---

BENIGN PROSTATIC ENLARGEMENT (BPE / BPH)

Complete Urology Resident Teaching Guide

---

CHAPTER 1: DEFINITIONS & TERMINOLOGY

Q: What is the difference between BPH, BPE, and LUTS? Why does it matter?

Examiner tip: Always say "BPH is a histological diagnosis." Size ≠ symptoms. A 150 g prostate may cause no obstruction; a 30 g prostate may cause severe BOO.

---

CHAPTER 2: EPIDEMIOLOGY

Q: Give me prevalence figures for BPH.

• Histologic prevalence at autopsy (classic figures - must memorize):
  • Age 31-40 years: 8%
  • Age 41-50 years: ~20%
  • Age 51-60 years: ~50%
  • Age 61-70 years: ~65%
  • Age 71-80 years: ~80%
  • Age >80 years: ~90%
• At age 55: ~25% of men report obstructive voiding symptoms
• At age 75: ~50% of men complain of decreased force and caliber of stream

Q: What are the risk factors for BPH?

1. Age - most important; BPH is rare before 40
2. Functioning testes - castrated men do NOT develop BPH (classical observation)
3. Genetics - ~50% of men who need surgery before age 60 have a heritable form
   • Autosomal dominant inheritance
   • First-degree male relatives: 4-fold increased risk
4. Race - higher incidence in African Americans; lower in Asians
5. Diet - high fat, red meat associated; soy (phytoestrogens) may be protective
6. Obesity / metabolic syndrome - associated
7. Estrogen levels of aging - increased estrogen sensitizes prostate to testosterone

Q: What two conditions are REQUIRED for BPH to develop?

Answer: Aging + functioning testes (intact androgen production)

Eunuchs castrated before puberty NEVER develop BPH - a fundamental principle.

---

CHAPTER 3: ANATOMY - THE ZONES OF THE PROSTATE

Q: In which zone does BPH develop? Where does prostate cancer develop?

McNeal Zone Anatomy (must know perfectly):

• BPH arises in the transition zone around the periurethral glands
• The enlarged transition zone compresses the peripheral zone - creating the "surgical capsule"
• This surgical capsule is what makes simple prostatectomy (enucleation) possible

Q: What is the surgical capsule of the prostate?

The compressed rim of peripheral zone tissue surrounding the hyperplastic transition zone. This natural cleavage plane allows enucleation in open simple prostatectomy (Millin's / Freyer's procedure).

---

CHAPTER 4: PATHOPHYSIOLOGY

Q: Explain the molecular basis of BPH.

A. Endocrine/Androgen Role:

1. Testosterone is converted to Dihydrotestosterone (DHT) by 5-alpha reductase type 2 in prostatic stromal cells
2. DHT is the primary intraprostatic androgen - 10x more potent than testosterone in stimulating prostate growth
3. DHT binds androgen receptors → stimulates epithelial and stromal cell proliferation
4. Castration → DHT falls → prostate involutes (this is the basis of 5-ARI treatment)

B. Estrogen Role:

• Aging men have increased estrogen:testosterone ratio
• Estrogen upregulates androgen receptors in prostatic stroma → sensitizes prostate to free testosterone
• Estrogens acting through stromal and epithelial estrogen receptors may contribute to prostatic disease

C. Stromal-Epithelial Interaction:

• BPH involves both stromal (smooth muscle, collagen) and epithelial elements
• Stromal predominance → responds to alpha-blockers
• Epithelial predominance → responds to 5-ARIs
• Composition varies → explains variable treatment response

D. Growth Factors:

• FGF (Fibroblast Growth Factor) - promotes stromal growth
• KGF (Keratinocyte Growth Factor) - stromal to epithelial signaling
• IGF-1 (Insulin-like Growth Factor)
• EGF (Epidermal Growth Factor)
• TGF-beta - inhibitory; may be reduced in BPH

E. Two Mechanisms of Urinary Obstruction in BPH:

This is why alpha-blockers work immediately (relaxing dynamic tone) while 5-ARIs take months (need epithelial cell apoptosis to reduce static component).

---

CHAPTER 5: PATHOLOGY

Q: Describe the gross and microscopic pathology of BPH.

Gross:

• Normal prostate weight: 20 g
• BPH weight: typically 20-100 g, can exceed 200 g
• Cut surface: rubbery nodular tissue with pale yellow-white areas of stromal overgrowth and small cystic spaces (glandular dilation)
• Lateral lobes enlarge most; median lobe when enlarged projects into bladder (ball-valve obstruction - no lobe palpable on DRE!)

