An electrocardiogram, also known as an EKG, is a test that measures the electrical signals that control the rhythm of your heartbeat. During the test, electrodes (small, plastic patches) are placed on a patient’s chest, arms and legs. These electrodes are also connected to the EKG machine that measures and interprets the electrical activity of the heart, providing your doctor with important information about the size of the chambers of the heart and the pumping function of the heart.
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