A nurse is caring for a client who had an onset of chest pain 24 hour ago. The nurse should identify that an increase in which of the following values is diagnostic of a myocardial infarction (MI)? A. Myoglobin B. C-reactive protein C. Creatine kinase-MB D. Homocysteine {Ans: C. Creatine kinase-MB Creatine kinase-MB is the isoenzyme specific to the myocardium. Elevated creatine kinase-MB indicates myocardial muscle injury.}A nurse is an emergency department is caring for a client who has a blood pressure of 254/139 mm Hg. The nurse recognizes that the client is in a hypertensive crisis. Which of the following actions should the nurse take first? A. Initiate seizure precautions B. Tell the client to report vision changes C. Elevate the head of the client's bed D. Start a peripheral IV {Ans: C. Elevate the head of the client's bed The greatest risk to this client is organ injury due to severe hypertension. Therefore, the first action the nurse should take is to elevate the head of the client's bed to reduce blood pressure and promote oxygenation.}A nurse is caring for a patient who has endocarditis. Which of the following findings should the nurse recognize as a