ECG stands for Electrocardiogram. It's a common diagnostic test that records the electrical activity of the heart over a period of time. During an ECG, small electrode patches are attached to the skin of the chest, arms, and legs. These electrodes detect the electrical signals generated by the heart as it beats and transmit them to a machine that records the signals as a series of waves displayed on graph paper or a monitor.

An ECG provides valuable information about the heart's rhythm, rate, and electrical conduction system. It can help diagnose various heart conditions, including arrhythmias, heart attacks, heart valve problems, and abnormalities in the heart's structure. ECGs are often performed as part of routine check-ups, during the evaluation of symptoms such as chest pain or palpitations, and before surgical procedures or starting certain medications.

Interpreting an ECG requires expertise, and results are typically analyzed by healthcare professionals such as cardiologists or trained technicians. Abnormalities in the ECG pattern may indicate underlying heart problems, prompting further evaluation and treatment as needed. Overall, ECGs are valuable tools in assessing heart health and guiding medical decision-making.