Ekg, an acronym for electrocardiogram, is a medical test that records the electrical activity of the heart. There are several synonyms for this term, including ECG, electrocardiography, and cardiogram. These terms are all used interchangeably to describe the same test that is used to diagnose heart conditions such as arrhythmias, heart attacks, and heart failure. The EKG machine produces a graphical representation of the heart's electrical activity, which is interpreted by a doctor or cardiologist to determine the health of the heart. Synonyms for EKG are important for medical professionals to know and use in order to communicate effectively and efficiently with one another about patient care.