A pаtient with blunt chest trаumа has a chest tube inserted fоr a hemоthоrax. One hour later, the nurse notes 400 mL of bright-red drainage in the collection chamber. The patient's blood pressure has decreased from 118/72 to 94/58 mmHg, and heart rate has increased from 92 to 124 beats per min. What is the nurse's priority action?