A stress test evaluates a patient’s heart under conditions of physical activity. It analyzes the blood supply to the heart muscle and also provides information about the condition of the heart. Additionally, it can evaluate abnormalities of cardiac rhythm. During the test, electrodes are placed on the patient’s chest and his/her EKG is recorded while at rest, then while walking on a treadmill at varying speeds and elevations, and then following exercise. The patient’s blood pressure is also monitored regularly during the test.