Microscopic:

• Nodular growth pattern - hallmark
• Nodules contain: smooth muscle + collagen stroma and/or hyperplastic epithelial glands
• Epithelial lining: pseudostratified tall columnar cells with basal cells
• Corpora amylacea (prostatic concretions) may be seen
• No cytologic atypia, no invasion

Q: What is the clinical importance of the median lobe?

The median lobe projects into the bladder neck, causing obstruction despite a small palpable prostate on DRE. It can cause ball-valve type obstruction. It is NOT palpable rectally. Treatment: TURP or HoLEP.

Bladder Changes due to BPH (secondary effects):

1. Detrusor hypertrophy - trabeculation (raised ridges = trabeculae)
2. Cellules - small outpouchings between trabeculae
3. Diverticula - larger outpouchings that extend beyond bladder wall (have no muscle → do not empty → stone formation, infection, even carcinoma)
4. Chronic urinary retention → hydronephrosis → obstructive uropathy → renal failure

---

CHAPTER 6: SYMPTOMS - LUTS CLASSIFICATION

Q: Classify LUTS. Give examples of each type.

Storage (Irritative) Symptoms - due to detrusor overactivity / reduced bladder compliance:

• Frequency
• Urgency
• Urgency incontinence
• Nocturia
• Mnemonic: FUN + Nocturia (Frequency, Urgency, Nocturia)

Voiding (Obstructive) Symptoms - due to BOO:

• Hesitancy (difficulty initiating)
• Weak/poor stream
• Straining/pushing
• Intermittency
• Prolonged voiding
• Terminal dribbling

Post-Micturition Symptoms:

• Incomplete emptying sensation
• Post-micturition dribble

Key point: Irritative symptoms are often MORE bothersome to patients. Storage symptoms correlate poorly with degree of obstruction. Nocturia is the most common complaint and worst for quality of life.

---

CHAPTER 7: IPSS (INTERNATIONAL PROSTATE SYMPTOM SCORE)

Q: What is the IPSS? How many questions? What are the cutoffs?

IPSS = AUA Symptom Score (identical questionnaire)

• 7 symptom questions (each scored 0-5) + 1 Quality of Life question (scored 0-6)
• Total symptom score: 0-35

The 7 Questions (Mnemonic: "I-FIF-W-S-N" or FUWISE + Nocturia):

1. Incomplete emptying - sensation of not emptying completely
2. Frequency - urinate again <2 hours after last void
3. Intermittency - stop and start
4. Urgency - difficulty postponing urination
5. Weak stream
6. Straining - push/strain to begin urination
7. Nocturia - times up at night (scored 0-5)

Score Interpretation:

QoL Question:

Examiner Q: IPSS is a symptom score - what does it NOT tell you?

It does NOT tell you if the cause is BPH. It does NOT quantify bladder function. It does NOT predict surgical outcome. It assesses symptom burden and QoL.

---

CHAPTER 8: DIAGNOSIS

Q: A 65-year-old man presents with LUTS. What is your initial evaluation?

Mandatory Initial Evaluation (Recommended by AUA/EAU):

1. History
   • Duration, severity of LUTS
   • Medication history (diuretics, anticholinergics, sympathomimetics)
   • Prior urologic history (stricture, surgery, radiation)
   • Sexual function (baseline before treatment)
   • Fluid intake habits
2. IPSS Score
3. Physical Examination
   • DRE - prostate size (normal = walnut-sized ~20 g), consistency (smooth, rubbery = BPH; hard/nodular = cancer), tenderness
   • Suprapubic palpation (distended bladder)
   • Focused neurological exam
4. Urinalysis - rule out infection, hematuria, glucose
   • If hematuria → further evaluation (cystoscopy, upper tract imaging)
5. PSA (in appropriate candidates)
   • Adds information about prostate size (PSA correlates with volume)
   • Predicts likelihood of BPH progression
   • Rules out concurrent prostate cancer
6. Post-Void Residual (PVR) - by ultrasound
   • Normal: <50 mL
   • Mildly elevated: 50-200 mL (may not need immediate action)
   • Significantly elevated: >200-300 mL → suggests detrusor decompensation

Optional / Indicated Studies:

Q: What is Qmax and what value suggests BOO?

• Qmax = maximum urinary flow rate (normal >15 mL/s)
• Qmax <10 mL/s = strongly suggestive of BOO
• Qmax 10-15 mL/s = equivocal
• Must void >150 mL for a valid reading

---

CHAPTER 9: INDICATIONS FOR TREATMENT

Q: When do you MUST treat (absolute indications) vs. when is treatment elective?

