Relias Dysrhythmia Basic A 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

What does the presence of a U wave on an ECG suggest?

A Myocardial ischemia

B Electrolyte imbalances, particularly hypokalemia

The presence of a U wave on an electrocardiogram (ECG) is commonly associated with electrolyte imbalances, particularly hypokalemia. U waves can appear following the T wave and are thought to represent repolarization of the Purkinje fibers or the endocardial regions of the heart. When potassium levels in the blood are low, as seen in hypokalemia, the heart's electrical activity can be affected, leading to the appearance of U waves.

While U waves may sometimes be observed in healthy individuals, their notable presence or prominence is often a clinical sign that warrants further investigation into potential underlying issues such as electrolyte imbalances. This association highlights the importance of monitoring electrolyte levels in patients, especially those exhibiting dysrhythmias or other cardiac concerns.

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C Normal heart function

D Atrial enlargement

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