Comparing two imaging methods to guide heart device placement

This study is testing the best way to choose the correct size of a heart device called a left atrial appendage occluder, which is implanted during heart rhythm surgery. Researchers are comparing two imaging methods—CT scans and a special type of X-ray called DSA—to see which one helps doctors select the right device size more accurately. You would be randomly assigned to receive one of these imaging methods before your procedure.

Patients with irregular heartbeat often need both heart rhythm treatment and a device to seal off a small pouch in the heart to prevent stroke. Choosing the right device size is critical for the treatment to work well, and doctors want to know which imaging method gives them the most accurate measurements.