Can a new injection slow pulmonary arterial hypertension?

This trial is testing an experimental drug called HS235, given as a shot under the skin, in adults with pulmonary arterial hypertension (PAH), a condition where high blood pressure in the lungs makes it hard to breathe and can strain the heart. The study aims to see if adding HS235 to standard PAH treatments is safe and helps improve how well patients function. About 90 adults will be randomly assigned to receive either HS235 or a placebo, with different doses being evaluated. The main focus is on safety and how the drug affects the body, with the hope that it may offer a new way to manage this serious disease.