Assessment of Peripheral Veins Doppler Ultrasound for Diagnosis of Acute Right Heart Failure in Suspicion or Follow-up of Pulmonary Hypertension

Inclusion Criteria: * Adult patient (age ≥ 18 years old) * Patient referred to the cardiology department for a right heart catheterization with measurement of RAP, regardless of the indication. * Free subject, without guardianship or curatorship or subordination * People affiliated to or beneficiary of a social security schemes * Informed consent signed by the patient after clear and fair information about the study. Exclusion Criteria: * Minor patient (age \< 18 years) * Refusal to participate in the study * Patient with hemodynamic instability, unable to tolerate a delay in treatment caused by the ultrasound examination. * Patient requiring diuretic treatment within the next 4 hours * Patient with a life expectancy of less than 24 hours. * History of proximal deep venous thrombosis involving the inferior vena cava and/or common iliac veins and/or femoral veins. * History of extrinsic venous compression on the inferior vena cava and/or common iliac veins and/or femoral veins. * Persons who do not benefit from a Social Security scheme or who do not benefit from it through a third party. * Persons benefiting from reinforced protection, namely minors, pregnant and nursing women, persons deprived of liberty by a judicial or administrative decision, persons staying in health or social institutions, adults under legal protection and finally patients in emergency situations.