Serum calcium, potassium, and magnesium levels should be monitored. The QT interval should be followed for signs of hypocalcemia. Hypocalcemia results in prolonged QT intervals.

• 监测血清的钙、钾和镁的水平。注意QT间隔，看是否有血钙过少的迹象。血钙过少会导致延长的QT间隔。