The Nurse Is Caring for a Patient Who Has a Pulse

The nurse is caring for a patient who has a pulse rate of 44.His blood pressure is within normal limits.In trying to determine the cause of the patient's low heart rate,what would the nurse suspect?

A) That the patient has a fever.
B) Possible hemorrhage or bleeding.
C) That the patient is taking calcium channel blockers or digitalis medications.
D) Chronic obstructive pulmonary disease (COPD) .