The 50-year-old previously healthy patient complains of shortness of breath, especially on exertion or when laying down to sleep. She takes over-the-counter allergy medicine for seasonal allergies and melatonin to help her sleep sometimes. Her vital signs are heart rate of 64 bpm, respirations 22, oxygen saturation 99%, and blood pressure 114/68 mmHg. Her assessment is notable for crackles over the bilateral lung bases and a moderate diastolic apical murmur. The nurse prepares the patient for which initial tests? Select all that apply. 

The nurse is performing an electrocardiogram on a patient with rhabdomyolysis. The patient asks the nurse what the rationale is for this test, since he is young and has no cardiac history. Which of the following responses by the nurse is most appropriate?

The nurse notices that the patient’s peripheral IV insertion site is red and indurated. What action does the nurse perform first?