Our doctors at the Phoenix Diagnostic clinic may suggest you get an electrocardiogram, also known as ECG, to check for signs of heart-related diseases. It is basically a test that records the electrical activity of your ticker through tiny electrode patches that are attached to the skin of your chest, arms as well as legs. With this test, the doctor will be able to check your heart rhythm, diagnose a heart attack and also check on things that are slightly abnormal such as thickened heart muscle.