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MCQ 6: U wave

Q. Prominent U wave in ECG are seen in?
A. Hyperthermia
B. Hyperkalemia
C. Hypokalemia
D. Hypercalcemia


Answer: Option C

Explanation:
Prominent U waves are most commonly seen in hypokalemia and hypothermia.
The mechanism of appearance of these waves is not known. The two theories state that U waves occur due to:
1) Delayed repolarization of Purkinje fibres
2) Prolonged repolarization of mid myocardial M cells.
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