Which of the following describes the professional role of the nurse in a healthcare setting?

You are a new nurse taking care of a patient with congestive heart failure. You see an order to administer 500 mL of 0.9% normal saline over 6 hours. Later on in your shift, you realize that you mistakenly administered 2000 mL of 0.9% normal saline over 2 hours, and now the patient is slightly short of breath. Which of the following is the most appropriate next step?