Imaging and Diagnostic Testing The St. Mary's Heart Center's team of specialists employ a full range of tests to make an accurate diagnosis of your situation. Now, patients at St. Mary’s with heart rhythm problems can now get valuable information in determining the cause. St. Mary's Heart Center is now using new technology from Biotroniks. A small loop recorder is inserted under the skin of the chest. The recorder continuously collects information about a patient’s heart rhythm and automatically makes an ECG recording when an arrhythmia occurs. tand inserting a small loop recorder under the skin of the chest The recorder does not require any leads to the heart and can record a heart’s rhythm for a few months, to a few years. Angiography Cardiac-Specific PET scan Carotid Doppler Coronary CT Echocardiography Electrocardiogram – EKG/ ECG Event Recorders Lower Extremity Arterial and Venous Testing Nuclear Stress Test Stress Echocardiography Tilt Testing