Lung allograft rejection: diagnosis and management

Area of Science:

• Immunology
• Transplantation Medicine
• Pulmonology

Background:

• Rejection is a frequent complication following lung transplantation.
• It significantly impacts long-term patient outcomes.
• Understanding rejection mechanisms is crucial for improving graft survival.

Purpose of the Study:

• To review the diverse clinical presentations of rejection post-lung transplantation.
• To provide an updated overview of recent advancements in the field.
• To identify key risk factors for poor outcomes.

Main Methods:

• Literature review of recent studies on lung transplant rejection.
• Analysis of updated grading schemes for lymphocytic bronchiolitis.
• Evaluation of emerging evidence on humoral immunity's role.
• Assessment of proposed new classifications of allograft dysfunction.

Main Results:

• The 2007 updated grading for lymphocytic bronchiolitis confirms its role as an independent risk factor for chronic rejection.
• Humoral immunity's contribution to lung transplant rejection is increasingly recognized but not fully understood.
• A novel subtype, neutrophilic reversible allograft dysfunction, has been proposed based on azithromycin treatment response.

Conclusions:

• Acute rejection and lymphocytic bronchiolitis are significant predictors of chronic rejection.
• Chronic rejection remains the principal barrier to improved long-term results in lung transplantation.
• Further research is needed to elucidate the role of humoral immunity and refine management strategies.