A nurse is preparing to administer digoxin (Lanoxin) to a client with heart failure. On assessing of the client, the nurse notes an apical pulse rate of 58 beats/min and the client complains of anorexia and nausea. Which action should the nurse take first on the basis of these assessment findings?
A) Contacting the physician
B) Administering an as-needed antiemetic
C) Checking the most recent digoxin level
D) Administering the digoxin with an antacid