Benign Prostatic Hyperplasia (BPH)

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8 أقسام

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Background

  • Benign prostatic hyperplasia (BPH) or benign prostatic hypertrophy is a histologic diagnosis (smooth, elastic, firm nodular enlargement) of the prostate (epithelial and/or stromal)
  • BPH occurs frequently in the lateral and middle lobes (subsequently compresses the urethra)
  • This condition is common in men > 50 years old (not premalignant)
  • BPH can lead to chronic bladder outlet obstruction (urinary retention, impaired kidney function, recurrent urinary tract infections, gross hematuria, and bladder stones)
  • There are pharmacological and surgical therapeutic modalities

 

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Clinical features

  • Urinary frequency
  • Urinary urgency
  • Nocturia (needing to get up frequently at night to urinate)
  • Hesitancy (difficulty initiating the urinary stream; interrupted, weak stream
  • Incomplete bladder emptying (feeling of persistent residual urine)
  • Staining (needing to strain or push to initiate and maintain urination to fully empty the bladder)
  • Decreased force of stream
  • Dribbling (small amounts of urine due to a poor urinary stream)
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Diagnosis

  • Digital rectal examination (DRE)
  • Serum labs
    • Prostate-specific antigen (PSA) is not specific for benign prostatic hyperplasia (can be elevated in prostatic cancer)
    • Urinalysis
    • Urine culture (to exclude infectious causes of irritation voiding)
    • Electrolyte, blood urea nitrogen (BUN), and creatinine
  • Invasive studies
    • Ultrasonography (abdominal, renal, transrectal)
  • International Prostate Symptom Score (I-PSS)
    • The severity of BPH can be determined with IPSS/American Urological Association Symptom Index (AUA-SI)

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Differential diagnosis

  • Prostatic cancer
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Treatment

  • Pharmacological therapy
    Medical therapy for benign prostatic hyperplasia
    Alpha-adrenergic antagonists (eg, terazosin, tamsulosin)
    • Relax smooth muscle in bladder neck, prostate capsule and prostatic urethra
    • Usual first line therapy
    • Adverse effects: orthostatic hypotension, dizziness
    5-Alpha reductive inhibitors (eg, finasteride, dutasteride)
    • Inhibit conversion of testosterone to dihydrotestosterone (DHT)
    • Reduce prostate gland size
    • Effectiveness may take 6-12 months
    • Adverse effects: decreased libido, erectile dysfunction
    Antimuscarinics (eg, tolterodine)
    • Used to treat overactive bladder (urinary frequency, urgency and incontinence)
    • Adverse effects: urine retention, dry mouth

     

  • Surgical therapy
    • Transurethral resection of the prostate (TURP)
    • Open prostatectomy (indications include patients with very large prostates, patients with concomitant bladder stones or bladder diverticula, and patients who cannot be positioned for transurethral surgery)

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Complications

  • Bladder outlet obstruction with acute urinary retention (distention of bladder and/or hydronephrosis)
  • Recurrent urinary tract infections
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Supplementary tables

  • Table 1: comparison of benign prostatic hyperplasia and prostate cancer
Benign Prostatic Hyperplasia (BPH) Prostate cancer
Risk factors
  • Age > 50 years
  • Age > 40 years, African American and positive family history
Affected part
  • Central portion (transitional zone)
  • Usually peripheral zone of prostate but can be anywhere
Examination
  • Symmetrically enlarged and smooth prostate
  • Can have elevated PSA
  • Asymmetrically enlarged, nodules and firm prostate
  • Markedly elevated PSA

 

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