The study limitations, the authors state, include the fact that theirs was a single-center study that enrolled participants infected early during the COVID-19 pandemic and did not include patients with Delta or Omicron variants, thus limiting the generalizability of the findings.
The study was published in Radiology.
The reported findings “indicate a long-term impact on bronchiolar obstruction,” states Brett M. Elicker, MD, professor of clinical radiology, University of California, San Francisco, in an accompanying editorial . Because collagen may be absorbed for months after an acute insult, it is not entirely clear whether the abnormalities seen in the current study will be permanent. He said further, “the presence of ground glass opacity and/or fibrosis on CT were most common in the patients admitted to the ICU and likely correspond to post-organizing pneumonia and/or post-diffuse alveolar damage fibrosis.”
Dr. Elicker also pointed out that organizing pneumonia is especially common among patients with COVID-19 and is usually highly steroid-responsive. The opacities improve or resolve with treatment, but sometimes residual fibrosis occurs. “Longer-term studies assessing the clinical and imaging manifestations 1-2 years after the initial infection are needed to fully ascertain the permanent manifestations of post-COVID fibrosis.”
The study was supported by grants from the National Institutes of Health. The authors and Dr. Elicker have disclosed no relevant financial relationships.
A version of this article first appeared on Medscape.com.