How does an ECG machine work?
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An electrocardiogram (ECG) is a non-invasive test that measures the electrical activity of the heart. The test involves attaching up to 12 sticky electrodes to the chest, arms, or legs, and connecting them to an ECG machine with wires. The machine then converts the signals it receives into a graph that shows the electrical impulses traveling through the heart with each heartbeat. During an ECG, the patient lies flat and relaxes while the computer creates the graph. The test takes about 10 minutes to complete, but the actual recording only takes a few seconds. The patient can breathe during the test, but should remain still and avoid talking.