

To determine the effects of implantable electrical stimulation devices in the treatment of urine storage and voiding problems.

SEARCH STRATEGY

We searched the Cochrane Incontinence Group Specialised Register (searched 10 February 2009), CENTRAL (The Cochrane Library 2008, Issue 1), MEDLINE (January 1980 to March 2008), EMBASE (January 1980 to March 2008), CINAHL (January 1982 to March 2008) and the reference lists of relevant articles.

SELECTION CRITERIA

Trials that tested implanted electronic stimulators connected to electrodes attached to the nerves and providing continuous electrical stimulation for neuromodulation.

DATA COLLECTION AND ANALYSIS

Both authors selected studies, assessed quality, and extracted data.

MAIN RESULTS

Eight reports of randomised studies that evaluated implants which provided continuous stimulation were included. It was unclear whether some reports included patients who also appeared in other reports, so no data were pooled. In spite of this, it seems clear that continuous stimulation offers benefits for carefully selected people with overactive bladder syndrome and for those with urinary retention but no structural obstruction.Many of the implants did not work and many required revision operations. Many questions remain about patient selection and the best way to use these devices.

AUTHORS' CONCLUSIONS

In spite of methodological problems, it would appear that some people benefit from implants which provide continuous nerve stimulation. More research is needed on the best way to improve patient selection, carry out the implant, and to find why so many fail. The effectiveness of implants should be tested against other interventions, particularly in people with an overactive bladder.

Neuromodulation for the treatment of urinary incontinence

Neuromodulation has been reported to be effective for the treatment of stress and urgency urinary incontinence. The cure and improvement rates of pelvic floor neuromodulation in urinary incontinence are 30-50% and 60-90%, respectively. In clinical practice, vaginal, anal and surface electrodes are used for external, short-term stimulation, and sacral nerve stimulation for internal, chronic (long-term) stimulation. The effectiveness of neuromodulation has been verified in a randomized, placebo-controlled study. However, the superiority to other conservative treatments, such as pelvic floor muscle training has not been confirmed. A long-term effect has also been reported. In conclusion, pelvic floor exercise with adjunctive neuromodulation is the mainstay of conservative management for the treatment of stress incontinence. For urgency and mixed stress plus urgency incontinence, neuromodulation may therefore be the treatment of choice as an alternative to drug therapy.

Maximal functional electrical stimulation as a single treatment: is it cost-effective?

OBJECTIVE

The ideal electrical parameters for maximal functional electrical stimulation (MFES) in the treatment of an overactive bladder have not yet been well established. It has been speculated that unsatisfactory results may be due to a low stimulation intensity and that the number of sessions may also be an outcome-determining factor. Herein, we present the results obtained in a group of consecutively treated patients who were given 10 sessions of MFES at the highest tolerable amplitude.

MATERIAL AND METHODS

A total of 60 patients (29 females, 31 males) with an overactive bladder were treated. All subjects underwent a urodynamic assessment and completed a 48-h micturition chart prior to treatment, immediately after the last session and 3 months after termination of treatment. The patients were thoroughly informed that the result of the treatment depended on the amplitude that they could endure; there was a gradual increase in amplitude to the maximum level that did not cause painful discomfort.

RESULTS

Immediately after termination of the stimulation, almost half of the subjects reported an improvement in their condition. However, few subjects experienced sustained symptom amelioration 3 months post-stimulation. Decreases in micturition frequency and the number of leakage episodes were noted immediately after cessation of treatment but these decreases were no longer significant 3 months post-treatment.

CONCLUSIONS

In this series, although MFES was effective in the short term, the long-term treatment outcome was unsatisfactory. A critical review suggests that outcome success is proportional to the patient's ability and willingness to accept quite a high stimulation intensity or, alternatively, follow-up home treatment. Hence, the implementation of strict primary as well as secondary selection criteria can hopefully identify patients most suitable for MFES. Another lesson to be learnt is that the identification of crucial prerequisites of successful treatment is mandatory before embarking on controlled studies.

Randomized, double-blind, sham-controlled evaluation of the effect of functional continuous magnetic stimulation in patients with urgency incontinence

AIMS

To evaluate the effect of functional continuous magnetic stimulation (FCMS) on urgency incontinence in randomized, sham-controlled manner.

