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A z score (or standardized value) is measured in units of the standard deviation. It tells you how many standard deviations the value x is above (to the right of) or below (to the left of) the mean, μ. Values of x that are larger than the mean have positive z scores, and values of x that are smaller than the mean have negative z scores. If x equals the mean, then x has a zero z score. It is important to note that the mean of the z scores is zero, and the standard deviation is one.
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Donor Posterior Atrial Flap Rotation for Left Atrial Cuff Reconstruction in Lung Transplantation
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Objective Donor Scoring System for Lung Transplantation.

William M Whited1, Jaimin R Trivedi1, Victor H van Berkel1

  • 1Department of Cardiovascular and Thoracic Surgery, University of Louisville, Louisville, Kentucky.

The Annals of Thoracic Surgery
|October 13, 2018
PubMed
Summary
This summary is machine-generated.

A new lung donor scoring system helps predict transplant survival. This tool, combined with recipient risk scores, aids surgeons in selecting donors to improve patient outcomes after lung transplantation.

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Area of Science:

  • Transplantation immunology
  • Thoracic surgery
  • Biostatistics

Background:

  • Estimating post-lung transplant survival is challenging without objective donor risk assessment.
  • Current methods lack a standardized approach to quantify donor-related risks.

Purpose of the Study:

  • To develop and validate a simple scoring system for lung allograft donors.
  • To assess the association between donor risk score and post-transplant survival.
  • To evaluate the utility of the donor risk score in conjunction with recipient risk for optimizing transplant outcomes.

Main Methods:

  • Utilized the United Network for Organ Sharing (UNOS) thoracic transplant database (2005-2015).
  • Developed a Cox proportional hazard model to identify significant donor risk factors for survival.
  • Calculated a cumulative donor risk score and categorized donors into low, intermediate, and high-risk groups.
  • Validated the score using Kaplan-Meier survival analysis and the Lung Allocation Score (LAS) for recipient risk.

Main Results:

  • Donor risk score significantly correlated with 1- and 5-year post-transplant survival rates (p < 0.001).
  • 1-year survival: 85% (low-risk donors) vs. 77% (high-risk donors).
  • 5-year survival: 53% (low-risk donors) vs. 42% (high-risk donors).
  • Optimal survival observed in low-risk donor/low-risk recipient combinations (59% at 5 years).
  • Poorest survival in high-risk donor/high-risk recipient combinations (30% at 5 years).

Conclusions:

  • The developed lung donor scoring system provides an objective and user-friendly method for donor selection.
  • Integrating the donor risk score with the Lung Allocation Score can enhance recipient-donor matching.
  • This approach has the potential to optimize long-term outcomes for lung transplant recipients.