Stress Echocardiography in the Detection of Pulmonary Arterial Hypertension in Systemic Sclerosis Patients

Every patient will have both procedures; stress echocardiography and right heart catheterization. A positive stress echocardiography is defined as \>= 20 mmhg increase in the systolic pulmonary artery pressure (SPAP) (between rest and stress) or an absolute value \>= 55 mmhg. A positive right heart catheterization at rest is defined as a PAPm \>25mmhg, wedge \< 18 and pulmonary vascular resistances \>3 wood units. Stress catheterization will also be perform and is defined as a PAPm \> 30mmhg and wedge \<18 mm hg.