U Wave

Aka: U Wave, EKG U Wave

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II. Definitions

  1. U Wave
    1. EKG variably present wave occurring between the T and P Waves
    2. May represent delayed repolarization of the bundle branches or Purkinje Fibers

III. Findings: Normal

  1. U Wave best seen in lead V3
    1. In Hypokalemia, may also appear as a biphasic T Wave in V1-3
    2. Mattu (2017) Crit Dec Emerg Med 31(3): 11
  2. U Wave with same polarity as T Wave

IV. Causes: Prominent U Wave

  1. Hypokalemia

V. Causes: Inverted U Wave

  1. Myocardial Ischemia
  2. Myocardial strain pattern

VI. Causes: Increased U Wave amplitude

  1. Digoxin (Digitalis)
  2. Quinidine
  3. Hypercalcemia
  4. Epinephrine
  5. Thyrotoxicosis

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