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Yang Y, Wang J, Wang L, Wu Q, Ling L, Yang Y, Ning S, Xie Y, Cao Q, Li L, Liu J, Ling Q, Zang J. Magnetic soft robotic bladder for assisted urination. SCIENCE ADVANCES 2022; 8:eabq1456. [PMID: 36001667 PMCID: PMC9401625 DOI: 10.1126/sciadv.abq1456] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Accepted: 07/12/2022] [Indexed: 06/15/2023]
Abstract
The poor contractility of the detrusor muscle in underactive bladders (UABs) fails to increase the pressure inside the UAB, leading to strenuous and incomplete urination. However, existing therapeutic strategies by modulating/repairing detrusor muscles, e.g., neurostimulation and regenerative medicine, still have low efficacy and/or adverse effects. Here, we present an implantable magnetic soft robotic bladder (MRB) that can directly apply mechanical compression to the UAB to assist urination. Composed of a biocompatible elastomer composite with optimized magnetic domains, the MRB enables on-demand contraction of the UAB when actuated by magnetic fields. A representative MRB for a UAB in a porcine model is demonstrated, and MRB-assisted urination is validated by in situ computed tomography imaging after 14-day implantation. The urodynamic tests show a series of successful urination with a high pressure increase and fast urine flow. Our work paves the way for developing MRB to assist urination for humans with UABs.
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Affiliation(s)
- Youzhou Yang
- Department of Urology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, PR China
- School of Optical and Electronic Information and Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - Jiaxin Wang
- Department of Urology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, PR China
- Institute of Urology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, PR China
| | - Liu Wang
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei 230026, PR China
| | - Qingyang Wu
- School of Optical and Electronic Information and Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - Le Ling
- Department of Urology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, PR China
- Institute of Urology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, PR China
| | - Yueying Yang
- School of Optical and Electronic Information and Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - Shan Ning
- School of Optical and Electronic Information and Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - Yan Xie
- Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, PR China
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - Quanliang Cao
- Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, PR China
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - Liang Li
- Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, PR China
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - Jihong Liu
- Department of Urology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, PR China
- Institute of Urology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, PR China
| | - Qing Ling
- Department of Urology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, PR China
- Institute of Urology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, PR China
| | - Jianfeng Zang
- School of Optical and Electronic Information and Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, PR China
- The State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science and Technology, Wuhan 430074, PR China
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Affiliation(s)
- Bermans J Iskandar
- From the Department of Neurological Surgery, University of Wisconsin-Madison, Madison (B.J.I.); and the Departments of Molecular and Human Genetics, Molecular and Cellular Biology, and Medicine, Baylor College of Medicine, Houston (R.H.F.)
| | - Richard H Finnell
- From the Department of Neurological Surgery, University of Wisconsin-Madison, Madison (B.J.I.); and the Departments of Molecular and Human Genetics, Molecular and Cellular Biology, and Medicine, Baylor College of Medicine, Houston (R.H.F.)
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Pediatric Neurogenic Bladder and Bowel Dysfunction: Will My Child Ever Be out of Diapers? Eur Urol Focus 2020; 6:838-867. [PMID: 31982364 DOI: 10.1016/j.euf.2020.01.003] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2019] [Revised: 12/02/2019] [Accepted: 01/13/2020] [Indexed: 02/07/2023]
Abstract
CONTEXT Managing patient and parent expectations regarding urinary and fecal continence is important with congenital conditions that produce neurogenic bladder and bowel dysfunction. Physicians need to be aware of common treatment algorithms and expected outcomes to best counsel these families. OBJECTIVE To systematically evaluate evidence regarding the utilization and success of various modalities in achieving continence, as well as related outcomes, in children with neurogenic bladder and bowel dysfunction. EVIDENCE ACQUISITION We performed a systematic review of the literature in PubMed/Medline in August 2019. A total of 114 publications were included in the analysis, including 49 for bladder management and 65 for bowel management. EVIDENCE SYNTHESIS Children with neurogenic bladder conditions achieved urinary continence 50% of the time, including 44% of children treated with nonsurgical methods and 64% with surgical interventions. Patients with neurogenic bowel problems achieved fecal continence 75% of the time, including 78% of patients treated with nonsurgical methods and 73% with surgical treatment. Surgical complications and need for revisions were high in both categories. CONCLUSIONS Approximately half of children with neurogenic bladder dysfunction will achieve urinary continence and about three-quarters of children with neurogenic bowel dysfunction will become fecally continent. Surgical intervention can be successful in patients refractory to nonsurgical management, but the high complication and revision rates support their use as second-line therapy. This is consistent with guidelines issued by the International Children's Continence Society. PATIENT SUMMARY Approximately half of children with neurogenic bladder dysfunction will achieve urinary continence, and about three-quarters of children with neurogenic bowel dysfunction will become fecally continent. Most children can be managed without surgery. Patients who do not achieve continence with nonsurgical methods frequently have success with operative procedures, but complications and requirements for additional procedures must be expected.
