A patient had a 1-liter bag of 5% dextrose in 0.9% sodium ch…

A patient had a 1-liter bag of 5% dextrose in 0.9% sodium chloride started at 3 pm. The nurse making rounds at 3:45 pm finds that bag has 400 mL remaining.  The patient is complaining of dyspnea, a pounding headache, chills, and has an elevated pulse rate.  What action should the nurse take first?