| Completed | 2 | 80 | Europe | Hyperbaric oxygen, HBO, HBO2, HBOT, Sham treatment, Placebo | Karolinska University Hospital, Karolinska Institutet, Karolinska Trial Alliance, EDC Scandinavia AB, Swedish Heart Lung Foundation, Region Stockholm, The Swedish Research Council | COVID-19, Post COVID-19 Condition, Post COVID-19 Condition, Unspecified, Post COVID Condition, Post-COVID Syndrome, Post-Acute COVID-19 Syndrome | 09/23 | 06/24 | | |