U wave
U wave
The U wave is a wave on an electrocardiogram (ECG) following the T wave. It is usually in the same direction as the T wave and is generally considered to be a normal part of the ECG.
Pronunciation
U wave: /ˈjuː weɪv/
Etymology
The term "U wave" is derived from the Latin word "unda", which means "wave". It is named so because it follows the T wave in the ECG and is the fifth and last wave in the cardiac cycle.
Related Terms
- Electrocardiogram: A test that measures the electrical activity of the heartbeat.
- T wave: The part of the ECG that represents the repolarization of the ventricles.
- Cardiac cycle: The sequence of events that occur when the heart beats.
- Repolarization: The process by which the cardiac muscle cell is restored to its resting state after depolarization.
Function
The U wave is thought to represent repolarization of the Purkinje fibers. However, its exact source is not well understood. It is usually present in normal individuals and is most often seen in leads V2 and V3. The U wave is usually smaller than the T wave and, by convention, is described as having a positive deflection.
Clinical Significance
Prominent U waves are seen in conditions such as hypokalemia, bradycardia, and exposure to digitalis. They can also be seen in patients with hypertension and coronary artery disease. Inverted U waves are a rare finding and can be a sign of myocardial ischemia or left ventricular volume overload.
External links
- Medical encyclopedia article on U wave
- Wikipedia's article - U wave
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