The Nurse Is Preparing a Client for Abdominal Surgery Who

The nurse is preparing a client for abdominal surgery who takes a diuretic and a ?-blocker pill to control blood pressure. Which of the following client information is most important for the nurse to communicate to the health care provider before surgery?

A) Pulse rate 59 beats/minute
B) Hematocrit 35%
C) Blood pressure 142/78 mm Hg
D) Serum potassium 3.3 mmol/L