Complete Urology Exam Answer: Renal/Ureteric Stone Surgery

1. INCISIONS FOR PYELOLITHOTOMY - Tabular Format

Key exam point (Hinman's Atlas): "A flank incision is made below either the 11th or 12th rib depending on the position of the kidney." For pyelolithotomy, the patient is positioned in the lateral decubitus (flank) position with the kidney bridge elevated and the table flexed.

Key exam point (Smith & Tanagho): "The proximal ureter may be approached with a dorsal lumbotomy. An incision lateral to the sacrospinalis muscles allows medial retraction of the quadratus lumborum. The anterior fascicle of the dorsal lumbar fascia must be incised to gain proper exposure despite the appearance of potentially opening the peritoneum."

2. INCISIONS FOR OPEN URETEROLITHOTOMY - By Level

Source (Hinman's): "Proximal ureter: a supracostal, subcostal, or flank incision provides optimal exposure. Alternatively, a lumbotomy can be used for proximal stones. Distal ureter: stones distal to the ureter crossing the iliac vessels can be approached extraperitoneally via a low midline, Pfannenstiel, or Gibson incision."

3. HIGH DRAIN OUTPUT AFTER RENAL/URETERIC SURGERY - Management

First - Confirm what the drain output contains

• Send the drain fluid for creatinine level
• If drain creatinine > serum creatinine (typically >2x) = urinary leak

Step-by-Step Management Algorithm

• Low output (slowly decreasing) = conservative management likely sufficient
• High output (>100-200 mL/day, not decreasing) = active leak, needs intervention

• Keep the drain in situ - do NOT remove it prematurely
• Ensure the Foley catheter is in place and draining freely (decompress the bladder)
• Keep the ureteral stent (if placed) patent and functioning
• Check ureteral stent position on X-ray if obstruction is suspected

Source (Hinman's Atlas, post-pyelolithotomy): "The Jackson-Pratt drain is removed when output is less than 50-100 mL over 24 hours." This is the threshold for safe drain removal.

Source (Hinman's Atlas, open ureterolithotomy): "The Foley catheter can be removed on postoperative day 1, and the drain can be removed 24 hours later if output is low."

Key principle to state in exam:

4. DIFFERENCE BETWEEN DRAIN AND NEPHROSTOMY TUBE

Key exam sentence:

Quick Summary for Viva Defence

Complications of TURP - Complete Exam Answer

Classification of TURP Complications

Immediate (Intraoperative)

Early (Within 30 days)

Late (After 30 days)

1. TUR SYNDROME (Most Imp - Favourite Examiner Question)

• Resection time >90 minutes (Smith & Tanagho)
• Large gland with many open venous sinuses
• Raised intravesical pressure (irrigant bag too high)
• Hypotonic irrigants (distilled water, glycine, sorbitol)
• Capsular perforation

• Neurological: nausea, vomiting, confusion, agitation, visual disturbances, seizures, coma
• Cardiovascular: hypertension (early), bradycardia, then hypotension
• Specific to glycine: transient blindness (glycine acts on retinal glycine receptors)

• Halt surgery if >1000 mL absorbed (males), >750 mL (females)
• Terminate surgery if >2000 mL absorbed (males), >1000-1500 mL (females)
• With saline: terminate after >2500 mL absorbed

Exam pearl: "Rate of Na correction must not exceed 8-10 mEq/L per day to avoid osmotic demyelination syndrome (central pontine myelinolysis)."

Bipolar TURP: Uses normal saline as irrigant, eliminating the risk of hypo-osmolar hyponatremia. Volume overload can still occur with prolonged resection (Campbell-Walsh).

2. HEMORRHAGE

• Incidence ~8% requiring transfusion (older database studies) (Hinman's)
• Bipolar electrosurgery has reduced intraoperative hemorrhage significantly
• Causes: opening of large venous sinuses, arterial bleeders

• Occurs within first few weeks
• Sloughing of eschar covering resected vessels
• Management: Large-bore catheter (24 Fr or larger) + hand irrigation with catheter-tip syringe to evacuate clots → continuous bladder irrigation (CBI) → bleeding usually stops in 24-48 hours without return to OT (Hinman's)

3. CAPSULAR PERFORATION / EXTRAVASATION

• Extravasation of irrigating fluid into periprostatic tissue and space of Retzius
• More common with aggressive resection technique
• Clinical sign: Suprapubic tension/distension during or after TURP
• Management (Hinman's):
  • 2-cm transverse suprapubic incision → Kelly clamp "popped" through fascia above pubic bone → spread 2 cm in space of Retzius → evacuates bloody fluid → leave 3/4-inch Penrose drain through fascial opening → remove next day

