The electrocardiogram (ECG) is a diagnostic tool that measures and records the electrical activity of the heart in delicate detail. Interpretation of these details allows diagnosis of a wide range of heart conditions. These conditions can vary from minor to life threatening. The process of performing an ECG involves attaching a series of electrodes to the patient’s chest and limbs, and printing a recording on the ECG machine for interpretation by the specialist. It takes approximately 5 minutes to record a diagnostic ECG.