Case history/examination
This was a single-center, retrospective, observational case series. An isolated field hospital for COVID-19 patients was constructed in Kanagawa prefecture next to Shonan Kamakura General Hospital, which managed this temporary hospital. The target patients were patients with and without oxygen demand but were elderly, having underlying disease that can be considered as risks of COVID-19 including pulmonary disease, cardiovascular disease, chronic kidney disease, diabetes mellitus, and others 2 3. Patients requiring intubation were transferred to other hospitals that were specialized in the treatment of severely ill patients. Patients who did not wish to undergo intubation stayed at this hospital.