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Bladder Neck Stenosis: Causes, Symptoms and Treatment

Bladder neck stenosis is a narrowing of the bladder outlet that restricts urine flow. It can affect men, women, and children and typically causes lower urinary tract symptoms.

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Things worth knowing about "Bladder Neck Stenosis"

Bladder neck stenosis is a narrowing of the bladder outlet that restricts urine flow. It can affect men, women, and children and typically causes lower urinary tract symptoms.

What is Bladder Neck Stenosis?

Bladder neck stenosis refers to an abnormal narrowing of the bladder neck – the junction between the urinary bladder and the urethra. This narrowing restricts or blocks the normal outflow of urine from the bladder. It is also referred to as bladder neck obstruction (BNO). The condition may be congenital (present at birth) or acquired during a person's lifetime, and it can affect both men and women, as well as children in rare cases.

Causes

The causes of bladder neck stenosis vary depending on sex and age:

Scar tissue: Pelvic surgery, bladder procedures, or prostate operations can leave scar tissue that narrows the bladder neck.
Chronic inflammation: Recurrent urinary tract infections or chronic cystitis can lead to structural changes at the bladder neck.
Benign prostatic hyperplasia (BPH): In men, non-cancerous enlargement of the prostate is a common cause of functional bladder neck obstruction.
Radiation therapy: Radiation to the pelvic area can damage surrounding tissue and cause stenosis.
Congenital malformations: A rare inborn narrowing of the bladder neck, diagnosed mainly in boys.
Primary bladder neck obstruction (PBNO): An independent form of bladder neck narrowing not explained by other conditions, particularly seen in young men and women.

Symptoms

Symptoms of bladder neck stenosis result from impaired urine outflow and may include:

Weak or intermittent urinary stream
Hesitancy at the start of urination
Straining to urinate or post-void dribbling
Sensation of incomplete bladder emptying
Frequent urination (pollakiuria) or nocturia (waking at night to urinate)
Urinary retention in advanced cases
Recurrent urinary tract infections due to residual urine

In severe cases, urine backflow can lead to kidney damage (hydronephrosis).

Diagnosis

Several diagnostic methods are used to identify bladder neck stenosis:

Medical history and physical examination: Assessment of symptoms, prior conditions, and surgeries.
Uroflowmetry: Measurement of urine flow rate; a flattened flow curve may indicate obstruction.
Post-void residual measurement: Ultrasound is used to determine how much urine remains in the bladder after voiding.
Cystoscopy: Direct visual inspection of the bladder neck and urethra using a thin endoscope.
Urodynamic testing: Functional measurement of bladder pressure and urine flow to precisely characterize the obstruction.
Imaging: Ultrasound or MRI to evaluate the kidneys, ureters, and bladder.

Treatment

Treatment of bladder neck stenosis depends on the underlying cause, severity, and the overall health of the patient:

Medication

For milder cases or as a temporary measure, alpha-1 blockers (e.g., tamsulosin) may be prescribed. These medications relax the smooth muscle of the bladder neck and prostate, improving urine flow.

Minimally Invasive Procedures

For more significant narrowing, a bladder neck incision (BNI) or transurethral resection of the bladder neck (TURBN) may be performed. In these endoscopic procedures, the obstructing tissue is incised or removed to restore normal urine flow.

Balloon Dilation

In certain cases, the narrowed area may be stretched using a balloon catheter. This approach is generally less durable than surgical options.

Surgical Reconstruction

For complex or recurrent stenoses, open or laparoscopic surgery to reconstruct the bladder neck may be required.

Treating the Underlying Condition

When BPH or another treatable condition is responsible, addressing that condition is the primary focus of therapy.

References

Deutsche Gesellschaft fur Urologie (DGU) – Guidelines on the Diagnosis and Treatment of Bladder Emptying Disorders (2022).
Chapple, C.R. et al. – Bladder outlet obstruction. In: European Urology, 2006.
Abrams, P. et al. – The standardisation of terminology of lower urinary tract function. In: Neurourology and Urodynamics, 2002.

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