Prone positioning in severe ARDS

What the study found

PROSEVA (New England Journal of Medicine, 2013) randomly assigned patients with severe acute respiratory distress syndrome to prone positioning — turned face-down for long daily sessions — or to standard supine (face-up) care, both on top of lung-protective ventilation. The group treated with prone positioning had substantially lower mortality than the group left supine.

Why it matters

In ARDS, injured lungs flood and collapse unevenly, and much of the collapse concentrates in the parts of the lung nearest the back when a patient lies face-up. Turning the patient face-down redistributes air and blood flow more evenly, reducing the harmful mechanical stress the ventilator places on the lung. PROSEVA turned prone positioning from an occasional last-resort rescue into an evidence-based standard for severe ARDS — and it uses no drug or device, just repositioning.

Analysis — the pattern

Alongside lung-protective ventilation (this is analysis), prone positioning reinforces a core critical-care theme: the biggest ARDS survival gains have come from reducing harm and using the lungs gently, not from new medicines. Proning was adopted widely during the COVID-19 pandemic. Which patients benefit most, and the optimal timing and duration, are still being refined.

What is still uncertain

Proning is labor-intensive and carries real risks such as dislodging breathing tubes and lines or causing pressure injuries. It typically means keeping a patient face-down for many hours at a stretch, so results depend on experienced teams, and the clearest benefit is in severe ARDS with correct patient selection.