Disease Description (Causes and Symptoms)
Neurogenic bladder is a condition in which the bladder’s storage and emptying functions become abnormal due to damage to the nervous system involved in regulating the urinary system, including the cerebrum, brainstem, spinal cord, and peripheral nerves.
Major causes: stroke, spinal cord injury, multiple sclerosis, Parkinson’s disease, dementia, spinal lesions such as herniated intervertebral discs and spinal stenosis, diabetic neuropathy, bladder ischemia, and others.
Pathophysiology (major types):
- Overactive bladder (involuntary detrusor contractions → urgency, frequency, nocturia, and urinary incontinence)
- Underactive (atonic) bladder (detrusor weakness → hesitancy, weak urinary stream, and residual urine)
- Detrusor–sphincter dyssynergia → increased risk of upper urinary tract damage due to high bladder pressure
Major symptoms: urinary frequency, urinary urgency, nocturia, urinary incontinence, difficulty urinating (delay and weak stream), a feeling of incomplete emptying, recurrent urinary tract infections, and decreased kidney function (if progression occurs).
Diagnosis (brief summary): medical history and physical examination, voiding diary, urine tests (pyuria and bacteriuria), kidney function evaluation including serum creatinine, abdominal and kidney ultrasound (to check for hydronephrosis), urodynamic testing (measurement of pressure during bladder filling, detrusor activity, and residual urine), and, if necessary, cystourethrography (to check for vesicoureteral reflux and the condition of the bladder neck).
Treatment Methods and Precautions
The goals of treatment are to improve symptoms, prevent urinary tract infections, prevent high-pressure bladder conditions that threaten the upper urinary tract, and preserve kidney function. Individualized treatment is needed depending on the patient’s condition (overactive vs. underactive bladder, location of the neurological lesion, kidney risks, and others).
Treatment Options
- Conservative and behavioral therapy
- Bladder training, regular intermittent voiding (timed voiding), fluid and caffeine control, and bowel movement (constipation) management
- Medication
- Overactive bladder: antimuscarinic agents (oxybutin, tolterodine, solifenacin, etc.) and beta-3 agonists (mirabegron)
- Underactive bladder (selective use): beta-adrenergic and cholinergic agonists (e.g., bethanechol) may be used, but evidence is limited
- α-blockers or other medications may be considered in cases of urethral obstruction or detrusor–sphincter dyssynergia
- Botulinum toxin injection
- Intravesical botulinum toxin injection for overactive and medication-refractory detrusor overactivity (effective)
- Neuromodulation
- Symptom improvement in some patients with sacral neuromodulation and other treatments
- Voiding assistance and catheterization
- Intermittent self-catheterization is recommended (a priority consideration when residual urine is substantial)
- Long-term indwelling catheterization (urethral or suprapubic catheter) is used in specific situations
- Surgical treatment
- Augmentation cystoplasty, urinary diversion, and other procedures may be considered when kidney function preservation is necessary or conservative treatment fails
- In men with severe voiding dysfunction and detrusor–sphincter dyssynergia, some procedures, such as urethral sphincter incision, may be available
Precautions and Risk of Complications
- If residual urine or high-pressure bladder is left untreated, it may progress to urinary tract infection, bladder damage, hydronephrosis, and chronic kidney failure
- Catheterization, particularly long-term indwelling catheterization, increases the risk of urinary tract infections
- Medication side effects: antimuscarinic agents (dry mouth, constipation, blurred vision, and possible worsening of cognitive impairment—caution, especially in older adults), mirabegron (caution in hypertension)
- Urinary retention may worsen after botulinum toxin injection—confirm whether catheterization is needed
- Hygiene management and education are necessary for self-catheterization (to prevent infection)
Self-Management (Daily Recommendations)
- Keep a voiding diary (voiding frequency, urine volume, urgency, nocturia, urinary incontinence, and others)
- Maintain regular voiding habits (timed voiding) and prevent constipation
- Limit excessive caffeine and alcohol intake and maintain fluid balance
- Follow catheter care and cleanliness practices; contact a medical institution immediately if symptoms of a urinary tract infection occur (fever, painful urination, foul-smelling or cloudy urine)
- Regularly monitor kidney function (serum creatinine), undergo kidney and bladder ultrasound, and follow up with urine tests
Outpatient Visit Checklist (Including Preparation Items and Example Questions)
Preparation Items (Recommended to Bring)
- Currently used medications (medication packets or a medication list), including supplements and herbal medicines
- Previous neurological diagnoses (such as stroke or spinal cord injury) or relevant medical records
- Recent urine test and blood test results (creatinine), and ultrasound, CT, MRI, or urodynamic test results, if available
- Voiding diary (recommended for at least 3 days): records of voiding times, urine volume, urgency, and urinary incontinence
- Information about any catheter currently being used and the catheterization method, if applicable
Examples of Symptom Records and Questions to Prepare for the Outpatient Visit
- When the symptoms began and how they have progressed (acute vs. chronic)
- Urine volume (total daily volume), voiding frequency, and number of nighttime voids
- A feeling of residual urine after urination or the actual amount of residual urine, if measurable
- Recent history of urinary tract infections (symptoms and antibiotic treatment history)
Examples of General Questions to Ask the Doctor
- What type of neurogenic bladder do I have (overactive, underactive, dyssynergia, etc.)? What do the urodynamic test results mean?
- What treatment (medication, catheterization, or procedure) is recommended as the priority for my current symptoms? What are the advantages and disadvantages?
- What are the major side effects and precautions for the medication I will be prescribed? What tests should be monitored while taking it?
- What testing schedule should I follow to prevent infection or worsening kidney function?
Examples of Condition-Specific Questions
- In my case, how much residual urine (or bladder pressure) is present, and do I need intermittent self-catheterization to reduce it?
- High bladder pressure (or detrusor overactivity) was confirmed on urodynamic testing. Would a procedure such as botulinum toxin injection or sacral neuromodulation be appropriate? What are the expected benefits and risks?