MRCP2-4364
A 38-year-old man presents to the Emergency department with a one week history of a non-productive cough and increasing breathlessness. He reports his breathing is much worse on exertion. His past medical history includes migraines and childhood asthma (but he has not used any inhaler in almost 30 years). He works in the pharmaceutical industry and often travels to India and Africa with work.
Examination reveals mild pyrexia of 37.8°C. Investigations are as follows: Hb 134 g/L (130-180), WBC 3.3 ×109/L (1.5-7), Plt 177 ×109/L (150-400), CRP 78 mg/L (<10), pH 7.35 (7.35-7.45), pO2 6.5 kPa (11.3-12.6), pCO2 5.8 kPa (4.7-6.0), LDH 310 U/L (10-250), CXR shows bilateral patchy infiltrates. What would be the most appropriate initial treatment regimen given the likely diagnosis?