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Abstract Introduction Impaired lung function has been observed in patients following COVID‐19 infection, with studies reporting persistent lung volume and diffusing capacity impairments. Some studies have demonstrated significantly higher small airway resistance in COVID‐19 positive cases. This retrospective study aims to examine impulse oscillometry (IOS) data of patients with persistent symptoms after COVID‐19 infection, focusing on the relationship between time and symptoms. Material and Method The study analyzed data from adult patients with persistent symptoms who underwent IOS testing within and after 84 days from the diagnosis date. Result The results showed that patients within 84 days and those between 31 and 84 days had higher small airway resistance values, indicating peripheral airway disease. Patients with dyspnea exhibited higher IOS values compared to those with cough symptoms, suggesting more significant impairment in the peripheral airways. Conclusion The study highlights the importance of using comprehensive diagnostic tools like IOS to assess respiratory impairments in post‐COVID‐19 patients, particularly in the small airways. Understanding the relationship between time and symptoms can provide valuable insights for the treatment of peripheral airway dysfunction in post‐COVID‐19 patients.
Lu et al. (Sat,) studied this question.