Heart surgery monitoring under the microscope: is the standard test reliable?

This study looks at whether a standard way to measure pressure in the heart's left chamber (using a balloon-tipped catheter) gives the same results as the most accurate method (directly measuring pressure in the left atrium). The researchers will study 136 adults having heart surgery to see how well these two measurements match under different conditions. The goal is to improve monitoring and treatment decisions for patients with heart failure or fluid buildup in the lungs.