Pulmonary artery disease

This study tests whether a contrast-enhanced ultrasound can measure the amount of blood in the lungs during exercise, which might reflect heart pressures without needing an invasive catheter. Researchers will compare this ultrasound measurement with the standard invasive pressure…

This trial tests whether breathing supplemental oxygen during exercise helps people with pulmonary vascular disease walk farther compared to breathing regular air. Participants will perform a standard six-minute walk test twice—once with oxygen and once without—to see if oxygen i…

This trial asks whether breathing supplemental oxygen during a 6-minute walk test helps people with pulmonary vascular disease (PAH or CTEPH) walk farther than they would on ambient air. Participants will complete two walk tests—one with oxygen via nasal cannula and one without—t…

This study at Mayo Clinic looks at how changes in the blood vessels of the lungs affect people with heart valve disease. Researchers will use echocardiograms during routine heart catheterization to measure these changes in 600 adults scheduled for valve procedures. The goal is to…

This study compares noninvasive heart ultrasound (echocardiogram) with the standard invasive right heart catheterization in 3000 people referred for catheterization. The goal is to see if ultrasound can accurately measure heart function and blood flow during exercise. Participant…