A nurse is administering a continuous intravenous infusion o…

A nurse is аdministering а cоntinuоus intrаvenоus infusion of nitroglycerin to a patient with acute coronary syndrome. The provider has ordered the nitroglycerin to be titrated based on the patient’s blood pressure and chest pain level. The current infusion rate is 10 mcg/min, and the order states to increase the rate by 5 mcg/min every 5 minutes until the chest pain is relieved or the systolic blood pressure drops below 90 mm Hg. Which of the following actions should the nurse take first?