METHODS

Thirty-nine patients with urgency incontinence, 16 males and 23 females (aged 66.0 +/- 16.5 years), who were refractory to pelvic floor muscle training (PFMT), were randomly assigned either to the treatment schedule performing 10-week active treatment, followed by 4-week non-treatment interval and then by 10-week sham treatment (A-S, n = 20) or to that performing the sham treatment first followed by 10-week active treatment (S-A, n = 19).

RESULTS

At 10 weeks, the number of leaks/week, the total score of the International Consultation on Incontinence-Questionnaire: Short Form (ICIQ-SF), and maximum cystometric capacity (MCC) were significantly improved as compared with the initial levels (P < 0.001, P < 0.001, and P = 0.003, respectively) in the former group, but not in the latter group. Four (20.0%) patients were cured in the A-S group, while no patient was cured in the S-A group. At the end of the A-S schedule (24 weeks of study), the effect of the active treatment was still maintained at a significantly improved level, as compared with the initial level. At the end of the S-A schedule, the number of leaks/week was significantly improved as compared with the initial level and with its 10-week level (P < 0.001 and P = 0.049, respectively), as well as ICIQ-SF total score (P = 0.001 and P = 0.006, respectively). MCC significantly increased from its initial level (P = 0.030).

CONCLUSION

Magnetic stimulation was effective on urgency incontinence in comparison to sham stimulation in this small patient group.

Functional magnetic stimulation: a new method for the treatment of girls with primary nocturnal enuresis?

OBJECTIVE

The aim of our ongoing study was to evaluate the potential clinical and urodynamic effects of functional magnetic stimulation (FMS) compared to a placebo in the treatment of girls with primary nocturnal enuresis (PNE).

PATIENTS AND METHODS

Twenty girls with PNE (mean age 10.8 years, range 6-14 years) were included in the study and randomly divided into two groups, the active FMS group (10 girls) and the placebo group (10 girls). All girls were asked to wear Pulsegen stimulators day and night for 2 months. FMS was applied continuously at 18.5 Hz. Clinical parameters were documented and urodynamic evaluation was performed before and after FMS. Data were analyzed using non-parametric statistics.

RESULTS

The number of weekly PNE episodes decreased significantly after FMS compared to the placebo (P=0.007). In the active group the number of PNE episodes fell from 3.1 to 1.3 per week (P=0.028). Three girls from the active group were completely dry and four were significantly improved. In the FMS group a significant (P=0.022) increase in bladder volume at the strong desire to void was observed. Also, an increase in bladder volume at the first desire to void was observed, although this was not statistically significant (P=0.059).

CONCLUSION

According to the preliminary results of our study, FMS represents a promising new method for the treatment of girls with PNE.

Modeling electromagnetic fields detectability in a HH-like neuronal system: stochastic resonance and window behavior

Noise has already been shown to play a constructive role in neuronal processing and reliability, according to stochastic resonance (SR). Here another issue is addressed, concerning noise role in the detectability of an exogenous signal, here representing an electromagnetic (EM) field. A Hodgkin-Huxley like neuronal model describing a myelinated nerve fiber is proposed and validated, excited with a suprathreshold stimulation. EM field is introduced as an additive voltage input and its detectability in neuronal response is evaluated in terms of the output signal-to-noise ratio. Noise intensities maximizing spiking activity coherence with the exogenous EM signal are clearly shown, indicating a stochastic resonant behavior, strictly connected to the model frequency sensitivity. In this study SR exhibits a window of occurrence in the values of field frequency and intensity, which is a kind of effect long reported in bioelectromagnetic experimental studies. The spatial distribution of the modeled structure also allows to investigate possible effects on action potentials saltatory propagation, which results to be reliable and robust over the presence of an exogenous EM field and biological noise. The proposed approach can be seen as assessing biophysical bases of medical applications funded on electric and magnetic stimulation where the role of noise as a cooperative factor has recently gained growing attention.

