Validation of a Non-invasive Assessment of Central Venous Oxygen Saturation by Using MRI

Inclusion Criteria: Age \> 18 years Ability to follow the study according to study protocol General ability to consent Presence of a written consent of the study participant Patients with a clinical indication for right heart catheterization Exclusion Criteria: Age \<18 years. Pregnancy (for women of childbearing age, a pregnancy test is performed if pregnancy is possible) or breastfeeding. Any condition that interferes with informed decision making General MRI exclusion criteria (pacemaker, defibrillator, intracranial aneurysm clips, metallic foreign bodies in the eyes) Any MRI exclusion criteria not listed here as determined by the performing MRI laboratory. Hemodynamically unstable patients (heart rate \< 50/min, systolic blood pressure \< 90 mmHg, circulatory support devices: IABP, Impella) Complex supra- or ventricular arrhythmia occurring at rest or on exertion Right ventricular thrombus Recent pulmonary embolism Pulmonary instability (oxygen depletion or peripheral oxygen saturation \<90%) Chronic lung disease (FEV\< 35% on spirometry) Claustrophobia Sensorineural hearing loss from 30 dB and tinnitus