A patient with hypokalemia and heart failure is admitted to the telemetry unit. The nurse is aware that hypokalemia could cause which of the following abnormalities on an electrocardiogram (ECG)?
A) Shortened P-R interval
B) Inverted T wave
C) Depressed U wave
D) Elevated U wave
Ans: D
Feedback: An elevated U wave is specific to hypokalemia.
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