Comprehensive Cardiac Testing Services — In addition to nuclear and echocardiography studies, DuPage Medical Group offers a complete range of other noninvasive cardiac testing. These tests electronically monitor heart activity over an extended period of time. While methods may differ, the overall goal of all cardiac testing is to obtain a thorough understanding of your heart. Electrocardiography (EKG) and EKG Stress Testing — Records your heart’s electrical impulse patterns at normal and stress levels. 24-hour Holter Monitoring — A small, portable device records your heart’s electrical activity during daily activities. 30-day Event Monitoring — A small, portable device records your heart’s electrical activity over a long period and enables you to transmit an event over phone lines.