Right Heart Catheterization
A right heart catheterization is performed to determine how well the heart is pumping and to measure the pressures in the heart and lungs.

In a right heart cath, the doctor guides a special catheter (a small, hollow tube) called a pulmonary artery (PA) catheter to the right side of the heart and passes it into the pulmonary artery, the main artery carrying blood to the lungs. The doctor observes blood flow through the heart and measures the pressures inside the heart and in the lungs.