MRCP2-4381
An 87-year-old man presents with a three-month history of increasing shortness of breath. He lives with his wife and is typically independent, but he is currently recovering from a hospitalization six months ago for pneumonia. He has lost 10kg in weight since before the admission, but denies any fevers or night sweats. He reports a constant dry cough and tightness in his chest at times. He takes ramipril for hypertension and has a history of childhood tuberculosis, but has never smoked.
On examination, he appears frail and has bilateral crepitations in the left mid and upper zones and right middle and lower zones. His respiratory rate is 24 breaths/min and his saturation is 92% at rest, dropping to 86% on standing with purple lips. He has a palpable heave and bilateral ankle swelling. His B-natriuretic peptide is within normal limits, but his CRP is elevated. His FEV1 is 87% predicted and his FVC is 75% predicted. His ECG shows right bundle branch block with a sinus rate of 70/min. His chest X-ray reveals reticular shadows bilaterally with reduced chest expansion.
An arterial blood gas in air shows a pH of 7.35, PaO2 of 7.9 kPa, PaCO2 of 6.8 kPa, and HCO3 of 28 mmol/l.
What is the most likely diagnosis?