A patient on high-dose furosemide therapy develops flattened T waves, ST segment depression, and prominent U waves on electrocardiogram. Which electrolyte disturbance is present?
Answer and explanation
Correct answer: B. Symptomatic hypokalemia
Answer: Symptomatic hypokalemia.
Why not the others: Hypercalcemia causes shortening of the QT interval; Hypermagnesemia leads to PR prolongation, widened QRS, and heart blocks; Hypernatremia does not directly produce prominent U waves or ST depression.
Why not the others: Hypercalcemia causes shortening of the QT interval; Hypermagnesemia leads to PR prolongation, widened QRS, and heart blocks; Hypernatremia does not directly produce prominent U waves or ST depression.
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