Clinical characteristics of the nine patients included in the study
| # | Alive at ICU discharge | Alive at 28 days | Age | Sex | SAPS II | Pulmonary ARDS (yes/no) | PaO2/FiO2 (mm Hg) | PCO2(mm Hg) | VT/kg (mL/kg) | PEEP (cmH2O) | Plateau pressure (cmH2O) | Driving pressure (cmH2O) | Compliance (mL/cmH2O) |
| 1 | N | N | 75.0 | F | 54 | N | 185.2 | 33.7 | 7.2 | 13 | 33.5 | 20.5 | 17.0 |
| 2 | N | Y | 62.0 | M | 45 | Y | 137.6 | 40.5 | 7.0 | 16 | 24.8 | 8.8 | 50.0 |
| 3 | N | N | 62.0 | M | 37 | Y | 93.0 | 57.0 | 7.5 | 13 | 27.3 | 14.3 | 39.0 |
| 4 | Y | Y | 50.4 | F | 26 | Y | 190.6 | 46.6 | 4.8 | 18 | 27.0 | 9.0 | 33.3 |
| 5 | Y | Y | 71.0 | M | 54 | Y | 197.1 | 42.5 | 7.3 | 12 | 22.9 | 10.9 | 44.0 |
| 6 | Y | Y | 73.0 | M | 47 | Y | 180.0 | 44.6 | 7.0 | 10 | 18.0 | 8.0 | 62.5 |
| 7 | Y | Y | 74.0 | M | 51 | Y | 217.3 | 53.2 | 6.8 | 10 | 17.0 | 7.0 | 64.0 |
| 8 | Y | Y | 71.0 | F | 69 | N | 149.3 | 33.5 | 11.6 | 9 | 18.0 | 9.0 | 55.5 |
| 9 | Y | Y | 59.0 | M | 39 | Y | 120.2 | 61.3 | 5.1 | 15 | 31.0 | 16.0 | 24.0 |
All patients were imaged within a week from the time of intubation. Ventilator settings and physiological parameters, including gas exchange and respiratory mechanics were previously chosen by the treating clinicians and were not changed at the time of imaging.
ICU, intensive care unit; PCO2, partial pressure of carbon dioxide; PaO2/FiO2,ratio of partial pressure arterial oxygen and fraction of inspired oxygen; PEEP, positive end-expiratory pressure; SAPS: Simplified Acute Physiology Score; VT, tidal volume.