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Efficacy and safety of mirabegron, a β3-adrenoceptor agonist, for treating neurogenic bladder in pediatric patients with spina bifida: a retrospective pilot study. World J Urol 2018; 37:1665-1670. [DOI: 10.1007/s00345-018-2576-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Accepted: 11/22/2018] [Indexed: 12/27/2022] Open
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Deng Y, Dong Y, Liu Y, Zhang Q, Guan X, Chen X, Li M, Xu L, Yang C. A systematic review of clinical studies on electrical stimulation therapy for patients with neurogenic bowel dysfunction after spinal cord injury. Medicine (Baltimore) 2018; 97:e12778. [PMID: 30313096 PMCID: PMC6203582 DOI: 10.1097/md.0000000000012778] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
BACKGROUND This study aimed to perform a systematic literature review of the clinical trial evidence on electrical stimulation for the treatment of neurogenic bowel dysfunction (NBD) after spinal cord injury (SCI). METHODS Systematic electronic searches were carried out in the PubMed/Medline, EMBASE, Cochrane Central Register of Controlled Trials, and China National Knowledge Infrastructure databases, along with the reference lists in the include studies. Studies were eligible for inclusion if they adopted a controlled clinical design based on human population, the patients suffered from spinal cord injury, the main outcomes were the disorders of bowel function and the intervention was electrical stimulation. Also, the language was limited to English and Chinese. RESULTS Eleven studies were included in this systematic review, comprising transcutaneous electrical stimulation, transrectal bowel stimulation, sacral nerve stimulation, intravesical electrical stimulation, etc. Of the 11 studies, 3 were randomized controlled trials, 8 were controlled before-and-after trials. The quality of the included studies was moderate bias risk. Most studies revealed that the electrical stimulation was beneficial for the patient with NBD after SCI. CONCLUSIONS Only 11 small clinical studies with 298 participants have evaluated the efficacy of electrical stimulation for NBD after SCI. Although some studies showed electrical stimulation was benefit for the patient with NBD after SCI, there was currently not enough evidence to support the use of electrical stimulation could improve the clinical symptoms of those patients. Thus, well-designed randomized controlled trials with larger patient population are warranted to establish its benefit in clinical practice in the future.
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Affiliation(s)
- Yuling Deng
- Department of Chinese Medicine Rehabilitation, Pingxiang People's Hospital, Jiangxi
| | - Yonghai Dong
- Jiangxi Provincial Center for Disease Control and Prevention
| | - Yun Liu
- Cadre Wards of Neurology Medicine
| | | | - Xihong Guan
- Remote Diagnosis Center, Jiangxi Provincial People's Hospital
| | - Xiaodan Chen
- Jiangxi Provincial Cancer Hospital, Nanchang, P.R. China
| | - Meng Li
- Jiangxi Provincial Center for Disease Control and Prevention
| | - Lei Xu
- Jiangxi Provincial Center for Disease Control and Prevention
| | - Cheng Yang
- Jiangxi Provincial Center for Disease Control and Prevention
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Yune JJ, Shen JK, Pierce MA, Hardesty JS, Kim J, Siddighi S. Intravesical electrical stimulation treatment for overactive bladder: An observational study. Investig Clin Urol 2018; 59:246-251. [PMID: 29984339 PMCID: PMC6028462 DOI: 10.4111/icu.2018.59.4.246] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Accepted: 06/07/2018] [Indexed: 01/01/2023] Open
Abstract
Purpose Intravesical electrical stimulation treatment (IVES) has been successfully used to treat neurogenic bladder. We report the results of an observational study regarding the use of IVES for women with overactive bladder syndrome (OAB) and/or urgency urinary incontinence (UUI). Materials and Methods IVES was performed in women with OAB (defined by frequency ≥8/day, nocturia ≥2/night, or ≥3 episodes of UUI on 3-day voiding diary) who failed prior medical therapy. Subjects underwent 4 weeks of treatment with an 8-Fr Detruset™ IVES catheter. Primary outcome was Patient Global Impression of Improvement (PGI-I) at 3 months. Secondary outcomes included Visual Analog Scale (VAS), Short Form OAB Questionnaire (OAB-q SF), Pelvic Floor Distress Inventory (PFDI), Pelvic Floor Impact Questionnaire (PFIQ), reduction in frequency and UUI on voiding diary, and adverse effects. Analysis was done with paired t-tests and Wilcoxon signed rank tests. Results Seventeen subjects completed the study. At 4 weeks post-treatment, 15 improved on PGI-I (11 subjects: ‘a little better’, 2: ‘much better’, 2: ‘very much better’). There were significant improvements in symptom bother and health-related quality of life as measured by OAB-q SF and pelvic organ prolapse and urinary distress as measured by PFDI. Frequency decreased from 10.3±4.3 at baseline to 8.9±2.3 (p=0.04) at 3 months. No pain was reported during treatment. There was one urinary tract infection during the study period. No other adverse events were reported. Conclusions IVES appears to be a safe and effective novel treatment for OAB. Larger comparative studies are needed to investigate its potential for long-term treatment.
