The U wave is a deflection (normally positive) that occurs immediately after the T wave and prior to the P wave.
Frequency: up to 50% of normal individuals
Source: uncertain
Parameters:
(1) amplitude in mm
(2) deflection
(3) duration in milliseconds
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U Wave Amplitude
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Interpretation
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<= 2 mm
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physiological
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> 2 mm
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pathological
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The amplitude of the U wave is typically <= 11% of the preceding T wave.
The normal U wave is typically positive (may be negative in VR).
The duration of the U wave in a normal adult is 170 ms +/- 30.
