1. Able and willing to give signed informed consent prior to enrollment

2. Male or female, ≥ 18 years of age

3. Diagnosis of SSc according to 2013 ACR/EULAR SSc Classification Criteria (van den Hoogen 2013): Score ≥ 9.

4. Patients with RHC data available from measurement within 3 weeks prior to TPD assessment

5. No change in or initiation of PAH specific therapy between the last RHC and TPD

Detecting Pulmonary Arterial Hypertension (PAH) in Patients With Systemic Sclerosis (SSc) by Ultrasound