The goal of this clinical trial is to determine whether sotatercept is effective in improving diffusing capacity in patients with pulmonary arterial hypertension.
Participants will be asked to:
* Take Sotatercept every 21 days (3 days)
* Each participant will be enrolled in the study for 29 Weeks
* Visit the clinic 15 times
* Have a physical exam
* Perform assessments of lung function and exercise tests
* Have an ultrasound of their heart
* Have blood draws done at regular intervals
The main objectives of the study are:
Primary objective: To assess whether sotatercept will improve recruitment of diffusing membrane capacity (DM) with exercise.
Secondary objective: To identify components of the diffusing capacity that respond to treatment with sotatercept in pulmonary arterial hypertension.