Lung Function Impairment after Mild SARS-CoV-2 Infection in Previously Healthy Individuals.

Area of Science:

• Pulmonology
• Infectious Diseases
• Longitudinal Health Studies

Background:

• Dyspnea is a common and poorly understood symptom of Post-COVID Syndrome (PCS).
• The physiological underpinnings of PCS-related dyspnea require further investigation.
• Previous research has not fully elucidated the role of lung function in PCS.

Purpose of the Study:

• To investigate the physiological basis of dyspnea in Post-COVID Syndrome.
• To analyze lung function parameters in relation to dyspnea and PCS severity.
• To explore the longitudinal changes in lung function among PCS patients.

Main Methods:

• Analysis of the prospective, multicenter, population-based COVIDOM study cohort.
• Inclusion of 936 healthy adults assessed ≥6 months post-SARS-CoV-2 infection.
• Comprehensive pulmonary function testing including spirometry, body plethysmography, DLCO, and oscillometry (AOS); dyspnea assessed via questionnaires.

Main Results:

• Dyspnea prevalence significantly increased with PCS severity (19.3% to 81.8%).
• Small airway dysfunction (SAD) was more frequent in participants with high PCS severity and dyspnea (37% vs. 25%).
• No significant longitudinal differences in lung function, including SAD measures, were found between persistent dyspnea and asymptomatic groups.

Conclusions:

• Oscillometry-derived R5-R20Hz showed significant differences between dyspneic PCS patients and controls.
• The high frequency and lack of longitudinal improvement in SAD suggest potential clinical relevance in PCS assessment.
• Further research is needed to understand the long-term impact of SAD on PCS-related dyspnea.