Absolute Indications for Surgical Treatment:

1. Acute urinary retention (AUR) - failed trial without catheter (TWOC)
2. Chronic urinary retention with overflow incontinence
3. Recurrent urinary tract infections secondary to BPH
4. Recurrent gross hematuria due to BPH (after ruling out malignancy)
5. Bladder stones secondary to BPH/BOO
6. Renal insufficiency/obstructive uropathy from BPH
7. Large bladder diverticula secondary to BPH

Mnemonic: RRRASH - Retention, Renal impairment, Recurrent UTI, Recurrent hematuria, Azotemia (renal impairment), Stones, Hematuria

Elective/Relative Indications:

• Moderate-severe LUTS (IPSS 8+) not responding to medical therapy
• Patient preference
• Significant QoL impact

---

CHAPTER 10: MANAGEMENT

Treatment Algorithm:

IPSS 0-7 (Mild) → Watchful Waiting
IPSS 8-19 (Moderate) → Medical Therapy (first-line)
IPSS 20-35 (Severe) / Failed medical therapy / Absolute indications → Surgery

---

A. WATCHFUL WAITING (Active Surveillance)

• For mild symptoms (IPSS ≤7) or moderate symptoms with minimal bother
• Lifestyle modifications:
  • Reduce fluid intake in evenings
  • Avoid caffeine and alcohol (bladder irritants)
  • Bladder retraining (timed voiding)
  • Treat constipation
  • Avoid drugs that worsen symptoms (antihistamines, decongestants)
• Reassess annually

---

B. MEDICAL THERAPY

1. Alpha-1 Adrenergic Blockers (Alpha-Blockers)

Q: Mechanism of alpha-blockers in BPH?

Block alpha-1 receptors in prostatic smooth muscle, bladder neck, and proximal urethra → reduce dynamic component of obstruction → improve urine flow within days to weeks

• Orthostatic hypotension (worst with non-selective)
• Floppy Iris Syndrome (IFIS) - CRITICAL: inform ophthalmologist before cataract surgery, especially with tamsulosin
• Retrograde ejaculation (most with silodosin ~28%)
• Dizziness, fatigue, nasal congestion

Q: What is IFIS and why is it important?

Intraoperative Floppy Iris Syndrome - tamsulosin causes alpha-1A blockade in iris dilator muscle → iris floppiness during cataract surgery → pupil constriction, iris prolapse, complications. Must inform ophthalmologist. Stopping tamsulosin before surgery does NOT reliably prevent it (effect persists months). Ophthalmologist uses modified surgical technique.

---

2. 5-Alpha Reductase Inhibitors (5-ARIs)

Q: Mechanism of 5-ARIs?

Block conversion of testosterone to DHT → reduce intraprostatic DHT → epithelial apoptosis → prostate volume reduction by 20-30% over 6-12 months

• Prostate volume >30-40 g (or PSA >1.5 ng/mL)
• Reduce risk of AUR and need for surgery (PLESS trial: finasteride reduced AUR by 57%, surgery by 55%)

• Decreased libido (~6%)
• Erectile dysfunction (~5%)
• Decreased ejaculatory volume
• Gynecomastia (~1%)
• PSA halved - remember: 5-ARIs reduce PSA by ~50% after 6 months; must double PSA to get true PSA equivalent

Q: A patient on finasteride has PSA of 2.5 ng/mL. What is his "true" PSA?

Multiply by 2 = 5 ng/mL equivalent. Failure of PSA to fall by 50% on 5-ARI should raise suspicion for prostate cancer.

---

3. Combination Therapy

• Best for men with moderate-severe LUTS + large prostate (>30 g) + high risk of progression
• MTOPS trial (Medical Therapy of Prostatic Symptoms): doxazosin + finasteride reduced clinical progression by 67% vs. monotherapy
• CombAT trial: dutasteride + tamsulosin superior to either alone for symptom improvement and reducing risk of AUR/surgery in men with prostate >30 g

---

4. Antimuscarinic / Anticholinergic Agents

• For storage/OAB symptoms (urgency, frequency, nocturia) predominant
• Tolterodine, Oxybutynin, Solifenacin, Darifenacin, Fesoterodine
• Caution: May precipitate urinary retention (use only when PVR <200 mL and Qmax >5 mL/s)
• Can be combined with alpha-blocker safely

---

5. Beta-3 Agonists

• Mirabegron - beta-3 agonist → bladder relaxation → storage symptom improvement
• Advantage over antimuscarinics: no dry mouth, less risk of urinary retention
• Can be used when antimuscarinics are contraindicated (glaucoma, constipation)

---

6. PDE-5 Inhibitors

• Tadalafil 5 mg daily - FDA approved for LUTS/BPH
• Mechanism: smooth muscle relaxation in prostate, bladder neck, urethra via cGMP
• Benefit: treats both LUTS and erectile dysfunction simultaneously
• Does NOT improve Qmax significantly

---

7. Phytotherapy (Plant Extracts)

• Serenoa repens (Saw palmetto), Pygeum africanum, beta-sitosterol
• Evidence is weak; NOT recommended by AUA/EAU guidelines as primary therapy
• May have mild symptomatic benefit in some trials

---

C. SURGICAL TREATMENT

Q: What is the GOLD STANDARD surgical treatment for BPH?

