An electrocardiograph, commonly known as ECG or EKG, is an electronic device that records the electrical activity of the heart over a period of time. This non-invasive method involves placing electrodes at 12 points on the patient's chest and measuring and measuring the direction and magnitude of the heart's electrical depolarization. A healthy heart has a known sequence of electrical events that happen with each heartbeat. A skilled EKG operator is capable of seeing variations in this sequence that can indicate a cardiac problem.

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