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A 93-year-old male with COPD, hypertension and stroke presented to the emergency department with cough and dyspnoea. Two months before this episode, he had suffered a compression fracture and therefore received first and second lumbar vertebroplasty with cement implantation. In the emergency department, his oxygen saturation was 88% while breathing ambient air; his other vital signs were normal. Physical examination revealed crackles over his bilateral lung field.
A laboratory test revealed leucocytosis and a mild elevation of the C reactive protein level. A chest …