Cardiac Vascular Nursing Certification Practice Exam 2026 – Your All-in-One Guide to Exam Success!

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What does the U wave represent in an electrocardiogram?

Repolarization of the atria

Repolarization of the purkinje fibers

The U wave in an electrocardiogram is often associated with the repolarization of the Purkinje fibers. While the exact origin of the U wave is still not fully understood, it is generally accepted that it reflects the final phase of ventricular repolarization, which involves the Purkinje system. This is crucial because it highlights the electrical activity that occurs in the heart after the main ventricular repolarization, represented by the T wave.

Understanding the role of the U wave aids in recognizing potential cardiac abnormalities; when U waves are prominent or abnormal, it may suggest issues such as electrolyte imbalances or other cardiac conditions. Thus, recognizing that the U wave is linked to Purkinje fiber activity provides important clinical insights into ventricular repolarization and the overall cardiac cycle.

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Depolarization of the ventricles

Atrial contraction

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