Figure 1.

Clinical course of seven patients with COVID-19 and pre-existing interstitial lung diseases: respiratory support and steroid therapy. Abbreviations: AE, acute exacerbation; AMI, acute myocardial infarction; D, discharge; d, day; DM, dermatomyositis; DNAR, do not attempt resuscitation; ILD, interstitial lung disease; IPF, idiopathic pulmonary fibrosis; IPPV, invasive positive-pressure ventilation; L, last follow-up; HFNO, high-flow nasal oxygen; PSL, prednisolone; RA, rheumatoid arthritis; UC, unclassifiable; UNK, unknown cause; UNK-S, unknown respiratory support; UNK-T, unknown steroid therapy. Initial Tx means initial steroid therapy including methylprednisolone pulse therapy and post-pulse steroid therapy, as shown in Table 2. Periods during which Cases 1, 2, and 3 were treated for intensive respiratory support in the other hospitals are shown by bold squares.