The triage nurse assesses an anxious and diaphoretic 54-year old man who arrives at the ED complaining of severe, left-sided pressure like chest pain, and left arm numbness. The pain began 2 hours ago and is unrelieved by rest. He has no significant medical history. After initiating cardiac monitoring, the nurse administers oxygen at 2 liters/minute and establishes an IV line of dextrose 5% in water (D5W) at a KVO rate. The patient’s vital signs are blood pressure 120/60 mmHg, pulse rate 88 beats/minute and irregular, and respirations 20 breaths/minute. The cardiac rhythm shows normal sinus rhythm with occasional unifocal premature ventricular contractions (PVCs). The triage nurse suspects that this patient is exhibiting signs of a myocardial infarction (MI) because the chest pain: