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ECG changes in hypokalaemia
Medicine · exam-style practice question with explanation
Which ECG finding is most typical of hypokalaemia?
- A. Tall peaked T waves
- B. Prominent U waves
- C. Short QT interval
- D. Widespread ST elevation
Show the answer and explanation
Answer: B. Prominent U waves
Hypokalaemia causes flattened T waves, ST depression and prominent U waves, and can lengthen the apparent QT. Tall peaked T waves suggest hyperkalaemia, the opposite problem.
Key point: Low potassium: U waves and flat T waves. High potassium: peaked T waves.
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