4. RETROGRADE EJACULATION

• Incidence: 75% (Smith & Tanagho)
• Hinman's calls it "an inevitability, not a complication" because bladder neck is deliberately resected
• Mechanism: Resection of bladder neck destroys sympathetic-mediated closure of internal sphincter during ejaculation → semen passes retrograde into bladder
• Counselling is mandatory pre-operatively

5. ERECTILE DYSFUNCTION (IMPOTENCE)

• Incidence: 5-10% (Smith & Tanagho)
• Mechanism: Thermal injury or pressure on cavernous nerves, psychological, or pre-existing vascular disease
• Usually not caused by standard TURP if resection stays proximal to verumontanum

6. URINARY INCONTINENCE

• Incidence: >1% (Smith & Tanagho)
• Two types (Hinman's):
  • Detrusor overactivity (DO) / urge incontinence: Pre-existing from bladder outlet obstruction; usually resolves over weeks-months as bladder remodels after obstruction relief; may persist for several months
  • Intrinsic sphincter deficiency (ISD) / stress incontinence: From overly aggressive apical resection below verumontanum, or unmasking of pre-existing sphincter weakness (esp. post-radiotherapy, post-brachytherapy)

Exam pearl: "The verumontanum is the anatomical landmark protecting the external sphincter. Resection should stop at or just proximal to the verumontanum to avoid sphincter damage."

7. URETHRAL STRICTURE / BLADDER NECK CONTRACTURE

• Incidence mentioned by Smith & Tanagho as a recognized complication
• Urethral stricture: from endoscope trauma, especially at the meatus or bulbar urethra
• Bladder neck contracture: from overly aggressive bladder neck resection, especially in small prostates where scarring/fibrosis causes later contracture
• Hinman's advises: "If the prostate is small, consider TUIP which preserves the bladder neck tissue and minimizes bladder neck contracture"

8. URINARY TRACT INFECTION / SEPSIS

• From bacteriuria pre-operatively, instrumentation, or catheter
• Prophylactic antibiotics mandatory pre-operatively
• Persistent infection post-TURP may indicate residual adenoma or abscess

9. RECTAL INJURY (Rare, Serious)

• Most common in: re-do prostatectomy, post-radiation patients where tissue planes are obliterated (Hinman's)
• Small rectal injury: Non-operative - urethral drainage + bowel rest + antibiotics
• Persistent fistula (rectourethral fistula): Diverting colostomy + fistula repair (staged approach)

10. DEEP VEIN THROMBOSIS / PULMONARY EMBOLISM

• Patient in prolonged lithotomy position
• Prevention: Sequential compression devices, early mobilization

Summary Table for Quick Viva Recall

Key Exam Points to State Confidently

1. "Bipolar TURP uses normal saline as irrigant, eliminating hypo-osmolar TUR syndrome but volume overload risk remains." (Campbell-Walsh)
2. "Spinal anaesthesia is preferred for TURP because the awake patient can report early symptoms of TUR syndrome (nausea, confusion, visual changes)." (Hinman's + Miller's)
3. "Treatment of TUR syndrome: furosemide for free water diuresis; hypertonic 3% saline only if Na <120 mEq/L and symptomatic; magnesium for seizures when glycine is the cause."
4. "Resection must remain proximal to the verumontanum to protect the external (rhabdosphincter) sphincter and prevent permanent incontinence."
5. "Retrograde ejaculation occurs in 75% - patient must be counselled pre-operatively. It is a consequence of the procedure, not a surgical error."

Types of Surgical Drains - Complete Exam Answer

Diagram from Bailey & Love (Fig 7.20)

(a) Open drain - corrugated drain; (b) Closed active suction drain with vacuum bottle; (c) Closed passive non-suction drain - Robinson's drain)

Primary Classification (Bailey & Love)

DRAINS
├── OPEN DRAINS (Passive, gravity-based)
└── CLOSED DRAINS
    ├── Active (Suction / Suctioned)
    └── Passive (Non-suctioned)

