A 60 year old male client comes into the emergency department with complaints of crushing substernal chest pain that radiates to his shoulder and left arm. The admitting diagnosis is acute myocardial infarction (MI). Immediate admission orders include oxygen by nasal cannula at 4L/minute, blood work, a chest radiograph, a 12-lead electrocardiogram (ECG) and 2 mg of morphine sulfate given intravenously. The nurse should first: