Background: High diagnostic accuracy for pneumonia, absence of radiation exposure and repeatability are intrinsic features of lung ultrasonography making it an attractive tool in the assessment of patients with COVID-19 pneumonia. The aim of our prospective, observational study was to detect COVID-19-associated sonographic features and assess the potential value of LUS in predicting adverse events.
Methods: From March 12th to April 20th 2020 patients admitted to two medium-intensive wards with a discharge diagnosis of COVID-19 pneumonia were enrolled and underwent lung ultrasonography. The prognostic value of several ultrasonographic scores at admission and after 72 hours from the first examination (the total score, the anterolateral score, the number of positive region and the presence of consolidation) were analysed with logistic regression along with other potential prognostic factors. The primary outcome was a composite of death and transfer to Intensive Care Unit (ICU), while the secondary was continuous positive airways pressure (CPAP) support.
Results: 190 patients were enrolled in the study. The primary outcome was seen in 25 patients (13%), the secondary outcome in 36 (22%). At multivariate regression no sonographic score at admission was independently correlated with the primary outcome while the total score, the anterolateral score, the number of positive regions were associated with CPAP support. When considering the subgroup of patients undergoing lung ultrasonography after 72 hours (128 patients) the total score was independently associated with both the primary and secondary outcome.
Conclusion: Lung ultrasonography can be a promising prognostic tool in patients admitted to non-ICU units for COVID-19 pneumonia.