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Zonal NephRo Score: external validation for predicting complications after open partial nephrectomy.

M C Kriegmair1, P Mandel2, A Moses3

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Summary
This summary is machine-generated.

The Zonal NePhRO Score (ZNS) effectively predicts complications in open partial nephrectomies (OPNs). Higher ZNS scores correlate with longer ischemia times, increased collecting system openings, and reduced kidney function post-surgery.

Keywords:
ComplicationsOpen partial nephrectomyValidationZonal NephRo Score

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Area of Science:

  • Urology
  • Nephrology
  • Surgical Oncology

Background:

  • Open partial nephrectomy (OPN) is a standard procedure for kidney tumor removal.
  • Accurate assessment of tumor complexity is crucial for predicting surgical outcomes and complications.
  • The Zonal NePhRO Score (ZNS) was previously developed to quantify renal tumor complexity.

Purpose of the Study:

  • To externally validate the Zonal NePhRO Score (ZNS) as a predictor of perioperative complications and outcomes in patients undergoing open partial nephrectomies (OPNs).
  • To assess the ZNS's superiority over other nephrometry scores in predicting OPN outcomes.

Main Methods:

  • A retrospective analysis of 200 consecutive patients who underwent OPN was conducted.
  • Preoperative CT or MRI scans were analyzed to stratify tumor complexity using the ZNS (low, moderate, high).
  • Univariate and multivariate logistic regression models identified predictors of perioperative complications and surgical parameters.

Main Results:

  • The ZNS score was significantly associated with higher complication rates (OR 1.25), longer ischemia times (β = 1.19), decreased eGFR post-surgery (β = -1.86), and increased collecting system openings (OR 1.72).
  • Tumor complexity was graded as low in 19.8%, moderate in 50.3%, and high in 29.9% of cases.
  • Age and BMI were also identified as independent predictors of complications.

Conclusions:

  • This study provides the first external validation of the ZNS for predicting perioperative complications in OPN.
  • A higher ZNS score is a reliable indicator of increased operative difficulty, longer ischemia times, and adverse postoperative renal outcomes.
  • The ZNS is a valuable tool for surgical planning and patient counseling in OPN procedures.