As a medical professional with expertise in cardiology, I can explain the significance of 'U' waves on an electrocardiogram (ECG). The 'U' wave is a deflection that occurs after the 'T' wave, and it is not always visible due to its small amplitude. When present, 'U' waves are
thought to indicate the repolarization of the Purkinje fibers, which are part of the electrical conduction system of the heart. These fibers help to synchronize the contraction of the heart muscle. The presence of 'U' waves can sometimes be associated with certain conditions, such as hypokalemia (low potassium levels in the blood), which can affect the electrical activity of the heart.
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