Overactive bladder
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Overactive bladder (OAB) is a syndrome of symptoms resulting from abnormal, excessive activity of the detrusor muscle of the urinary bladder, leading to sudden and difficult-to-control urges to urinate. This entity is not a disease in the etiological sense, but a clinical syndrome whose diagnosis is based on symptoms in the absence of infection or other obvious pathologies of the lower urinary tract. OAB affects both sexes, and its prevalence increases with age. The condition significantly affects quality of life, disrupting sleep, social functioning, and work activity.
Overactive bladder – symptoms
The primary symptom of overactive bladder is urinary urgency (imperative urgency), which appears suddenly and is difficult to postpone. This symptom constitutes a diagnostic criterion for OAB and may occur with accompanying voiding disturbances.
The most common symptoms include:
- daytime frequency – passing urine more than 8 times a day,
- nocturia – the need to urinate at night (at least one episode),
- urge urinary incontinence (urge incontinence) – involuntary leakage of urine preceded by a sudden urge.
Unlike stress urinary incontinence, the symptoms are not related to coughing, sneezing, or physical activity.
Additionally, patients often report:
- a constant sense of tension in the bladder,
- the need to use the toilet immediately,
- restriction of social activities,
- sleep disturbances resulting from nocturia.
It is worth emphasizing that symptom intensity may be variable and modulated by environmental factors such as:
- consumption of caffeine and alcohol,
- stress,
- hormonal changes,
- lower urinary tract infections.
Overactive bladder – causes
The pathophysiology of overactive bladder is complex and involves dysregulation between the nervous system and the detrusor muscle. A key mechanism is uncontrolled contractile activity of the detrusor during the bladder filling phase.
Neurophysiological mechanisms
The micturition process is regulated by a complex network of interactions between:
- cortical centers of the brain,
- pontine micturition center,
- spinal cord,
- autonomic nervous system.
In OAB the following occur:
- lowering of the excitation threshold of sensory receptors in the bladder wall,
- excessive activation of cholinergic fibers,
- impaired central inhibition of the micturition reflex.
Most common causes and risk factors
1. Neurological:
- Parkinson's disease,
- multiple sclerosis,
- stroke,
- spinal cord injuries.
2. Hormonal and metabolic:
- estrogen deficiency (urogenital atrophy),
- diabetes (autonomic neuropathy).
3. Age-related:
- reduced elasticity of the bladder wall,
- degenerative changes in the nervous system.
4. Local factors:
- chronic inflammatory conditions,
- urothelial receptor overactivity,
- changes in the bladder microbiome.
5. Lifestyle:
- excessive caffeine intake,
- obesity,
- chronic stress.
In many cases the cause remains elusive – this is referred to as the idiopathic form.
Overactive bladder – differences from other voiding disorders
Correct differentiation of overactive bladder from other voiding disorders is of key clinical importance, as it determines the choice of therapy.
Key clinical differences
| Condition | Mechanism | Dominant symptom |
|---|---|---|
| Overactive bladder | Detrusor overactivity | Urgency |
| Stress urinary incontinence | Sphincter insufficiency | Leakage with exertion |
| Mixed urinary incontinence | Mixed mechanism | Combined symptoms |
| Bladder outlet obstruction | Impaired outflow | Weak stream |
| Urinary tract infection | Inflammation | Pain, burning |
Differential diagnosis
In the diagnostic process the following are used:
- voiding diary – assessment of the frequency and volume of voided urine,
- urinalysis – exclusion of infection,
- ultrasound of the urinary tract – assessment of residual urine (post-void residual),
- urodynamic testing – identification of detrusor overactivity.
Urodynamic testing enables an objective assessment of bladder function by recording intravesical pressures and muscle activity during the filling and voiding phases.
Overactive bladder – when to see a specialist
Symptoms of overactive bladder require specialist consultation, especially when they affect daily functioning or are progressive.
Indications for a visit
- persistent urgency to urinate,
- urinary frequency and nocturia,
- episodes of urinary incontinence,
- no improvement after lifestyle changes,
- alarm symptoms (hematuria, pain, sudden change in voiding pattern).
Treatment – a multistep approach
Therapeutic management follows a stepwise model:
1. Behavioral therapy and physiotherapy:
- bladder training,
- pelvic floor muscle training,
- modification of voiding habits,
- reduction of irritant factors (caffeine, alcohol).
2. Pharmacotherapy:
- antimuscarinic drugs (inhibiting detrusor contractions),
- β3-adrenergic receptor agonists (increasing bladder capacity).
3. Interventional treatments:
- botulinum toxin injections into the bladder wall,
- sacral nerve neuromodulation,
- posterior tibial nerve stimulation.
Modern supportive methods
In clinical practice, therapies that support pelvic floor function and improve voiding control are becoming increasingly important:
- radiofrequency (e.g., INDIBA) – improvement of tissue blood flow and regeneration,
- gynecological laser therapy – improvement of mucosal quality and tissue tone,
- electrostimulation of the pelvic floor muscles – improvement of neuromuscular control.
These methods complement primary treatment, particularly in female patients with concomitant weakening of pelvic floor structures.
Early diagnosis and initiation of therapy allow effective symptom control and a significant improvement in patients' quality of life.