A 45-year-old female presents with severe generalized weakness, muscle cramps, and palpitations. ECG shows prominent U waves and flattened T waves. Her serum potassium is 2.1 mEq/L. She is otherwise stable. Which of the following is the most appropriate initial treatment?
✓ Correct Answer: Option B
Severe hypokalemia with ECG changes requires intravenous potassium replacement. Given the cardiac involvement, rapid, but safe, correction is needed, typically at a rate of 10-20 mEq/hour. Oral supplementation is too slow for symptomatic hypokalemia. Calcium is for hyperkalemia, and dialysis is not indicated.