Neurogenic Bladder Management in Spinal Cord Injury: Long-term Renal Function Preservation

Abstract

Introduction: Neurogenic detrusor overactivity (NDO) following spinal cord injury (SCI) risks upper tract deterioration. This review compares long-term renal outcomes of different bladder management strategies: clean intermittent catheterization (CIC), indwelling catheter, and reflex voiding.

Methods: Systematic search of PubMed, CINAHL, and PEDro (2000–2024) for studies with ≥5 years follow-up of SCI patients. Inclusion: adults with chronic SCI (≥1 year), documented bladder management, and serial renal imaging (DMSA or ultrasound). Primary outcome: new-onset hydronephrosis or renal scarring.

Results: Twenty-one studies (n=2,014) reported median follow-up of 8 years. CIC + antimuscarinics had lowest rates of hydronephrosis (12%) and renal scarring (8%). Indwelling urethral catheter had highest rates (hydronephrosis 34%, scarring 28%). Reflex voiding without pharmacotherapy showed intermediate risk (hydronephrosis 22%). Detrusor-sphincter dyssynergia was associated with 4-fold higher risk of deterioration if untreated.

Discussion: Regular CIC with intravesical pressure control (detrusor leak point pressure <40 cmH2O) is renoprotective. Most studies were retrospective, with survivor bias. Adherence to urodynamic surveillance was poor in real-world cohorts.

Conclusions: Long-term renal preservation in neurogenic bladder after SCI requires a combination of CIC and antimuscarinic/onabotulinumtoxinA to maintain low storage pressures. Indwelling catheters should be avoided when possible. Annual renal ultrasound is recommended.