NR 324 Midterm Exam Study – ATI Test 4 Practice Assessment A nurse is planning care for a client who has a suspected myocardial infarction. Which of the following should the nurse administer first? While reading a client’s ECG tracing, the nurse should understand that the P wave reflects which of the following cardiac electrical activities? A client comes to the emergency department via ambulance to report severe radiating chest pain and SOB. The client appears restless, frightened, and sli...