Size Mismatching Increases Mortality After Lung Transplantation in Preadolescent Patients

Area of Science:

• Pediatric surgery
• Transplantation immunology
• Thoracic surgery

Background:

• The impact of donor-recipient size mismatch in pediatric lung transplantation (PLTx) remains unclear.
• Adult studies suggest oversized allografts improve lung transplant outcomes.
• This study quantifies the effect of size mismatch on pediatric posttransplant outcomes.

Purpose of the Study:

• To investigate the relationship between donor-recipient size mismatch and outcomes in pediatric lung transplantation.
• To determine if allograft size impacts survival rates in children undergoing PLTx.
• To compare findings in pediatric lung transplantation with existing adult data.

Main Methods:

• Utilized the United Network of Organ Sharing database for preadolescent PLTx recipients (<13 years).
• Calculated donor-to-recipient height, weight, and predictive total lung capacity (pTLC) ratios.
• Employed multivariate Cox regression and Kaplan-Meier survival analysis to assess mismatch effects on mortality.

Main Results:

• Size mismatching (height and weight) was associated with increased 1-year mortality in pediatric lung transplant recipients.
• A predictive total lung capacity (pTLC) ratio <0.9 significantly correlated with worse survival post-transplant.
• Contrary to adult findings, oversized allografts (pTLC ratio >1.1) did not demonstrate improved survival in children.

Conclusions:

• Size mismatch significantly increases mortality risk in pediatric lung transplantation.
• Findings contradict adult studies, indicating that oversized allografts do not benefit pediatric recipients.
• Prioritizing well-matched donor-recipient pairs is crucial for optimizing survival in pediatric lung transplantation.