Fig. 2

A Intermittent monitoring of psoas muscle area in 54 critically ill patients with ARDS due to SARS-CoV-2 infection. Metrics were collected at at least three time points using an AI-based segmentation tool applied to routinely performed CT scans. B Depicted are two CT slices used to perform body composition analysis at the level of lumbar vertebra 3 and the respective magnifications for better visualization of the psoas muscle. These example measurements, taken on days 7 and 57 after hospital admission, are from a young patient (ID 32) who survived the infection. Within the 50 days separating the scans, there is a distinct decrease in area of the psoas (blue) and the autochthonous back muscles (green)