Paeds · nephrology-urology-fluids-and-electrolytes
Neurogenic bladder and dysfunctional voiding
Also known as Neuropathic bladder · Neurogenic lower urinary tract dysfunction · Detrusor-sphincter dyssynergia · Overactive bladder in children · Voiding dysfunction · Dysfunctional elimination syndrome
Fellowship guide to the neurogenic bladder and the dysfunctional voiding spectrum in children. Covers the neurological control of micturition and how a cord lesion such as spina bifida produces a hostile high-pressure bladder that threatens the upper tracts, the distinction from functional overactive bladder and dysfunctional voiding, the role of video-urodynamics, and the stepwise management from clean intermittent catheterisation and anticholinergics through intravesical botulinum toxin to bladder augmentation and a continent catheterisable channel, with the explicit goal of protecting renal function.
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Target exams
Red flags
- An infant with myelomeningocele whose urodynamics show a hostile high-pressure bladder with a detrusor leak point pressure above 40 cm of water, predicting upper-tract damage
- A child with a neurogenic bladder presenting with urosepsis, a palpable bladder, and urinary retention needing immediate catheter drainage
- Progressive hydronephrosis or new vesicoureteral reflux on surveillance ultrasound of a child with a neurogenic bladder signalling rising storage pressures
- Daytime incontinence, constipation, and a staccato stream in a school-age child with an undiagnosed occult spinal dysraphism such as a tethered cord
- Recurrent febrile urinary tract infection with renal scarring and a rising creatinine in a child with a poorly compliant valve bladder
- Haematuria or a bladder mass in an adult with spina bifida raising concern for bladder cancer, a recognised long-term complication
Life stages
Care settings
Clinical exam formats
Board mappings
- Defines a neurogenic bladder as disordered bladder storage or emptying caused by a congenital or acquired neurological lesion, most often spinal dysraphism
- Distinguishes neurogenic bladder from dysfunctional voiding and overactive bladder, which are functional disorders with no cord lesion
- Recognises that a neuropathic bladder threatens the upper tracts through high storage pressures and initiates clean intermittent catheterisation and anticholinergic therapy
- Classifies neurogenic bladder into detrusor overactivity, detrusor-sphincter dyssynergia, and impaired compliance, and relates each to the level of the cord lesion
- Interprets video-urodynamics and applies the ICCS diagnostic pathway for congenital neuropathic bladder and bowel dysfunction
- Constructs a stepwise management plan from clean intermittent catheterisation and anticholinergics through intravesical botulinum toxin to bladder augmentation, with the goal of protecting renal function
- Neurogenic bladder in spinal dysraphism and the rationale for early urodynamic surveillance in infancy
- The dysfunctional voiding and overactive bladder spectrum and the role of uroflowmetry and bladder diary
- Clean intermittent catheterisation, anticholinergic pharmacotherapy, and intravesical botulinum toxin as the management ladder for neuropathic detrusor overactivity
- Assesses an infant with myelomeningocele and constructs a structured urodynamic and surveillance plan that protects the upper tracts
- Counsels a family on the lifelong implications of a neurogenic bladder and the rationale for clean intermittent catheterisation
- Coordinates multidisciplinary spina bifida and continence care with urology, nephrology, and rehabilitation
- Level 1: Recognition of neurogenic bladder in a child with spina bifida and the risk to the upper tracts
- Level 2: Initiation of clean intermittent catheterisation and anticholinergic therapy and referral for urodynamic evaluation
- Level 3: Coordination of lifelong multidisciplinary continence and renal surveillance and transition to adult care
- Neurological control of micturition and the localisation of lesions that cause a neurogenic bladder
- Classification of detrusor overactivity, detrusor-sphincter dyssynergia, and impaired compliance from urodynamics
- The pharmacology of anticholinergic agents and botulinum toxin and their role in neuropathic detrusor overactivity
- Assessment of a child with a neurogenic bladder including the back, spine, sacrum, lower limbs, and a post-void residual
- Interpretation of uroflowmetry, post-void residual, and video-urodynamics in a child with suspected lower urinary tract dysfunction
- Structured explanation of the management ladder and lifelong renal surveillance to a child and family
- Distinction between neurogenic and non-neurogenic lower urinary tract dysfunction
- Urodynamic patterns of detrusor overactivity, dyssynergia, and impaired compliance and their renal consequences
- Stepwise management with clean intermittent catheterisation, anticholinergics, and intravesical botulinum toxin
- Recognition that a neurogenic bladder from spina bifida is a chronic threat to renal function requiring lifelong surveillance
- Initiation of clean intermittent catheterisation and anticholinergic therapy for a neuropathic bladder
- Family communication around continence, renal protection, and transition to adult urology and nephrology care
