Pulmonary arteriovenous malformation as a cause of severe exertional dyspnoea

A 48-year-old woman presented to the respiratory clinic with progressive ex ertional dyspnoea and an abnormal chest radiograph. Examination revealed mu cosal telangiectasia and pulmonary angiography confirmed the presence of tw o pulmonary arterial venous malformations (PAVM). After therapeutic coil em bolisation, dyspnoea was markedly improved, and exercise tolerance increase d. Comparison of exercise test responses before and after this therapeutic intervention provides new insights into the physiological mechanisms of exe rtional dyspnoea in this condition.