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 An electrocardiogram (EKG or ECG) is a non-invasive test that records the electrical activity of the heart to help diagnose various heart conditions. It is a quick, painless procedure typically completed within 10 minutes, used to assess heart rhythm, rate, and electrical conduction.​

Purpose and Uses

An EKG is commonly performed to evaluate symptoms such as chest pain, shortness of breath, dizziness, or irregular heartbeats. It helps diagnose conditions including arrhythmias (like atrial fibrillation and bradycardia), previous heart attacks, and ischemia (reduced blood flow to the heart muscle). It can also detect heart enlargement, electrolyte imbalances, and the effectiveness of treatments such as pacemakers or medications.​

How It Works

During an EKG, small electrodes are placed on the chest, arms, and legs to detect the electrical signals generated by the heart with each beat. These signals are recorded and displayed as wavy lines, which a healthcare provider analyzes to assess the timing, strength, and rhythm of heart activity. The test can be performed at rest or during stress (via exercise) to evaluate heart function under different conditions.​

Types and Monitoring

Standard EKGs capture heart activity at rest, while portable devices like Holter monitors or event monitors are used for longer-term tracking, especially when symptoms are intermittent. Some personal devices, such as smartwatches, also offer EKG functionality, though clinical confirmation is recommended for abnormal findings.​