PHT5247 - Disorders of the Bladder and Urethra

Overview of Bladder and Urethra Disorders

  • Focus on voiding dysfunction associated with neurological pathology.

  • Term: Neurogenic bladder disorder or neurogenic lower urinary tract dysfunction.

Voiding Dysfunction

  • Common problem linked with various neurological diseases.

  • Costly and detrimental to quality of life, particularly among older adults requiring long-term care.

Causes of Voiding Dysfunction

  • Damage to nerves affecting bladder function can result in voiding dysfunction.

    • Neurological conditions associated include:

    • Cerebrovascular accidents (strokes)

    • Dementia

    • Parkinson's disease

    • Multiple sclerosis

    • Brain tumors

  • Lesions in the spinal cord can mimic reflexive bladder characteristics seen in cerebral injuries.

    • Conditions causing such lesions include:

    • Spinal cord injury

    • Herniated intervertebral disks

    • Vascular lesions

    • Spinal cord tumors

Urinary Incontinence

  • Defined as:

    • Involuntary loss of urine, significant enough to be problematic.

    • Occurs mainly when bladder pressure exceeds sphincter resistance.

Types of Urinary Incontinence

  1. Functional incontinence:

    • Bladder function is normal but mind and body fail to coordinate effectively.

    • Can arise from mobility and access limitations (e.g., confined to a wheelchair or requiring a walker).

  2. Stress incontinence:

    • Support for the bladder or urethra is weakened or damaged; the bladder remains normal.

    • Triggered by pressure on the bladder from actions like coughing, sneezing, laughing, lifting, or exercising.

    • Resultant pelvic floor musculature lacks the strength to counteract the increased urethral or bladder pressure.

  3. Urge incontinence:

    • Characterized by involuntary contraction of the detrusor muscle—smooth muscle of the bladder wall.

    • Occurs with a strong desire to void, often leading to immediate loss of urine, with no known infection or other pathology.

    • Potential causes:

      • Medications

      • Alcohol

      • Bladder infections

      • Bladder tumors

      • Neurogenic bladder conditions

      • Bladder outlet obstructions

  4. Overflow incontinence:

    • Results from overdistension of the bladder, where it fails to empty completely.

    • The urine leaks or dribbles out; the patient experiences no sensation of fullness or emptying.

    • In men, often secondary to obstruction from:

      • Prostatic hyperplasia

      • Prostatic carcinoma

      • Urethral stricture

Treatment Options

  • Antimuscarinics:

    • Help reduce bladder hypotonicity by inhibiting detrusor muscle contractions.

    • Benefits:

    • Allow more normal bladder filling

    • Reduce frequency of urination

    • Decrease chances of incontinence

    • Side effects include:

    • Dry mouth

    • Constipation

    • Blurred vision

    • Potential drowsiness, especially when combined with other medications

  • Beta-3 agonists:

    • Used to inhibit bladder muscle contractions, providing an additional treatment pathway.

  • Botox (Botulinum toxin A):

    • Involves injecting a neurotoxin to relax the bladder muscles.

    • Used when patients do not respond to other treatment options for urinary incontinence and overactive bladder.

    • Considerations:

    • Watch for adverse effects, including urinary retention, urinary tract infections, and increased blood pressure.

Other Therapeutic Approaches

  • Diet modification:

    • Aim to avoid bladder irritants such as coffee and alcohol.

  • Bladder training and behavioral therapy:

    • Techniques aimed at improving voiding habits and managing symptoms.

  • Pelvic floor strengthening:

    • Exercises that enhance the supportive structures of the bladder and urethra.