Short-term effects of magnetic sacral dermatome stimulation for idiopathic slow transit constipation: sham-controlled, cross-over pilot study

BACKGROUND AND AIM

An increase in recto-sigmoid colon activity through electrical stimulation of the sacral dermatomes has previously been reported. It has not been evaluated whether or not sacral dermatome stimulation has beneficial effects on constipation symptoms and anorectal function in constipated patients. Our aim was to evaluate short-term effects of magnetic stimulation of the sacral dermatomes on constipation symptoms and anorectal function in patients with idiopathic slow transit constipation.

METHOD

Fourteen patients with idiopathic slow transit constipation were enrolled. Constipation symptoms, stool form and anorectal function were assessed before treatment, and at 3 and 6 weeks of treatment. Six-week treatment consisted of either a 3-week period of sham treatment or a 3-week period of magnetic stimulation of the S2-S3 dermatomes, which was performed in a randomized cross-over design.

RESULTS

During the stimulation period, the frequency score of spontaneous bowel movements decreased in eight of the 14 patients (2.9 [2-3]vs 1.4 [0-2]), whose threshold volumes for urge to defecate and maximum tolerable volumes were significantly greater than those of the non-responders, and significantly decreased at the end of treatment. The degree of straining on defecation also significantly decreased in the responders. Responders had shorter right colonic transit time and longer left colonic transit time compared to the non-responders. Sham treatment did not affect constipation symptoms, stool form and rectal sensation.

CONCLUSION

Sacral dermatome stimulation may offer potential for therapeutic benefit for a subset of patients with idiopathic slow transit constipation, particularly constipated patients with rectal hyposensation or hindgut dysfunction.

A critical review on magnetic stimulation: what is its role in the management of pelvic floor disorders?

PURPOSE OF REVIEW

This review looks at the acute effects of magnetic stimulation on urodynamic parameters and reviews the data on its use in the management of urinary incontinence.

RECENT FINDINGS

Reported cure rates for stress incontinence immediately after a course of perineal magnetic stimulation range from 12.5 to 52.9% with good improvement occurring in 32% to 41%. However the effect seems temporary and dependent on the number of sessions. Sacral and pelvic floor magnetic stimulation have also been shown to increase cystometric capacity, inhibit detrusor overactivity and resolve overactive bladder symptoms acutely. Persistence of this effect with symptomatic improvement one week after sacral magnetic stimulation has been demonstrated. How magnetic stimulation suppresses detrusor contraction is not known. Prospective trials with the Neocontrol chair (Neotonus Inc, Marietta, Georgia, USA) also showed symptomatic improvement in 71 to 87% in the short term. However, the longer term data appear mixed.

SUMMARY

Overall, the data available vary too much in terms of treatment protocols, patient mix and symptom severity to determine which group of patients might benefit most and what the optimal stimulation parameters are for each condition. Mean reductions in leak parameters, although statistically significant, may not always be clinically satisfactory. The beneficial effects also appear to be temporary and continuous treatment will probably be required. Further trials are needed to determine the optimum stimulation protocols for different situations and to compare magnetic stimulation with other forms of conservative pelvic floor therapy.

Functional magnetic stimulation for mixed urinary incontinence

PURPOSE

In this study we determined the efficacy of functional magnetic stimulation (FMS) compared to placebo for treating women with mixed urinary incontinence (MUI).

MATERIALS AND METHODS

A total of 39 women with MUI were randomly assigned to the FMS group (23 patients) or to the placebo group (16 patients). FMS was applied continuously at 18.5 Hz day and night for 2 months. Conventional urodynamic studies were performed before and after stimulation. Outcome measures assessed were clinical (daytime frequency, nocturia, pad use, pad weight) and urodynamic variables (first sensation of bladder filling, maximum cystometric capacity, maximum urethral closure pressure), and patient subjective assessment (visual analogue scale).

RESULTS

After 2 months of FMS significant decreases in voiding frequency (from 9.0 to 6.7, p = 0.0002), nocturia (from 2.6 to 1.4, p = 0.0007) and pad use (from 3.9 to 2.2, p = 0.007) were observed only in the FMS group. First sensation of bladder filling and maximum cystometric capacity increased significantly after stimulation compared with prestimulation levels only in the FMS group, p = 0.003 (from 118 to 174 ml) and p = 0.00004 (from 267 to 396 ml), respectively. A total of 18 women (78.3%) reported an improvement in symptoms after FMS with an average success rate of 41.9%. The success rate was significantly lower in the placebo group (p = 0.021) at 22.9%.