- Canadian approach to neurogenic bladder in spina bifida with early urodynamic surveillance and proactive management
- Population-based long-term renal outcome data in children managed with clean intermittent catheterisation from infancy
- Structured transition of continence and renal care from paediatric to adult services
Overview & Definition
A child who dribbles urine day and night despite sitting on the toilet, or a newborn with myelomeningocele who never achieves a normal stream, has a disordered lower urinary tract. The bladder has only two jobs — to store urine at a low pressure and to empty completely on command — and when either job fails, the cause is either a neurological lesion disrupting the nerve pathways to the bladder, or a learnt functional problem in an anatomically intact nervous system. These two families of disorder look similar on the surface but demand completely different management, and the examiner will test whether you can tell them apart. [1]
A neurogenic bladder (also called a neuropathic bladder) is disordered bladder storage or emptying caused by a congenital or acquired lesion that interrupts the nerve pathways running between the brain, the pontine micturition centre, the sacral spinal cord, and the bladder. In children the dominant cause by far is spinal dysraphism, above all myelomeningocele, but sacral agenesis, a tethered cord, a spinal cord tumour or injury, cerebral palsy, and the aftermath of sacrococcygeal teratoma resection all produce the same picture. The unifying feature is that the bladder has lost the coordinated nerve control it needs. [3]
The term dysfunctional voiding describes a different entity entirely. It belongs to the family of non-neurogenic, functional lower urinary tract disorders that appear in the toilet-trained child, in which the nervous system is anatomically intact but the child has learnt to void against a tightened pelvic floor or to postpone voiding until desperate. Overactive bladder, dysfunctional voiding, and voiding postponement sit on this functional side of the divide. The distinction matters because the functional disorders are common, benign, and managed with behavioural therapy and constipation treatment, whereas a neurogenic bladder is a lifelong threat to the kidneys that needs urodynamics, catheterisation, and medication. [12]
The clinical importance of the neurogenic bladder is the damage it does upstream. A bladder that stores urine at high pressure, or that empties against a sphincter that will not relax, transmits those pressures to the ureters and kidneys. The result is hydronephrosis, vesicoureteral reflux, recurrent pyelonephritis, renal scarring, hypertension, and progressive chronic kidney disease. Spina bifida is one of the commonest causes of paediatric end-stage kidney disease from a urological mechanism, which is why every child with a cord lesion needs urodynamic surveillance from infancy and a bladder kept low-pressure for life. [6]
References12ShowHide
- [1]Austin PF, Bauer SB, Bower W, Chase J, Franco I, Hoebeke P, et al The standardization of terminology of lower urinary tract function in children and adolescents: update report from the Standardization Committee of the International Children's Continence Society. J Urol, 2014.PMID 24508614
- [2]Bauer SB, Nijman RJ, Drzewiecki BA, Sillen U, Hoebeke P International Children's Continence Society standardization report on urodynamic studies of the lower urinary tract in children. Neurourol Urodyn, 2015.PMID 25998310
- [3]Bauer SB, Austin PF, Rawashdeh YF, et al. International Children's Continence Society's recommendations for initial diagnostic evaluation and follow-up in congenital neuropathic bladder and bowel dysfunction in children. Neurourol Urodyn, 2012.PMID 22532312
- [4]Chang SJ, Van Laecke E, Bauer SB, et al. Treatment of daytime urinary incontinence: A standardization document from the International Children's Continence Society. Neurourol Urodyn, 2017.PMID 26473630
- [5]Snow-Lisy DC, Yerkes EB, Cheng EY Update on Urological Management of Spina Bifida from Prenatal Diagnosis to Adulthood. J Urol, 2015.PMID 25839383
- [6]Joseph DB, Baum MA, Tanaka ST, et al. Urologic guidelines for the care and management of people with spina bifida. J Pediatr Rehabil Med, 2020.PMID 33252091
- [7]Le HK, Cardona-Grau D, Chiang G Evaluation and Long-term Management of Neurogenic Bladder in Spinal Dysraphism. NeoReviews, 2019.PMID 31792158
- [8]Sager C, Barroso U Jr, Bastos JM Netto, et al. Management of neurogenic bladder dysfunction in children update and recommendations on medical treatment. Int Braz J Urol, 2022.PMID 33861059
- [9]Austin PF, Franco I, Dobremez E, et al. OnabotulinumtoxinA for the treatment of neurogenic detrusor overactivity in children. Neurourol Urodyn, 2021.PMID 33305474
- [10]Franco I, Hoebeke PB, Dobremez E, et al. Long-term Safety and Tolerability of Repeated Treatments With OnabotulinumtoxinA in Children With Neurogenic Detrusor Overactivity. J Urol, 2023.PMID 36655470
- [11]Noh JW, Lee B, Kim JH Efficacy and safety of anticholinergics for children or adolescents with idiopathic overactive bladder: systematic review and meta-analysis. Int Urol Nephrol, 2019.PMID 31243632
- [12]Clothier JC, Wright AJ Dysfunctional voiding: the importance of non-invasive urodynamics in diagnosis and treatment. Pediatr Nephrol, 2018.PMID 28567611