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Affiliation(s)
- J Joshua Yune
- Department of Urology, Loma Linda University Medical Center, Loma Linda, CA, USA
| | - Jim K Shen
- Department of Urology, Loma Linda University Medical Center, Loma Linda, CA, USA
| | - Matthew A Pierce
- Department of Urology, Loma Linda University Medical Center, Loma Linda, CA, USA
| | - Jeffrey S Hardesty
- Division of Female Pelvic Medicine and Reconstructive Surgery, Department of Gynecology and Obstetrics, Loma Linda University Medical Center, Loma Linda University, Loma Linda, CA, USA
| | - Joo Kim
- Department of Public Health, Loma Linda University, Loma Linda, CA, USA
| | - Sam Siddighi
- Division of Female Pelvic Medicine and Reconstructive Surgery, Department of Gynecology and Obstetrics, Loma Linda University Medical Center, Loma Linda University, Loma Linda, CA, USA
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Deng H, Liao L, Wu J, Chen G, Li X, Wang Z, Wan L. Clinical efficacy of intravesical electrical stimulation on detrusor underactivity: 8 Years of experience from a single center. Medicine (Baltimore) 2017; 96:e8020. [PMID: 28930838 PMCID: PMC5617705 DOI: 10.1097/md.0000000000008020] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
The aim of this study was to retrospectively evaluate the effectiveness of intravesical electrical stimulation (IVES) on detrusor underactivity (DU).From 2009 to 2016, a total of 105 patients with symptoms of DU who were treated with IVES were included in this retrospective study. The medical records, physical examination findings, urine culture results, and video-urodynamic studies were reviewed. Changes in post-void residual urine (PVR) and voiding efficiency (VE) were included for evaluation of efficacy. Patients achieving a >50% reduction in the PVR were regarded as responders. A >80% reduction in the PVR was considered obvious improvement. A questionnaire was administered to patients with bladder sensation.Of the 105 patients, the information of residual urine volume and voiding volume was obtained in 89 patients, and detailed pre- and post-IVES bladder sensation information was available on 96 patients. Of the 89 patients, 47.2% (42/89) were responders and achieved a >50% reduction in the PVR. Obvious improvement in the PVR, defined as a >80% reduction, occurred in 27% (24/89) of the patients. VE developed in 76.4% (68/89) of the patients, and 30.3% (27/89) of the patients increased >50%. Significant improvements in the PVR and VE were observed during IVES treatment (P < .05). Based on the questionnaire, bladder sensation developed and was sustained in 44.8% (43/96) of the patients.IVES provides a promising method for improving the PVR and VE in a majority of patients with DU. Thus, IVES is worth to further study and carry out.
