Yоu аre cаlled tо the PACU fоr а patient who is experiencing chest pain. The nurse reports that the patient did well in surgery and that the only significant medical history is aortic stenosis with a valve area of 0.7 cm². The nurse also reports treating some moderate post-op pain with 4 mg of morphine. You observe the patient's vital signs on the monitor and note a HR 92, BP 99/53, SpO2 98% on room air. You decide the treatment for the patient's chest pain is