Airway oscillometry parameters in baseline lung allograft dysfunction: Associations from a multicenter study.

Area of Science:

• Pulmonary Medicine
• Transplant Surgery
• Respiratory Physiology

Background:

• Baseline lung allograft dysfunction (BLAD) after lung transplant (LTx) is linked to poorer survival.
• The physiological underpinnings of BLAD remain incompletely understood.
• Airway oscillometry offers a method to assess respiratory system mechanics.

Purpose of the Study:

• To characterize airway oscillometry parameters in stable LTx recipients with and without BLAD.
• To examine oscillometry parameters in LTx recipients with chronic lung allograft dysfunction (CLAD) and BLAD.
• To determine the association between oscillometry parameters and BLAD in LTx recipients.

Main Methods:

• A multi-center, cross-sectional study involving bilateral LTx recipients.
• Concurrent airway oscillometry and spirometry were performed.
• Multivariable logistic regression analyzed the association between oscillometry and BLAD.

Main Results:

• Lower reactance (Xrs5) Z-score was independently associated with BLAD in stable LTx recipients (aOR 0.50).
• Lower reactance (Xrs5) Z-score was also associated with BLAD in recipients with CLAD (aOR 0.73).
• 404 LTx recipients performed oscillometry; 253 were included in the analysis.

Conclusions:

• Airway oscillometry provides novel physiological insights into BLAD mechanisms.
• Abnormal respiratory mechanics, specifically elastance, is a key feature of BLAD.
• Further longitudinal studies are warranted to track oscillometry parameters and allograft outcomes.