Concern over 'silent' oxygen deprivation prompts new approach to virus

Silent hypoxia is “quite newly observed but also quite significantly concerning”, said Jeremy Rossman, lecturer in virology at the University of Kent. Although telling people to self-isolate at home helps curtail the spread of the virus, some cases of serious illness are being “missed” until people are “critically unwell,” he said. A Covid-19 guide published by the UK’s health service in April warned that “‘silent hypoxia’ is common”, though the NHS could not provide any data to support the claim. A guide published by a group that represents London doctors said pulse oximeters — simple, clip-on-the-finger devices that measure oxygen — could be “a very useful tool in helping to monitor and assess patients”. In Brazil, Esper Kallas, an infectologist and professor at the University Hospital of São Paulo, said that by the middle of April: “We had begun to see a lot of people arriving at the hospital when they were already very sick. Most of them didn’t know they had hypoxia and were not feeling any shortage of breath.”