The Nurse Administers Sublingual Nitroglycerine,a Vasodilator,to a Patient Diagnosed with Angina.When

The nurse administers sublingual nitroglycerine,a vasodilator,to a patient diagnosed with angina.When the patient's chest pain is not relieved,the nurse prepares to give another nitroglycerine tablet.What is the nurse's priority action prior to administering the next dose of medication?

A) Notify the physician.
B) Elevate the head of the bed.
C) Measure the patient's blood pressure.
D) Place the patient on a cardiorespiratory monitor.