Right ventricular function is a key determinant of survival in patients with pulmonary arterial hypertension, with right heart failure being the leading cause of death. ERS/ESC guidelines recommend evaluating RV function at diagnosis and at first reevaluation under treatment to estimate the one-year mortality risk. However, few RV function markers address both systolic function and afterload. Noninvasive myocardial work is a promising new tool that incorporates systolic function and its afterload into global longitudinal strain. Initially developed for the left ventricle, it can be adapted for the RV using pressure-strain loops. The article aims to evaluate the association of RV myocardial work parameters with the estimate one-year mortality in patients with PAH. This retrospective study will include patients diagnosed with PAH with transthoracic echocardiography and right heart catheterization within 48 hours at diagnosis and first reevaluation. Patients with unanalyzable echocardiography data will be excluded.