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Correlation between preoperatively predicted and postoperatively observed renal function using an imaging-based

Jingchao Liu1, Chuanxin Tian1, Zhaocun Zhang1

  • 1Department of Urology, Qilu Hospital of Shandong University, Jinan, Shandong 250012, P.R. China.

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Summary
This summary is machine-generated.

This study developed a new imaging-based method to predict kidney function after partial nephrectomy. The novel Function Index (FI) accurately correlated with observed kidney function, aiding in surgical planning.

Keywords:
CTGFRPNwarm ischemia

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Area of Science:

  • Nephrology
  • Urology
  • Medical Imaging

Background:

  • Partial nephrectomy (PN) is a standard treatment for kidney tumors.
  • Accurate prediction of postoperative renal function is crucial for patient management.
  • Current methods for predicting renal function post-PN have limitations.

Purpose of the Study:

  • To develop and validate an imaging-based method for preoperative prediction of renal function after PN.
  • To introduce a new metric, the Function Index (FI), to quantify preserved renal parenchyma.
  • To assess the correlation between predicted and observed renal function post-PN.

Main Methods:

  • Retrospective analysis of 128 patients undergoing PN.
  • Estimation of defected renal volume (Vdef) and preoperative renal volume (Vpre) from CT scans.
  • Calculation of Function Index (FI) = 0.5 * ((Vpre - Vdef) / Vpre + 1).
  • Calculation of estimated glomerular filtration rate (eGFR) using the Modification of Diet in Renal Disease Study equation.
  • Prediction of postoperative eGFR by multiplying preoperative eGFR by FI.
  • Correlation and multivariate regression analyses to assess predictive accuracy.

Main Results:

  • The median FI was 94% for unilateral and 97% for bilateral kidney surgery.
  • Predicted GFR showed significant correlation with immediate postoperative GFR (R²=0.594) and late postoperative GFR (R²=0.828).
  • Preoperative GFR and warm ischemia time were independent predictors of immediate postoperative function.
  • FI and preoperative GFR were independent predictors of late postoperative renal function.

Conclusions:

  • The developed imaging-based approach using the Function Index (FI) can reliably predict renal function after partial nephrectomy.
  • FI is a significant independent predictor of long-term renal function following PN.
  • This method offers a valuable tool for preoperative assessment and patient counseling.