Laparoscopic partial nephrectomy: predictors of prolonged warm ischemia

Area of Science:

• Urology
• Nephrology
• Surgical Oncology

Background:

• Warm ischemia during partial nephrectomy poses risks for acute and long-term kidney damage.
• A threshold of 30 minutes of warm ischemia time is often associated with increased renal injury.

Purpose of the Study:

• To identify patient and tumor characteristics that predict prolonged warm ischemia time (WIT) during laparoscopic partial nephrectomy.
• To develop a predictive model for WIT exceeding 30 minutes.

Main Methods:

• Prospective data from patients undergoing laparoscopic partial nephrectomy with renal vessel clamping were analyzed.
• Multivariate linear and logistic regression analyses assessed associations between WIT and preoperative/surgical parameters.
• A preoperative nomogram was developed and validated to predict WIT > 30 minutes.

Main Results:

• Tumor size, body mass index (BMI), and central tumor location were independent predictors of longer WIT.
• Patients with multiple risk factors (BMI > 30, tumor > 4 cm, central location) were 5 times more likely to experience WIT > 30 minutes.
• The developed nomogram demonstrated 75.4% accuracy in predicting prolonged WIT.

Conclusions:

• Increased tumor size, central tumor location, and higher BMI are significantly associated with longer WIT.
• A nomogram incorporating these factors allows for accurate preoperative prediction of prolonged WIT (> 30 minutes).
• This predictive tool can aid in surgical planning and risk stratification for partial nephrectomy.