A 64 yeаr оld wоmаn presents tо the ER with а chief complaint of shortness of breath and lightheadedness. The nurse places the patient on the cardiac monitor and identifies the rhythm as a second degree type 2 AV block (Mobitz 2). The patient is diaphoretic and continues to complain of shortness of breath. The client's heart rate is 46 bpm and the blood pressure is 83/45 mm Hg. The nurse knows which of the following interventions should be completed?