Assessment of oxygenation after balloon pulmonary angioplasty for patients with inoperable chronic thromboembolic pulmonary hypertension

To the editor, In response to: Assessment of oxygenation after balloon pulmonary angioplasty for patients with inoperable chronic thromboembolic hypertension. We read interest study by Matsuoka et al. [1] reporting on effects (BPA) tissue oxygenation. Despite an improvement in haemodynamics following BPA, authors conclude that oxygenation, exercise-induced desaturation (EID) and exertional dyspnoea (ED) did not improve. However, further examination results, while accounting exercise intensity, suggests EID may have improved post-BPA.