Evaluating Lung Doppler Signals in Patients With Systemic Sclerosis (SSc)

Inclusion Criteria:

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

Exclusion Criteria:

1. People unable or unwilling to give informed consent.
2. PCWP or LVEDP > 15 mmHg
3. Any PH etiology outside Group 1 (Dana Point, 2008)
4. Pregnant women
5. Patients having severe chest wall deformity