Mr. Santos, a 55-year-old Male, Presents to the Emergency Department with Complaints of Chest Pain and Shortness of Breath. He Has a History of Hypertension and Hyperlipidemia. on Physical Examination, His Blood Pressure Is 160/90 Mmhg, Heart Rate Is 100 Bpm and Respiratory Rate Is 20 Breaths Per Minute. an ECG Is Ordered to Evaluate His Cardiovascular Status