Anurse in the emergency department is caring for a client who has pulmonary edema, reports dyspnea, and appears anxious. the client's blood pressure is 108/79 and his apical pulse is 112. which of the following interventions is the nurse's priority?
a. administer high-flow oxygen at 5 l/min by facemask to the client
b. place the client in high-fowler's position with legs dependent
c. give the client sublingual nitroglycerin
d. reassure the client

A62-year-old man is being treated for an acute myocardial infarction. he originally came to the ed with substernal chest pain and diaphoresis. given his risk factors of hypertension, diabetes, tobacco use, and family history, he is considered high risk. an ecg in the ed reveals a left-bundle branch pattern, and cardiac enzymes are elevated slightly. after a focused evaluation in the ed, the patient receives iv thrombolytics. although his bundle branch pattern never resolves, the patient is chest pain-free and haemodynamically stable after thrombolysis. two days later, however, the patient reports episodes of recurrent chest discomfort and shortness of breath overnight. in evaluating for potential myocardial reinfarction, which of the following is the most appropriate diagnostic test? - creatinine kinase- dynamic ecg changes- lactate dehydrogenase- myoglobin levels- troponin i level