Symptomatic Respiratory Virus Infection and Chronic Lung Allograft Dysfunction

Area of Science:

• Pulmonology
• Transplantation Immunology
• Infectious Diseases

Background:

• Chronic lung allograft dysfunction (CLAD) is a primary cause of lung allograft loss.
• Previous studies on respiratory virus infection (RVI) and CLAD were limited by outdated diagnostic methods and smaller cohorts.
• This study investigates the association between symptomatic RVI and CLAD in a large, contemporary cohort of lung transplant recipients (LTRs).

Purpose of the Study:

• To examine the association between symptomatic respiratory virus infection (RVI) and the development of chronic lung allograft dysfunction (CLAD).
• To utilize modern diagnostic techniques for a more accurate assessment in a large cohort of lung transplant recipients.
• To analyze the time-dependent risk of CLAD following RVI episodes.

Main Methods:

• Retrospective analysis of clinical data from 250 lung transplant recipients.
• Assessment of variables including acute rejection, cytomegalovirus pneumonia, and upper/lower RVI.
• Multivariate Cox models were employed to determine the independent association between RVI and CLAD, considering time-dependent risk.

Main Results:

• CLAD was diagnosed in 20% of patients (50/250) at a median of 95 weeks post-transplantation.
• Respiratory virus infections (RVI) occurred in 32% of patients (79/250), with 114 total episodes.
• Both RVI (aHR 1.9; P=.03) and rejection (aHR 2.2; P=.01) were independently associated with CLAD. The risk of CLAD increased with shorter time intervals post-RVI.

Conclusions:

• Symptomatic respiratory virus infection (RVI) is an independent risk factor for chronic lung allograft dysfunction (CLAD) in lung transplant recipients.
• The risk of developing CLAD is higher in closer temporal proximity to an RVI episode.
• Further prospective studies are needed to elucidate the virologic factors and mechanisms underlying CLAD development post-RVI.