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Published on: October 11, 2024
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Lung size mismatch and primary graft dysfunction after bilateral lung transplantation
Michael Eberlein1, Robert M Reed2, Servet Bolukbas3
1Division of Pulmonary, Critical Care and Occupational Medicine, University of Iowa Hospitals and Clinics, Iowa City, Iowa.
Summary
Oversized donor lungs in bilateral lung transplantation (BLT) are linked to a reduced risk of primary graft dysfunction (PGD). This protective effect is more pronounced in patients without chronic obstructive pulmonary disease (COPD).
Area of Science:
- Thoracic Surgery
- Transplantation Immunology
- Pulmonary Medicine
Background:
- Lung size matching, estimated by predicted total lung capacity (pTLC) ratio, is crucial in lung transplantation (LTx).
- The association between pTLC ratio and primary graft dysfunction (PGD) risk after bilateral LTx (BLT) requires further investigation.
Purpose of the Study:
- To determine if the pTLC ratio influences the risk of PGD following BLT.
- To analyze the impact of lung size mismatch on PGD within specific diagnostic categories.
Main Methods:
- Utilized data from 812 adult BLTs (March 2002-December 2010) from the Lung Transplant Outcomes Group.
- Stratified patients into "oversized" (pTLC ratio >1.0) and "undersized" (pTLC ratio ≤1.0) groups.
- Defined PGD as ISHLT Grade 3 PGD (PGD3) within 72 hours; employed multivariable conditional logistic regression to assess risk factors.
Main Results:
- Univariate analysis showed oversizing was associated with a 39% lower odds of PGD3 (OR 0.61, p=0.003).
- Multivariable analysis confirmed oversizing independently decreased PGD3 odds (OR 0.58, p=0.01).
- The association between oversizing and reduced PGD3 risk was significant in non-COPD patients (OR 0.52, p=0.01) but not in COPD patients (OR 0.72, p=0.5).
Conclusions:
- Oversized allografts are associated with a reduced risk of PGD3 after BLT.
- This beneficial effect of lung oversizing is particularly evident in patients transplanted for non-COPD indications.
