U wave

U wave
U wave 'yü-. n a positive wave following the T wave on an electrocardiogram

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in the electrocardiogram, a small positive deflection usually immediately following the T wave but often poorly separated from it and so concealed; it is postulated to represent repolarization of the Purkinje fibers or a mechanical event such as ventricular relaxation. It is not invariably present and is most often seen in tachyarrhythmias and electrolyte disturbances. See also illustration at electrocardiogram.

Medical dictionary. 2011.

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