The added value of cardiopulmonary exercise testing in the follow-up of pulmonary arterial hypertension.
BACKGROUND: The added value of cardiopulmonary exercise testing (CPET) in the follow-up of patients with stable pulmonary arterial hypertension (PAH) remains undefined. METHODS: Idiopathic, heritable, and drug-induced PAH patients free from clinical worsening (CW) after 1 year of treatment were enrolled in derivation (n?=?80) and validation (n?=?80) cohorts at an interval of 6 years and followed for 3 years.