Comparing encounter-based and annualized chronic pseudomonas infection definitions in cystic fibrosis

Area of Science:

• Pulmonology
• Infectious Diseases
• Clinical Microbiology

Background:

• Chronic Pseudomonas aeruginosa (Pa) infection significantly increases morbidity and mortality in cystic fibrosis (CF) patients.
• Current definitions for chronic Pa infection in CF lack a universally accepted gold standard.
• Accurate identification of chronic Pa infection is crucial for effective CF management.

Purpose of the Study:

• To compare the validity of different definitions for chronic Pseudomonas aeruginosa (Pa) infection in cystic fibrosis (CF) patients.
• To evaluate an annualized definition for chronic Pa infection against established encounter-based criteria.
• To determine the utility of an annualized chronic Pa definition for longitudinal studies in CF cohorts.

Main Methods:

• Comparison of encounter-based (modified Leeds criteria) and annualized chronic Pa definitions.
• Analysis of data from the Early Pseudomonas Infection Control (EPIC) Observational study cohort.
• Validation of annualized definitions across multiple US CF cohorts spanning several decades.

Main Results:

• An annualized definition requiring Pa+ culture in 3 of 4 years (Green 3/4) demonstrated comparable chronic Pa metrics to modified Leeds criteria.
• The Green 3/4 definition showed similar age of onset and proportion of patients meeting chronic Pa criteria.
• A similar proportion of patients maintained sustained Pa infection after meeting the Green 3/4 definition.

Conclusions:

• The Green 3/4 annualized definition provides a reliable metric for chronic Pa infection in CF.
• This definition is particularly valuable for longitudinal analyses in CF cohorts with infrequent culture data.
• The Green 3/4 definition offers a standardized approach to defining chronic Pa infection in CF research.