Detailed Classification Table

Individual Drains - Detailed Description

1. Penrose Drain

• Type: Open, passive
• Material: Soft, flat latex rubber tube (like a collapsed tube)
• Mechanism: Wicks fluid to the surface by capillary action + gravity
• Use: Abscess cavities, debrided infected wounds
• Named after: Charles Bingham Penrose (American gynaecologist)
• Disadvantage: Open to environment - highest infection risk; needs frequent dressing changes

2. Corrugated Drain

• Type: Open, passive
• Material: Corrugated (ribbed/ridged) rubber or plastic sheet
• Mechanism: The ridges create channels along which fluid tracks to the surface (capillary action)
• Use: Superficial wound drainage, debrided wounds, abscess beds
• Difference from Penrose: Corrugated has ridged surface creating multiple channels; Penrose is a flat tube

3. Robinson Drain

• Type: Closed, passive, non-suction
• Material: Soft silicone or PVC tube with multiple side holes
• Mechanism: Gravity and capillary action; closed system - connects to a drainage bag
• Use: Abdominal cavity drainage (prevents suction on omentum/viscera), post-cholecystectomy, pelvic drainage
• Advantage over open drains: Closed system reduces infection risk

4. Jackson-Pratt (JP) Drain

• Type: Closed, active (suction), negative pressure
• Material: Flat, perforated, grenade/bulb-shaped silicone drain connected to a collapsible bulb
• Mechanism: Bulb is compressed and re-connected - creates sustained negative pressure; actively sucks fluid
• Use: Post-pyelolithotomy, post-nephrectomy, mastectomy, liver surgery
• Key fact (Hinman's): "JP drain removed when output is less than 50-100 mL over 24 hours"

5. Redivac / Hemovac Drain

• Type: Closed, active (suction)
• Material: Perforated tube connected to a rigid vacuum bottle (Redivac) or a flat coiled drain with spring-loaded disc (Hemovac)
• Mechanism: Pre-compressed vacuum container maintains sustained negative suction
• Use: Orthopaedic surgery (hip/knee arthroplasty), head & neck, mastectomy
• Difference from JP: Larger reservoir; Hemovac has a disc that is compressed to create suction; Redivac uses a sealed glass/plastic vacuum bottle

6. Sump Drain (Shirley / Yeates)

• Type: Closed, active, double-lumen
• Material: Outer large drainage lumen + inner smaller air-inlet lumen
• Mechanism: Fluid drains out through outer lumen while air enters through inner lumen (prevents suction effect, maintains continuous flow); can also allow lavage
• Use: Pancreatic fistula, large infected cavities, high-output fistulae where irrigation is needed
• Advantage: Does not block; allows continuous lavage if needed

7. T-Tube

• Type: Closed, passive
• Material: Latex or silicone T-shaped tube
• Mechanism: Placed in common bile duct (CBD) after exploration; short arms sit inside CBD, long arm exits through abdominal wall; bile drains passively into bag
• Use: Post-CBD exploration for choledocholithiasis
• Removed when: Cholangiogram (T-tube cholangiogram) at day 10-14 shows no leak and free flow to duodenum

8. Intercostal Chest Drain (ICD)

• Type: Closed, passive (underwater seal) or active (with suction)
• Material: Firm PVC tube (24-32 Fr) inserted through intercostal space
• Mechanism: Underwater seal creates one-way valve; air/fluid exits pleural space on expiration but cannot re-enter
• Use: Pneumothorax, haemothorax, empyema, post-thoracic surgery
• Landmark: 5th intercostal space, mid-axillary line ("safe triangle")

9. Nephrostomy Tube

• Type: Closed, passive/active diversion tube
• Material: Soft malecot or pigtail catheter placed percutaneously into renal pelvis under ultrasound/fluoroscopy
• Mechanism: Diverts urine directly from kidney before it reaches obstructed or injured ureter
• Use: Ureteric obstruction, post-ureterolithotomy urine leak, pyonephrosis

Properties of an Ideal Drain (Bailey & Love)

• Be non-irritating to surrounding tissues
• Be non-reactive (inert material)
• Drain effectively without blockage
• Not act as a conduit for infection
• Be easy to remove without fragmentation

Indications for Surgical Drain (Bailey & Love)

• Anticipated collection of blood/serum/lymph (e.g. axillary dissection, hernia repair)
• Dead space obliteration

• Established abscess/collection drainage
• Controlled fistula - transforms an uncontrolled internal leak into a controlled external fistula
• Biliary or urinary leak monitoring

Arguments For and Against Routine Drain Use (Bailey & Love)

Quick Summary Table for Viva