A Covid-19 patient at the Royal Brompton Hospital AICU (Adult Intensive Care Unit) is carefully moved through the corridors to have a CT scan to check lung function. The patient remains connected to an ECMO (Extracorporeal Membrane Oxygenation) machine throughout the procedure.

ECMO treatment is a rare last resort for patients who, even after ventilation, have blood oxygenation levels too low to sustain them. Blood is drawn from the body, oxygenated artificially and then returned.