An electrocardiogram (ECG or EKG) is a simple, painless, and quick test that records the electrical activity of the heart. It is a common and non-invasive test used to diagnose and monitor many types of heart conditions and their treatment. During the test, electrodes are placed on the chest, arms, and legs to detect the electrical signals produced by the heart each time it beats. These signals are recorded by a machine and are looked at by a doctor to see if theyre unusual. An EKG can help diagnose a heart attack, check heart rhythm, and see if there is poor blood flow to the heart muscle. It can also be used to detect arrhythmias, cardiomyopathy, and other heart problems. EKG machines are standard equipment in operating rooms and ambulances, and some personal devices, such as smartwatches, offer EKG monitoring. The test is quick, safe, and painless, and it is often included as part of a patient’s regular checkup. The test can be carried out by a specially trained healthcare professional at a hospital, a clinic, or at a GP surgery.