Abstract
There are few studies that have investigated the response to the prone position in mechanically ventilated COVID-19 patients with acute respiratory distress syndrome (ARDS). We describe the characteristics and outcomes of those patients in atertiary hospital in Spain. This is an observational study in consecutive, mechanically ventilated COVID-19 patients. The primary endpoint was to describe the respiratory pathophysio-logy and clinical outcomes of COVID-19 patients treated by mechanical ventilation in the prone position. Of 84 patients mechanically ventilated in the prone position, 19 (22%) were successfully extubated and 43 (51%) were discharged from the ICU. The duration of mechanical ventilation and ICU length of stay were 11 days (IQR 8-16) and 15 days (IQR 9-25), respectively. On admission to ICU, 61% patients had amoderate ARDS according to the Berlin criteria. 76% had 4 lung quadrants affected. After intubation, the median PaO2/FiO2 was 105 (IQR 76-138), ventilatory ratio was 1.48 (IQR 1.16-1.88), and compliance was 33 mL cm H 2 O-1 (IQR 25-41). The median number of cycles in the prone position was 2 (1-3), with amedian of total hours in the prone position of 76 (IQR 64-111).72 h after the first prone position cycle the median PaO2/FiO2 increase was up to 193 (IQR 152-251), but the compliance was similar to the basal level (34 mL cm H 2 O-1 [IQR 26-43]). However, the percentage of patients with normal compliance (> 50 mL cm H 2 O-1) increased with the prone position from 15% (n = 13) to 32% (n = 27) after 72 h. In our study, the COVID-19 patients with respiratory failure presented respiratory mechanics, gas exchange parameters, and aresponse to prone ventilation similar to those observed in other causes of ARDS.
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