Influence of 3D-Calculated Parenchymal Volume Loss on Renal Function After Partial Nephrectomy

Area of Science:

• Nephrology
• Urology
• Radiology

Background:

• Partial nephrectomy (PN) is a standard treatment for renal tumors.
• Assessing factors influencing post-PN glomerular filtration rate (GFR) is crucial for patient outcomes.
• Renal parenchymal loss is a key concern after PN.

Purpose of the Study:

• To evaluate determinants of GFR decrease after PN.
• To identify clinical, tumoral, and surgical factors associated with GFR loss.
• To analyze predictors of renal parenchymal loss post-PN.

Main Methods:

• Retrospective analysis of 86 patients undergoing PN with pre- and post-operative CT scans.
• Three-dimensional (3D) volume segmentation to calculate kidney and tumor volumes.
• Evaluation of patient age, procedure type, comorbidities, GFR, tumor characteristics, RENAL score, and ischemia time.

Main Results:

• Mean renal parenchymal loss was 22.3%, and mean GFR loss was 17.3%.
• Renal parenchymal loss correlated with age, Charlson comorbidities index, and RENAL nephrometry score.
• Older age, higher comorbidity index, greater parenchymal loss, and higher RENAL score independently predicted GFR loss.

Conclusions:

• RENAL score and Charlson comorbidities index are strong predictors of postoperative parenchymal loss.
• Preservation of renal volume and remnant parenchyma quality impacts long-term GFR.
• Understanding these factors aids in optimizing surgical planning and patient management after PN.