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Affiliation(s)
- Han Deng
- Department of Urology, China Rehabilitation Research Centre, Rehabilitation School of Capital Medical University
- Center of Neural Injury and Repair, Beijing Institute for Brain Disorders
- Beijing Key Laboratory of Neural Injury and Rehabilitation, Beijing, China
| | - Limin Liao
- Department of Urology, China Rehabilitation Research Centre, Rehabilitation School of Capital Medical University
- Center of Neural Injury and Repair, Beijing Institute for Brain Disorders
- Beijing Key Laboratory of Neural Injury and Rehabilitation, Beijing, China
| | - Juan Wu
- Department of Urology, China Rehabilitation Research Centre, Rehabilitation School of Capital Medical University
- Center of Neural Injury and Repair, Beijing Institute for Brain Disorders
- Beijing Key Laboratory of Neural Injury and Rehabilitation, Beijing, China
| | - Guoqing Chen
- Department of Urology, China Rehabilitation Research Centre, Rehabilitation School of Capital Medical University
- Center of Neural Injury and Repair, Beijing Institute for Brain Disorders
- Beijing Key Laboratory of Neural Injury and Rehabilitation, Beijing, China
| | - Xing Li
- Department of Urology, China Rehabilitation Research Centre, Rehabilitation School of Capital Medical University
- Center of Neural Injury and Repair, Beijing Institute for Brain Disorders
- Beijing Key Laboratory of Neural Injury and Rehabilitation, Beijing, China
| | - Zhaoxia Wang
- Department of Urology, China Rehabilitation Research Centre, Rehabilitation School of Capital Medical University
- Center of Neural Injury and Repair, Beijing Institute for Brain Disorders
- Beijing Key Laboratory of Neural Injury and Rehabilitation, Beijing, China
| | - Li Wan
- Department of Urology, China Rehabilitation Research Centre, Rehabilitation School of Capital Medical University
- Center of Neural Injury and Repair, Beijing Institute for Brain Disorders
- Beijing Key Laboratory of Neural Injury and Rehabilitation, Beijing, China
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Joussain C, Denys P. Electrical management of neurogenic lower urinary tract disorders. Ann Phys Rehabil Med 2015; 58:245-250. [PMID: 26321622 DOI: 10.1016/j.rehab.2015.07.005] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2015] [Revised: 07/07/2015] [Accepted: 07/07/2015] [Indexed: 11/16/2022]
Abstract
Management of lower urinary tract dysfunction (LUTD) in neurological diseases remains a priority because it leads to many complications such as incontinence, renal failure and decreased quality of life. A pharmacological approach remains the first-line treatment for patients with neurogenic LUTD, but electrical stimulation is a well-validated and recommended second-line treatment. However, clinicians must be aware of the indications, advantages and side effects of the therapy. This report provides an update on the 2 main electrical stimulation therapies for neurogenic LUTD - inducing direct bladder contraction with the Brindley procedure and modulating LUT physiology (sacral neuromodulation, tibial posterior nerve stimulation or pudendal nerve stimulation). We also describe the indications of these therapies for neurogenic LUTD, following international guidelines, as illustrated by their efficacy in patients with neurologic disorders. Electrical stimulation could be proposed for neurogenic LUTD as second-line treatment after failure of oral pharmacologic approaches. Nevertheless, further investigations are needed for a better understanding of the mechanisms of action of these techniques and to confirm their efficacy. Other electrical investigations, such as deep-brain stimulation and repetitive transcranial magnetic stimulation, or improved sacral anterior root stimulation, which could be associated with non-invasive and highly specific deafferentation of posterior roots, may open new fields in the management of neurogenic LUTD.
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Affiliation(s)
- C Joussain
- Medical School Paris Île-de-France Ouest, Inserm U1179, Versailles Saint-Quentin University, Versailles, France.