CONCLUSIONS

Functional magnetic stimulation was useful and safe for treating women with MUI.

Artificial autonomic reflexes: using functional electrical stimulation to mimic bladder reflexes after injury or disease

Autonomic reflexes controlling bladder storage (continence) and emptying (micturition) involve spinal and supraspinal nerve pathways, with complex mechanisms coordinating smooth muscle activity of the lower urinary tract with voluntary muscle activity of the external urethral sphincter (EUS). These reflexes can be severely disrupted by various diseases and by neurotrauma, particularly spinal cord injury (SCI). Functional electrical stimulation (FES) refers to a group of techniques that involve application of low levels of electrical current to artificially induce or modify nerve activation or muscle contraction, in order to restore function, improve health or rectify physiological dysfunction. Various types of FES have been developed specifically for improving bladder function and while successful for many urological patients, still require substantial refinement for use after spinal cord injury. Improved knowledge of the neural circuitry and physiology of human bladder reflexes, and the mechanisms by which various types of FES alter spinal outflow, is urgently required. Following spinal cord injury, physical and chemical changes occur within peripheral, spinal and supraspinal components of bladder reflex circuitry. Better understanding of this plasticity may determine the most suitable methods of FES at particular times after injury, or may lead to new FES approaches that exploit this remodeling or perhaps even influence the plasticity. Advances in studies of the neuroanatomy, neurophysiology and plasticity of lumbosacral nerve circuits will provide many further opportunities to improve FES approaches, and will provide "artificial autonomic reflexes" that much more closely resemble the original, healthy neuronal regulatory mechanisms.

URODYNAMIC AND CLINICAL EVALUATION OF 91 FEMALE PATIENTS WITH URINARY INCONTINENCE TREATED WITH PERINEAL MAGNETIC STIMULATION: 1-YEAR FOLLOWUP

PURPOSE

We evaluate the perineal magnetic stimulation (PMS) effect on continence and quality of life in women with urinary incontinence.

MATERIALS AND METHODS

We prospective studied 91 women with demonstrable urinary incontinence treated with 16 sessions of PMS. Pretreatment and posttreatment evaluation was done by clinical history, physical examination, voiding diary, validated quality of life survey (I-QOL) and urodynamic study (UDS). Patients with no leakage after treatment were evaluated at 3, 6 and 12 months.

RESULTS

Mean patient age +/- SD was 60.5 +/- 10.1 years. Immediately after treatment the I-QOL score increased 35% (p <0.001), the number of pads daily decreased 40% (p <0.001), the number of leaks daily decreased 54% (p <0.001) and 34 patients (37%) became dry. Of the 91 patients 41 were evaluated before and after treatment by UDS. The average increase in vesical leak point pressure (VLPP) was 24.3% (p = 0.001) and initial VLPP in patients who became dry was greater than 80 cm H2O. After treatment 77% of patients with initial low pressure detrusor overactivity on UDS became free of this condition. One year after discontinuing PMS 94% of patients who became dry immediately after treatment had recurrence.

CONCLUSIONS

Immediately after 16 sessions of PMS women with urinary incontinence have significant improvement in the I-QOL score with decreased daily pad use and leakage episodes but 63% had failure. Therapy is more effective in patients with a VLPP of greater than 80 cm H2O. The beneficial effect is temporary with high and early recurrence after discontinuing treatment.

Functional extracorporeal magnetic stimulation as a treatment for female urinary incontinence: 'the chair'

OBJECTIVE

To evaluate, in a prospective study, the efficiency and applicability of functional magnetic stimulation (FMS) of the pelvic floor for treating urinary incontinence in women.

PATIENTS AND METHODS

FMS was provided by a 'magnetic chair'; 24 patients were treated twice weekly for 8 weeks (12 with urge incontinence and 12 with a mixture of urge and stress incontinence). The outcome was assessed urodynamically, by a pad test, and by patient satisfaction.

RESULTS

In 58% of the patients there was an objective improvement in incontinence; three patients were completely dry and 71% reported a subjective improvement (P < 0.001).

