The road to real zero ischemia for partial nephrectomy.

Area of Science:

• Urology
• Surgical Oncology
• Nephrology

Background:

• Partial nephrectomy is the gold standard for small renal masses.
• Minimizing warm ischemia time during partial nephrectomy is crucial for preserving renal function.
• The off-clamp technique aims to achieve zero ischemia during retroperitoneal partial nephrectomy (RPN).

Purpose of the Study:

• To evaluate the initial outcomes of retroperitoneal partial nephrectomy (RPN) performed using an off-clamp excision technique.
• To assess the feasibility and safety of the modified zero ischemia technique in RPN.

Main Methods:

• Retrospective analysis of 19 patients with T1 posterior renal masses or renal convexity undergoing RPN between January 2011 and October 2102.
• Patients were selected for the modified zero ischemia technique.
• Data collected included patient characteristics, operative details, complications, and outcomes. Analysis included comparison of initial cases versus later cases to assess the learning curve.

Main Results:

• The off-clamp procedure was successfully performed in 79% of patients (15/19).
• Mean tumor size was 35 mm with a mean PADUA score of 9.
• Later cases showed decreased estimated blood loss (EBL), shorter surgical time, and reduced hospital stay compared to initial cases, indicating a learning curve benefit.

Conclusions:

• Preliminary results suggest that off-clamp RPN is a promising approach for nephron-sparing surgery with potential for zero ischemia.
• The technique demonstrates a learning curve effect, with improved outcomes in later cases.
• Larger, randomized studies are recommended to validate these initial findings.