TURP (Transurethral Resection of the Prostate) - remains the gold standard benchmark against which all other procedures are compared.

---

1. TURP (Transurethral Resection of the Prostate)

• Prostate 20-80 g (most effective range)
• Failed medical therapy
• Absolute surgical indications (AUR, recurrent UTI, stones, renal impairment, hematuria)

• Monopolar TURP: uses glycine 1.5% or sorbitol/mannitol irrigation (non-conducting, hypotonic) - risk of TURP syndrome
• Bipolar TURP: uses normal saline irrigation - NO TURP syndrome - now preferred

Q: What is TURP syndrome? How do you prevent and treat it?

• Absorption of hypotonic irrigation fluid (glycine) through open venous sinuses
• Results in: hyponatremia, dilutional hyponatremia, hypervolemia, hypo-osmolarity
• Presentation: nausea, visual disturbances (glycine metabolite = ammonia), confusion, seizures, cardiovascular collapse
• Classically occurs when resection >1 hour and venous sinuses widely opened
• Prevention: limit resection time to <1 hour; bipolar TURP uses saline → eliminates syndrome
• Treatment: slow sodium correction, diuretics (furosemide), ICU monitoring; hypertonic saline if severe seizures

Q: What is the most common complication of TURP?

Retrograde ejaculation (~90%) - semen goes into bladder instead of being expelled antegrade due to disruption of bladder neck sphincter mechanism. This is NOT erectile dysfunction. Must be counseled pre-operatively.

---

2. Open Simple Prostatectomy (Enucleation)

• Very large prostate (>80-100 g) - when TURP too lengthy/risky
• Bladder stones, bladder diverticula requiring simultaneous repair
• Hip deformity precluding lithotomy position

---

3. Holmium Laser Enucleation of Prostate (HoLEP)

• Most effective endoscopic technique for any prostate size
• Holmium:YAG laser enucleates entire transition zone (similar to open enucleation but endoscopic)
• Advantages: size-independent (can treat even 200+ g prostates), minimal bleeding (suitable for anticoagulated patients), short catheter time, day-case procedure
• Disadvantage: steep learning curve (~50-100 cases)
• EAU guidelines: HoLEP is now recommended as alternative to TURP for ALL prostate sizes
• Requires morcellator to remove enucleated tissue

---

4. Laser Vaporization Techniques

---

5. Minimally Invasive Surgical Therapies (MIST)

---

6. Comparison Table: Surgical Options

---

CHAPTER 11: ACUTE URINARY RETENTION (AUR)

Q: A 70-year-old man presents with inability to void for 8 hours with lower abdominal pain and a palpable bladder. Management?

Definition:

Immediate Management:

1. Urethral catheterization (14-16 Fr) - immediate relief
2. If urethral catheterization fails → suprapubic catheterization
3. Drain bladder slowly (controversial: some drain all at once, some clamp at 500 mL - evidence does not support slow drainage to prevent hematuria)
4. Send urine for culture
5. Check serum creatinine (rule out acute obstructive uropathy)
6. Start alpha-blocker (tamsulosin) immediately

TWOC (Trial Without Catheter):

• Remove catheter after 24-72 hours on alpha-blocker
• Success rate: ~50-70% (better in first-time AUR with identifiable precipitant)
• Precipitated AUR (e.g., after surgery, anesthesia, overdistension) → higher success TWOC
• Spontaneous AUR → lower success

Predictors of Failed TWOC:

• Voided volume >1 liter at catheterization
• Large prostate (>30 g)
• Detrusor pressure <35 cmH₂O on urodynamics
• Prolonged retention (>7 days)
• Elderly with poor detrusor function

Failed TWOC → definitive surgical treatment (TURP)

---

CHAPTER 12: CHRONIC URINARY RETENTION (CUR)

Low-Pressure CUR:

• PVR >300 mL, no upper tract dilation, normal renal function
• Patient often not in distress
• May present with overflow incontinence

High-Pressure CUR:

• Raised intravesical pressure transmitted to upper tracts
• Bilateral hydronephrosis, bilateral hydroureter
• Impaired renal function (obstructive nephropathy)
• This is an absolute indication for immediate catheterization and surgery

Q: Post-obstructive diuresis - what is it and how do you manage it?

