Clinical features associated with chronic lung allograft dysfunction progression in a multicenter cohort.

Area of Science:

• Pulmonary Medicine
• Transplantation Immunology
• Clinical Outcomes Research

Background:

• Chronic lung allograft dysfunction (CLAD) is a major cause of lung transplant failure.
• Current phenotyping methods for CLAD are inconsistent and lack standardization.
• Predicting outcomes in lung transplant recipients with CLAD requires objective measures.

Purpose of the Study:

• To determine if routine clinical measures at CLAD diagnosis predict graft loss.
• To analyze the impact of CLAD stage, timing, and lung function decline on transplant outcomes.
• To identify objective markers for stratifying CLAD progression risk.

Main Methods:

• Analysis of a prospective multicenter cohort (Lung Transplant Outcomes Group) of 2386 adult lung recipients.
• Definition of probable CLAD using International Society for Heart and Lung Transplantation criteria.
• Cox models adjusted for covariates to assess time from CLAD onset to graft loss, examining CLAD stage, early onset, FVC loss, and FEV1/FVC ratio.

Main Results:

• Probable CLAD occurred in 59.4% of patients; most presented with stage 1 CLAD and early onset.
• Higher CLAD stage (≥2), early-onset CLAD, and FVC loss were significantly associated with increased hazard of graft loss.
• A reduced FEV1/FVC ratio (<0.7) was paradoxically associated with a lower risk of graft loss.

Conclusions:

• Routine, objective clinical measures at CLAD onset effectively predict progression to graft loss.
• Stratifying CLAD based on objective measures is crucial for patient prognostication.
• These findings can inform the design of future clinical trials for CLAD interventions.