Self-proning in COVID-19 patients on low-flow oxygen therapy. A cluster randomised controlled trial

Rationale and objectives Prone positioning as a complement to oxygen therapy to treat hypoxemia in coronavirus disease (COVID-19) pneumonia in spontaneously breathing patients has been widely adopted, despite a lack of evidence for its benefit. To test the hypothesis that a simple incentive to self-prone for a maximum of 12 h per day would decrease oxygen needs in patients admitted to the ward for COVID-19 pneumonia on low-flow oxygen therapy. Methods Twenty-seven patients with confirmed COVID-19 pneumonia admitted to Geneva University Hospitals were included in the study. Ten patients were randomised to self-prone positioning and 17 to usual care. Measurements and Main Results Oxygen needs assessed by oxygen flow on nasal cannula at inclusion were similar between groups. Twenty-four hours after starting the intervention, the median oxygen flow was 1.0 L·min−1 (interquartile range, 0.1–2.9) in the prone position group and 2.0 L·min−1 (interquartile range, 0.5–3.0) in the control group (p=0.507). Median oxygen saturation/fraction of inspired oxygen ratio was 390 (interquartile range, 300–432) in the prone position group and 336 (interquartile range, 294–422) in the control group (p=0.633). One patient from the intervention group who did not self-prone was transferred to the high-dependency unit. Self-prone positioning was easy to implement. The intervention was well tolerated and only mild side-effects were reported. Conclusions Self-prone positioning in patients with COVID-19 pneumonia requiring low-flow oxygen therapy resulted in a clinically meaningful reduction of oxygen flow, but without reaching statistical significance.