After relieving chronic high-pressure retention, kidneys excrete retained sodium, water, and urea → large volumes of dilute urine

• Monitor urine output hourly
• Replace 50-75% of urine output IV to avoid dehydration and electrolyte imbalance
• Monitor Na, K, urea, creatinine 6-hourly
• Usually self-limiting; pathological diuresis if >200 mL/hr persisting

---

CHAPTER 13: PSA IN BPH

Q: What is the role of PSA in BPH evaluation?

1. Predicts prostate volume: PSA 1.5-4 ng/mL → likely large prostate; supports 5-ARI use
2. Predicts risk of progression: PSA >1.5 ng/mL = high risk of AUR or surgery
3. Rules out concurrent prostate cancer (but overlap in PSA values)
4. 5-ARIs reduce PSA by 50% - must adjust interpretation
5. PSA density = PSA/prostate volume; >0.15 ng/mL/mL suggests cancer over BPH

PSA Ranges and BPH:

• Elevated PSA in BPH is due to: increased volume of PSA-producing epithelium, loss of basement membrane integrity, microinfarcts
• BPH PSA rarely >10 ng/mL (higher values → suspect cancer)

---

CHAPTER 14: DIFFERENTIAL DIAGNOSIS OF LUTS

Q: BPH is not the only cause of LUTS. What else causes similar symptoms?

---

CHAPTER 15: HIGH-YIELD EXAM QUESTIONS & MNEMONICS

Must-Know High-Yield Facts:

---

MNEMONICS:

• Detrusor decompensation / Diverticula (large)
• Infections (recurrent UTIs)
• Hematuria (recurrent)
• Evacuation failure (AUR - retention)
• Failure of kidneys (renal impairment)
• Stones (bladder stones)

• Frequency, Intermittency, Force (weak stream), Waiting (hesitancy), Straining, Nocturia + Incomplete emptying

• 5-ARIs = Shrink (size reduction, long-term, large prostates)
• Alpha-blockers = Smooth (smooth muscle relaxation, rapid relief)

---

CHAPTER 16: EXAMINER TRAPS & COMMON MISTAKES

1. "BPH is benign prostatic HYPERtrophy"

WRONG. It is HYPERplasia - increase in cell NUMBER. Hypertrophy = increase in cell SIZE. BPH is a histological diagnosis of hyperplasia.

2. "A large prostate always causes more obstruction"

WRONG. Size does NOT correlate with symptoms or degree of obstruction. A 200 g prostate may have mild LUTS; a 30 g prostate can cause severe BOO. Dynamic tone matters more.

3. "Stop tamsulosin before cataract surgery"

NOT sufficient. IFIS can persist for months after stopping. The ophthalmologist must be informed so they can modify technique. The key intervention is telling the surgeon, not stopping the drug.

4. "Correct hyponatremia rapidly in TURP syndrome"

WRONG. Rapid correction causes central pontine myelinolysis. Correct slowly (max 8-10 mEq/L per 24 hours).

5. "TURP cures erectile dysfunction"

WRONG. TURP causes ED in ~3-5%. It does NOT treat pre-existing ED.

6. "PSA is always elevated in BPH"

Not always. Normal PSA with large prostate does not exclude cancer. But PSA >10 in BPH alone is unusual.

7. "5-ARIs can be used immediately in AUR"

5-ARIs take 6-12 months to work; alpha-blockers are used for AUR/TWOC.

---

CHAPTER 17: CLINICAL VIGNETTES (EXAM-STYLE PRACTICE)

• Diagnosis: Moderate-severe BPH with BOO
• Treatment: Combination alpha-blocker + finasteride/dutasteride (large prostate, risk of progression); if fails → TURP

• IFIS risk - must inform ophthalmic surgeon. Modified surgical technique needed (iris hooks, Malyugin ring, OVD). Stopping tamsulosin does not reliably prevent IFIS.

• High-pressure CUR/AUR causing renal impairment → Absolute surgical indication
• Catheterize immediately; monitor for post-obstructive diuresis; optimize renal function; plan TURP once stable

• Retrograde ejaculation (90% incidence post-TURP)
• Semen goes back into bladder. Post-coital urinalysis/centrifuge shows sperm.
• If fertility desired: sympathomimetics (pseudoephedrine), sperm retrieval from post-ejaculatory urine, assisted reproduction

• TURP syndrome - stop procedure, secure airway, slow IV sodium correction, furosemide, ICU; if seizures → hypertonic saline (3%) cautiously

---

---