A 37-year-old man, previously well, presented to the same-day emergency clinic with a several-month history of persistent dry cough. He reported no chest pain, exertional dyspnoea, palpitations, syncope, or other cardiorespiratory symptoms. His antenatal and childhood history was unremarkable. Clinical examination showed stable vital signs, normal heart sounds without murmurs, and no cyanosis, clubbing, or oedema. Lung auscultation was normal.