Characterization of Baseline Lung Allograft Dysfunction in Single Lung Transplant Recipients

Area of Science:

• Pulmonary Medicine
• Transplantation Immunology
• Critical Care Medicine

Background:

• Baseline lung allograft dysfunction (BLAD) is a known complication after double lung transplantation (DLTX), impacting patient survival.
• Limited data exists on BLAD definition, risk factors, and outcomes in single lung transplantation (SLTX).

Purpose of the Study:

• To define BLAD criteria for SLTX recipients.
• To investigate the impact of BLAD on allograft survival in SLTX.
• To identify risk factors associated with BLAD in SLTX.

Main Methods:

• Retrospective analysis of 141 SLTX recipients from 2010-2018.
• BLAD defined as <60% FEV1/FVC on two tests >3 weeks apart, mirroring DLTX criteria.
• Survival and regression analyses were conducted to identify predictors.

Main Results:

• 43% of SLTX recipients met BLAD criteria.
• BLAD was associated with significantly impaired allograft survival.
• Native lung hyperinflation (obstructive disease) and donor/recipient size mismatch (obstructive/restrictive disease) were identified as risk factors.

Conclusions:

• BLAD is a significant concern in SLTX, comparable to DLTX, and warrants careful monitoring.
• Risk factors for BLAD differ based on the underlying lung disease (obstructive vs. restrictive).
• Understanding these factors is crucial for developing targeted preventive strategies in lung transplant recipients.