Urethral Dilation – Procedure, Causes & Risks
Urethral dilation is a urological procedure used to widen a narrowed urethra. It is performed in cases of urethral stricture to restore normal urinary flow.
Things worth knowing about "Urethral Dilation"
Urethral dilation is a urological procedure used to widen a narrowed urethra. It is performed in cases of urethral stricture to restore normal urinary flow.
What is Urethral Dilation?
Urethral dilation is a medical procedure in which a narrowed urethra is mechanically widened to restore the normal flow of urine from the bladder. A narrowing of the urethra is medically known as a urethral stricture and can result from a variety of causes. Urethral dilation is one of the oldest and most commonly used treatments for this condition, and it is considered a minimally invasive approach.
Causes of a Urethral Stricture
A urethral stricture typically develops due to scar tissue formation within the urethra. Common causes include:
- Infections: Sexually transmitted infections such as gonorrhea can cause inflammation and subsequent scarring of the urethral lining.
- Trauma: Injuries to the pelvic area, or damage caused by urinary catheters or other medical instruments, can lead to stricture formation.
- Previous surgery: Procedures involving the prostate or urethra may leave scar tissue behind.
- Congenital narrowing: In rare cases, a stricture may be present from birth.
- Radiation therapy: Radiotherapy in the pelvic region can damage urethral tissue and lead to scarring.
Symptoms of a Urethral Stricture
Patients with a urethral stricture commonly experience one or more of the following symptoms:
- Weak or interrupted urinary stream
- Pain or burning sensation during urination
- Frequent urge to urinate with small amounts of urine
- Feeling of incomplete bladder emptying
- Urinary retention (complete inability to urinate)
- Recurrent urinary tract infections
Diagnosis
Before performing urethral dilation, the stricture must be confirmed through appropriate diagnostic methods:
- Uroflowmetry: Measures the rate of urine flow to assess the severity of the obstruction.
- Urethrocystoscopy: A small camera (endoscope) is passed through the urethra to directly visualize the narrowing.
- Retrograde urethrography: An X-ray examination using contrast dye to visualize the location and extent of the stricture.
- Ultrasound: Used to assess the bladder and measure post-void residual urine volume.
How Urethral Dilation is Performed
During urethral dilation, the stricture is gradually stretched open using specialized instruments. The procedure can be carried out in several ways:
Bougie Dilation
In the classic bougie technique, rigid or flexible rod-shaped instruments (called bougies) of progressively increasing sizes are passed through the urethra to mechanically stretch the narrowed area. This is typically performed under local anesthesia or light sedation.
Balloon Dilation
A catheter fitted with an inflatable balloon is advanced to the site of the stricture. The balloon is then inflated to widen the urethra. This technique is considered gentler and is preferred for short-segment strictures.
Intermittent Self-Catheterization
For patients with recurrent strictures, the treating physician may recommend regular self-catheterization to keep the urethra open and prevent re-narrowing. This approach helps maintain the results achieved through dilation.
When is Urethral Dilation Used?
Urethral dilation is primarily used for short-segment urethral strictures and is often the first-line treatment due to its minimally invasive nature. For longer, more complex, or recurrent strictures, surgical options such as internal urethrotomy (incision of the stricture) or urethroplasty (urethral reconstruction) may be necessary.
Risks and Side Effects
As with any medical procedure, urethral dilation carries certain risks, including:
- Temporary pain or bleeding following the procedure
- Urinary tract infections
- Recurrence of the stricture (recurrent stricture)
- Injury to the urethral wall in rare cases
Most complications are mild and resolve on their own. The treating physician will discuss all risks and benefits with the patient individually before the procedure is carried out.
Aftercare and Prognosis
After urethral dilation, patients are advised to drink plenty of fluids to flush the urethra and reduce the risk of infection. Follow-up appointments with a urologist are important to monitor treatment success and detect any recurrence of the stricture early. In some cases, multiple dilation sessions may be required to achieve a lasting improvement in urinary flow.
References
- Chapple C. et al. - European Association of Urology Guidelines on Urethral Strictures. EAU Guidelines, 2022.
- Wessells H. et al. - Urethral Stricture Disease. American Urological Association (AUA) Guideline, 2023.
- Schreiter F., Thon W. - Reconstructive Urology. Thieme Verlag, Stuttgart.
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