Overactive Bladder Syndrome: Management and Treatment Options
Overactive Bladder Syndrome: Management and Treatment Options
Overactive Bladder Syndrome: Management and Treatment Options
syndrome
Management and treatment options
Janine Arnold , Nicholas McLeod , Ruban Thani-Gasalam , Prem Rashid
Australian family physician vol.41, NO.11, November 2012
Background
Overactive bladder syndrome is a symptom-based clinical diagnosis. It is characterised by
urinary urgency, frequency and nocturia, with or without urge urinary incontinence. These
symptoms can often be managed in the primary care setting.
Objective
This article provides a review on overactive bladder syndrome and provides advice on
management for the general practitioner.
Discussion
Overactive bladder syndrome can have a significant effect on quality of life, and affects 12–17%
of the population. Prevalence increases with age. The management of overactive bladder
syndrome involves exclusion of underlying pathology. First line treatment includes lifestyle
interventions, pelvic floor exercises, bladder training and antimuscarinic agents. Failure of
conservative management necessitates urology referral. Second line therapies are more invasive,
and include botulinum toxin, neuromodulation or surgical interventions such as augmentation
cystoplasty or urinary diversion.
Keywords
overactive urinary bladder; urological diseases; urinary incontinence
Australia
- prevalence of urinary incontinence: 42%
- incidence of urgeonly incontinence: 6%.
Worldwide prevalence of OBS
- 12.8% for women
- 10.8% for men.
- increases with age.
Causes
Normal storage of urine
- spinal reflex mechanisms
- activate sympathetic and somatic pathways to the urethral outlet
- tonic inhibitory systems in the brain
- suppress the parasympathetic excitatory outflow to the urinary bladder.
The normal bladder fills like a compliant balloon, with pressure lower than urethral resistance.
Initiation of urination decreases urethral resistance and phasic contraction of the detrusor muscle
empties the bladder.4
Overactive bladder symptoms:
- involuntary contractions of the detrusor muscle sphincter response urge
incontinence
- most common cause of OBS
- detrusor overactivity (DO) (64%)
- 69% of men and 44% of women with urgency have DO.
- efferent (motor) hyper function/dysfunction and afferent (sensory) noise.
- Patients with OBS seem to respond to antimuscarinic treatment irrespective of the
presence of DO.13
Risk factors
- vaginal birth delivery
- older age
- obesity
- chronic constipation
- Childhood urinary symptoms (especially in women)
Diagnosis
Made by clinical exclusion
physical examination of the genitourinary system and relevant pelvic examinations should be
performed as there are multiple conditions that can cause or contribute to symptoms of
overactive bladder.4,17 Initial and secondary investigations are listed in Table 2.
different types of incontinence, so that the most effective method of treatment can be selected.
urodynamic investigations should also be used to demonstrate the presence of specific
abnormalities before undertaking complex reconstructive urological procedures.20
urine cytology, performed on three voided specimens obtained on three separate days,
has a
variable sensitivity for the detection of urothelial carcinoma.21 urine cytology is effective for
screening for high grade lesions (sensitivity at least 90%, specificity 98–100%) and carcinoma in
situ. however, it is unreliable for detection of well differentiated, low grade lesions.21
cystoscopy is indicated in patients with
sterile haematuria and risk factors for bladder cancer,
and in patients with recurrent urinary tract infections. carcinoma in situ and other intravesical
abnormalities can be assessed via cystoscopy.
The possibility of prostate cancer should also be
considered in men and assessed based on prostate- specific antigen, digital rectal examination
findings and relevant risk factors.4
Treatment
Principles of treatment are to reduce urinary incontinence by changing patient behaviour and
teaching continence skills.22
up to one-third of women with urge only incontinence can undergo spontaneous resolution at 2
years.8 As OBS is a symptom complex, ‘no treatment’ is an acceptable choice for some patients
and caregivers.23
Antimuscarinic medications
Inadequate therapy:
- add second antimuscarinic (or duloxetine) before considering second or third line
therapies
- Manage: Dry mouth and constipation
- Cochrane:
o Symptomatic improvements were
more common in patients on anticholinergic
drugs compared with bladder training
o combination
of anticholinergics with bladder training more improvement
than bladder training alone (RR 0.55; 95% cI: 0.32–0.93).
- cognitive dysfunction
- memory loss
- attention deficits
- adverse events depends on
- each drugs’ lipophilicity
- ability to cross the blood-brain barrier.
- Oxybutinin: most likely to cross the blood-brain barrier.13
Older adults:
Oxybutinin
can be started at 2.5 mg twice per day. The morning dose can be increased or a lunchtime dose
added depending on severity and timing of symptoms. The maximum dose is 5 mg three times
per day.32 high doses are often not well tolerated due to dry mouth, gritty eyes, exacerbation of
gastrointestinal reflux and constipation.
Nonantimuscarinic medications
Duloxetine (a serotonin noradrenaline reuptake inhibitor) can be effective in both stress and
mixed stress and urge incontinence.33 however, it is currently only Therapeutic Goods
Administration (TGA) indicated and Pharmaceutical Benefits Scheme (PBS) subsidised in
Australia for major depressive disorder. In clinical practice, most women discontinue duloxetine
within 4 weeks due to adverse effects (Table 7).
Failure of conservative and medical treatments warrants urology referral for further investigation
with urodynamics, and more invasive therapies may be considered.1,4
augmentation cystoplasty
- bladder is enlarged by incorporating a variety of different patches into the native bladder,
usually patchesof bowel still attached to their mesentery (ileum, caecum or sigmoid
colon).
- Indications:
o small, contracted bladder
o dysfunctional bladder with poor compliance.40
- urinary diversion
o only when conservative treatments have failed, and sacral nerve stimulation and
augmentation cystoplasty are not appropriate or unacceptable to the patient.
Key points
Overactive bladder syndrome is a symptomatic diagnosis consisting of urinary frequency,
urgency and nocturia, with or without urge urinary incontinence.
There is a significant impact on quality of life, which can lead to depression and affect
relationships. Patients are often too embarrassed to discuss symptoms with their GP.
Pathology such as urinary infection, diabetes, bladder stones, malignancy or an
underlying neurological cause should be excluded.
Initial treatment consists of a combination of lifestyle interventions, pelvic floor
exercises, bladder training and antimuscarinic medications.
Care should be taken when prescribing antimuscarinic therapy in the elderly.