Laparoscopic partial nephrectomy under warm ischemia reduces the glomerular density in a pig model

Area of Science:

• Nephrology
• Surgical Pathology
• Experimental Surgery

Background:

• Partial nephrectomy is a common procedure for kidney tumors.
• Warm ischemia is a necessary component of laparoscopic partial nephrectomy.
• The impact of warm ischemia on nephron number and kidney function requires further investigation.

Purpose of the Study:

• To quantify nephron number using unbiased stereology after warm ischemia.
• To evaluate the effects of warm ischemia during laparoscopic partial nephrectomy in a porcine model.

Main Methods:

• Laparoscopic partial nephrectomy was performed on 14 pigs, resecting 25% of kidney length.
• Kidneys were analyzed after 2 weeks, comparing ipsilateral (ischemic) and contralateral (non-ischemic) sides, plus controls.
• Stereological methods quantified glomerular volume and density; serum creatinine was measured.

Main Results:

• Warm ischemia resulted in increased mean glomerular volume and decreased glomerular density in the ipsilateral kidney.
• No significant difference in serum creatinine levels was observed pre- and post-surgery.
• Stereological measurements showed no differences between control and contralateral kidneys.

Conclusions:

• Stereological determination of glomerular density is a reliable method for assessing ischemic renal damage.
• Warm ischemia during laparoscopic partial nephrectomy leads to a significant reduction in glomerular density in the remaining renal parenchyma.