title: Pneumonitis complicating low-dose methotrexate therapy in rheumatoid arthritis.
abstract: Three of 95 patients with rheumatoid arthritis who were being treated with low-dose (5 to 15 mg/wk) methotrexate sodium developed the clinical, radiographic, and pathologic features of methotrexate-associated pulmonary injury. Marked hypoxemia emphasized the severity of illness in our patients; lowest oxygen pressure values for each patient were 35 mm Hg, 42 mm Hg, and 45 mm Hg. The management of our patients with a pulmonary toxic reaction to methotrexate included discontinuing the drug treatment, antibiotic therapy until an infectious cause was excluded, and high-dose methylprednisolone. Two patients recovered and one died. Contrary to an earlier report that suggested that pneumonitis occurred only with methotrexate sodium doses exceeding 15 mg/wk, our three cases demonstrate that a severe pulmonary toxic reaction may also complicate low-dose weekly methotrexate therapy of rheumatoid arthritis.
mesh_terms: D001172:Arthritis, Rheumatoid / Q000150:complications* / Q000188:drug therapy; D004334:Drug Administration Schedule; D005260:Female; D006801:Humans; D007166:Immunosuppressive Agents / Q000009:adverse effects; D008297:Male; D008727:Methotrexate / Q000009:adverse effects* / Q000627:therapeutic use; D008775:Methylprednisolone / Q000627:therapeutic use; D008875:Middle Aged; D011658:Pulmonary Fibrosis / Q000139:chemically induced* / Q000188:drug therapy
chemical_list: D007166:Immunosuppressive Agents; D008775:Methylprednisolone; D008727:Methotrexate