Résumé : Persistent obstruction in the pulmonary artery following acute pulmonary embolism (PE) can give rise to both chronic thromboembolic pulmonary hypertension (CTEPH) and chronic thromboembolic disease without PH (CTED). We hypothesised that cardiopulmonary exercise testing (CPET) may be able to differentiate patients with CTEPH and CTED following unresolved PE which may help guide patient assessment.