What are the steps of a simple nephrectomy?

Steps of Simple Nephrectomy

Simple nephrectomy involves the removal of the kidney for benign disease, and can be performed via open, laparoscopic transperitoneal, or laparoscopic retroperitoneal approaches, with the laparoscopic retroperitoneal approach offering the lowest morbidity for most benign indications 1, 2.

Preoperative Preparation

• Imaging: Obtain high-quality cross-sectional abdominal imaging (CT angiography preferred) to assess renal anatomy, vascular supply, and identify any anatomical variations 3
• Laboratory work: Complete metabolic panel, complete blood count, and urinalysis 4
• Patient positioning: Lateral decubitus position for both open and laparoscopic approaches

Surgical Approach Selection

The choice between transperitoneal and retroperitoneal laparoscopic approaches depends on:

• Retroperitoneal approach: Preferred for simple nephrectomy in benign disease due to lower morbidity, faster recovery (mean hospital stay 4.7 days), and avoidance of intraperitoneal complications 2
• Transperitoneal approach: Reserved for cases with extensive retroperitoneal scarring or when larger working space is needed 5

Key Surgical Steps

1. Access and Exposure

• Create retroperitoneal space or enter peritoneal cavity depending on approach
• Mobilize colon medially (for transperitoneal) or develop retroperitoneal space (for retroperitoneal approach)
• Identify and preserve ureter, gonadal vessels, and psoas muscle

2. Hilar Dissection - The Critical Step

For beginners, the "two-window technique" with en bloc hilar stapling is safer and avoids the need for meticulous intra-hilar dissection 6, 7, 8:

• Create lower pole window: Dissect inferior to the kidney to expose the lower aspect of the hilum
• Create upper pole window: Dissect superior to the kidney to expose the upper aspect of the hilum
• Isolate the hilum: With traction from both windows, the renal hilum becomes stretched and clearly defined
• En bloc hilar control: Apply vascular stapler across the entire hilum without individual vessel dissection

This technique minimizes risk of vascular injury and is particularly valuable for surgeons without extensive laparoscopic experience 8.

3. Alternative Hilar Management (Traditional)

For experienced surgeons performing individual vessel control:

• Identify renal artery first (typically posterior)
• Ligate renal artery with clips or suture ligature (never use non-transfixing clips alone) 3
• Identify and ligate renal vein
• Control any accessory vessels

4. Kidney Mobilization

• Divide peritoneal attachments (Gerota's fascia remains intact for simple nephrectomy)
• Mobilize kidney circumferentially
• Divide ureter distally with clips or stapler
• Free kidney from surrounding attachments

5. Specimen Extraction

• Extend port site or create separate extraction incision (typically 3-5 cm)
• Place kidney in extraction bag
• Remove specimen intact

6. Hemostasis and Closure

• Inspect operative field for bleeding
• Ensure no injury to surrounding structures (spleen, liver, pancreas, bowel)
• Place drain if indicated (not routine)
• Close port sites in layers

Technical Considerations

Hilar Control Safety

• Renal artery must be transfixed with suture ligature or secured with anchor staples within the vessel wall 3
• Non-transfixing clips (Hem-o-lok) should NOT be used alone for renal artery ligation due to risk of slippage and catastrophic bleeding
• En bloc stapling is acceptable and safer for novice surgeons 8

Laterality Considerations

• Left kidney: Preferred for donor nephrectomy due to longer renal vein, but this is less relevant for simple nephrectomy 3
• Right kidney: Shorter vein requires more careful dissection; may need to mobilize liver

Perioperative Outcomes

Based on large series of retroperitoneal laparoscopic simple nephrectomy 2:

• Mean operative time: 114 minutes (range 35-280 minutes)
• Mean blood loss: 97.6 mL (range 0-300 mL)
• Conversion rate: 3.4%
• Mean hospital stay: 4.7 days (range 2-13 days)

Common Complications and Pitfalls

Most frequent complications:

• Hemorrhage from hilar vessels (prevented by proper technique)
• Injury to surrounding organs (spleen, liver, pancreas, bowel)
• Vascular thrombosis in patients with arteriovenous fistulas or polycystic disease 2

Critical pitfalls to avoid:

• Premature hilar dissection before adequate exposure increases bleeding risk
• Using non-transfixing clips alone on renal artery
• Failure to identify accessory renal vessels (present in up to 30% of patients)
• Injury to adrenal gland or adrenal vein during upper pole dissection

Postoperative Management

• Monitor for bleeding (drain output, hemoglobin)
• Early mobilization (same day or postoperative day 1)
• Remove drain when output <50 mL/day
• Discharge typically postoperative day 2-5 for laparoscopic approach

The retroperitoneal laparoscopic approach with the two-window technique and en bloc hilar stapling represents the safest and most reproducible method for simple nephrectomy, particularly for surgeons building their laparoscopic experience 7, 8, 2.