An ECG (electrocardiogram) is a specialized area focused on performing and interpreting ECG tests, which measure the heart's electrical activity. These tests help diagnose various heart conditions, including arrhythmias, ischemia, and prior heart attacks. ECG results are used to diagnose a wide range of cardiac conditions, guiding further treatment or management. ECG results help doctors determine the best course of treatment for various heart conditions. ECGs are used to monitor the effectiveness of treatments and the progression of heart conditions.