| | - P Denys
- Department of Physical Medicine and Rehabilitation, Raymond-Poincaré Hospital, Medical School Paris Île-de-France Ouest, Inserm U1179 Versailles Saint-Quentin University, Versailles, France
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Kajbafzadeh AM, Sharifi-Rad L, Ladi-Seyedian SS, Mozafarpour S. Transcutaneous interferential electrical stimulation for the management of non-neuropathic underactive bladder in children: a randomised clinical trial. BJU Int 2015; 117:793-800. [PMID: 26086897 DOI: 10.1111/bju.13207] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
OBJECTIVES To assess the efficacy of transcutaneous interferential electrical stimulation (IFES) and urotherapy in the management of non-neuropathic underactive bladder (UAB) in children with voiding dysfunction. PATIENTS AND METHODS In all, 36 children with UAB without neuropathic disease [15 boys, 21 girls; mean (sd) age 8.9 (2.6) years] were enrolled and then randomly allocated to two equal treatment groups comprising IFES and control groups. The control group underwent only standard urotherapy comprising diet, hydration, scheduled voiding, toilet training, and pelvic floor and abdominal muscles relaxation. Children in the IFES group likewise underwent standard urotherapy and also received IFES. Children in both groups underwent a 15-session treatment programme twice a week. A complete voiding and bowel habit diary was completed by parents before, after treatment, and 1 year later. Bladder ultrasound and uroflowmetry/electromyography were performed before, at the end of treatment course, and at the 1-year follow-up. RESULTS The mean (sd) number of voiding episodes before treatment was 2.6 (1) and 2.7 (0.76) times/day in the IFES and control groups, respectively, which significantly increased after IFES therapy in IFES group, compared with only standard urotherapy in the control group [6.3 (1.4) vs 4.7 (1.3) times/day, P < 0.002). The mean (sd) bladder capacity before treatment was 424 (123) and 463 (121) mL in the control and IFES groups, respectively, which decreased significantly at 1 year after treatment in the IFES group compared with the controls, at 227 (86) vs 344 (127) mL (P < 0.01). Maximum urine flow increased and voiding time decreased significantly in the IFES group compared with controls at the end of treatment sessions and 1 year later (P < 0.05). All the children had abnormal flow curves at the beginning of the study. The flow curve became normal in 14/18 (77%) of the children in the IFES group and six of 18 (33%) in the control group by the end of follow-up (P < 0.007). At the end of the treatment course, night-time wetting was improved in all children who had this symptom before the treatment in the IFES group (P < 0.01). CONCLUSION Combining IFES and urotherapy is a safe and effective therapy in the management of children with UAB.
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Affiliation(s)
- Abdol-Mohammad Kajbafzadeh
- Department of Pediatric Urology, Pediatric Urology Research Center, Children's Hospital Medical Center, Pediatric Center of Excellence, Tehran University of Medical Sciences, Tehran, Iran
| | - Lida Sharifi-Rad
- Department of Physical Therapy, Children's Hospital Medical Center, Pediatric Center of Excellence, Tehran University of Medical Sciences, Tehran, Iran
| | - Seyedeh-Sanam Ladi-Seyedian
- Department of Pediatric Urology, Pediatric Urology Research Center, Children's Hospital Medical Center, Pediatric Center of Excellence, Tehran University of Medical Sciences, Tehran, Iran
| | - Sarah Mozafarpour
- Department of Pediatric Urology, Pediatric Urology Research Center, Children's Hospital Medical Center, Pediatric Center of Excellence, Tehran University of Medical Sciences, Tehran, Iran
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Drake MJ, Williams J, Bijos DA. Voiding dysfunction due to detrusor underactivity: an overview. Nat Rev Urol 2014; 11:454-64. [PMID: 25002201 DOI: 10.1038/nrurol.2014.156] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Detrusor underactivity (DUA) is defined as a voiding contraction of reduced strength and/or duration, which prolongs urination and/or prevents complete emptying of the bladder within a 'normal' period of time. This issue is associated with voiding and postmicturition urinary symptoms, and can predispose to urinary infections and acute urinary retention. The aetiology of DUA is influenced by multiple factors, including ageing, bladder outlet obstruction, neurological disease, and autonomic denervation. The true prevalence of this condition remains unknown, as most data come from referral populations. Urodynamic testing is used to diagnose the condition, either by assessing the relationship between bladder pressures and urinary flow, or by interrupting voiding to measure detrusor pressure change under isovolumetric conditions. Current treatments for DUA have poor efficacy and tolerability, and often fail to improve quality of life; muscarinic receptor agonists, in particular, have limited efficacy and frequent adverse effects. Bladder emptying might be achieved through Valsalva straining, and intermittent or indwelling catheterization, although sacral nerve stimulation can reduce dependency on catheterization. Novel stem-cell-based therapies have been attempted; however, new drugs that increase contractility are currently largely conceptual, and the complex pathophysiology of DUA, difficulty achieving organ specificity of treatment, the limited availability of animal models, and the subjective nature of current outcome measures must be addressed to facilitate the development of such agents.
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Affiliation(s)
- Marcus J Drake
- Urology Department, University of Bristol and Bristol Urological Institute, Southmead Hospital, Bristol, Avon BS10 5NB, UK
| | - Jonathan Williams
- Urology Department, University of Bristol and Bristol Urological Institute, Southmead Hospital, Bristol, Avon BS10 5NB, UK
| | - Dominika A Bijos
- Urology Department, University of Bristol and Bristol Urological Institute, Southmead Hospital, Bristol, Avon BS10 5NB, UK
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