Electrical alternans is a medical term that describes the alternating patterns of heartbeats seen on an electrocardiogram (ECG). The term is often used to describe the presence of an underlying heart condition, and it can be life-threatening if left untreated. Synonyms for electrical alternans include alternation of the cardiac cycle, alternating cardiac complexes, and alternating heartbeats. Other related terms include electrical axis deviation, T wave alternans, and ventricular tachycardia. Recognizing the symptoms of electrical alternans is crucial for timely diagnosis and treatment, as it can indicate a serious heart condition such as cardiomyopathy or heart failure. Treatment may include medication, lifestyle changes, and in some cases, surgery.