A 76-year-old man presented to his GP complaining of a 6-week history of worsening shortness of breath, dry cough, and fatigue. Upon further questioning, the patient reveals he now has to stop multiple times on his daily walk to the shops to catch his breath and has been sleeping with another pillow at night to help with his breathing. The patient has a past medical history of hypertension and has a 30 pack-year smoking history. He is currently prescribed ramipril, amlodipine and atorvastatin.On examination the GP notes end-inspiratory crackles at both lung bases. Oxygen saturation is measured at 94% on room air, his pulse is 110 /min and regular and his respiratory rate is 24 /min.What is the most likely underlying diagnosis?

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