CONCLUSION

FMS is a safe, noninvasive and painless treatment for urinary incontinence; it is effective and easy to administer as an outpatient treatment.

Functional magnetic stimulation of the spinal cord?a urodynamic study in healthy humans

AIMS

To study the effects of functional magnetic stimulation of the spinal cord in healthy subjects on somatic and autonomic pathways innervating the anal and the external urethral sphincter, bladder, bladder neck, and rectum.

METHODS

Eight healthy male volunteers gave their written informed consent and underwent functional magnetic stimulation of the thoracolumbar and sacral spinal cord. A two-channel microtip pressure transducer catheter was placed rectally measuring the abdominal and anal sphincter pressure. A three-channel microtip pressure transducer catheter was inserted into the urethra measuring the bladder, the bladder neck, and the external urethral sphincter pressure. A comprehensive protocol of single and repetitive magnetic stimulations was performed. Frequency, location, and duration of stimulation were varied while the intensity of stimulation was adapted to the maximum the subjects could tolerate. In four subjects, the degree of bladder filling was changed and the protocol was repeated when the subjects reported a full bladder and desire to void.

RESULTS

Continuous magnetic stimulation of the thoracolumbar spinal cord and the sacral roots applied with different frequencies (5, 15, 30, 60, 100 Hz) and different duration of stimulation (10, 30, 120 sec) evoked sphincter contraction of both anal and urethral sphincters. The stimulation could not evoke contractions of the bladder, the bladder neck, or the rectum. Also with filled bladder and present desire to void, the magnetic stimulation could not activate autonomic pathways innervating these structures.

CONCLUSIONS

Considering our results, we suggest that in individuals with preserved sensibility magnetic stimulation of the spinal cord with intensities below the pain threshold is ineffective in activating autonomic nerve fibres innervating bladder, bladder neck, and rectum.

Analysis of efficiency of magnetic stimulation

Magnetic stimulation can activate excitable tissues noninvasively. However, this method requires high energy to operate and can produce equipment heat that leads to inefficient stimulation. In this study, a comprehensive optimization of efficiency for magnetic stimulation has been conducted. A total of 16 781 coil designs were tested in order to determine the optimal coil geometry and inductance for neural excitation. Induced electric fields were calculated to find the optimal stimulation site (OSS) of a given coil. The threshold energy of a magnetic pulse for neural excitation was then calculated based on the transmembrane responses of a nerve model. Simulation results show that there exists an optimal inductance, as a consequence of an optimal pulse duration, corresponding to a minimum threshold energy. A longer pulse width is required to obtain the maximum efficiency for axons with slower membrane dynamics, a longer coil-to-fiber distance, and greater values of resistance (R) and capacitance (C) of the resistance-inductance-capacitance circuit. The optimal geometry features a minimum coil height, suggesting a flat coil design for optimal efficiency. The dimension of the optimal coil design increases with the coil-to-fiber distance. Moreover, the cloverleaf design achieves the highest efficiency for infinitely long fibers whereas the butterfly design is optimal for terminating or bending fibers.

Overactive bladder: magnetic versus electrical stimulation

PURPOSE OF REVIEW

To review recent literature on the electrical and magnetic stimulation of the sacral nerve roots and pelvic floor for the treatment of overactive bladder.

RECENT FINDINGS

Overactive bladder is a common condition affecting millions of women worldwide, with a significant effect on quality of life. Electrical stimulation and neuromodulation of the sacral nerve roots have provided a useful alternative for these patients with satisfactory outcomes. The use of the procedures has been limited, however, mainly due to local discomfort/pain or invasiveness of the surgical procedure. Magnetic stimulation can activate deep neural structures by induced electric currents noninvasively. Recent investigations demonstrated that magnetic stimulation of the sacral roots suppressed detrusor overactivity more effectively compared with electrical stimulation. Clinical trials including randomized placebo-controlled studies demonstrated the excellent short-term effect of magnetic stimulation in the treatment of overactive bladder.

SUMMARY

Magnetic stimulation appears to induce inhibitory effects on detrusor overactivity in a similar manner to electrical stimulation, with significant clinical advantages. Although further studies are needed to establish long-term efficacy, magnetic stimulation of the sacral nerve roots may be a promising alternative treatment for overactive bladder.