Lead I is one of the standard limb leads used in electrocardiography (ECG) to measure the electrical activity of the heart. It records the potential difference between the right arm (RA) and left arm (LA) electrodes, providing a view of the heart's electrical axis in the frontal plane. Lead I is essential for diagnosing various cardiac conditions, as it helps visualize arrhythmias and other abnormalities in heart function.
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