The patient receiving bosentan therapy for pulmonary arterial hypertension presents to the emergency department (ED) complaining of dyspnea. Which nursing assessment is most important for this patient?

The 32-year-old patient presents complaining of severe itching on the arms that has gotten worse as her job has gotten more stressful. Upon assessment, the nurse observes erythematous lichen patches on the arms and in the antecubital fossa, where it is fissured and weeping. The nurse anticipates providing education about which medication?  

The nurse is caring for a patient with a suspected methicillin resistant staphylococcal aureus (MRSA) skin infection. While awaiting wound cultures and sensitivities, the patient is empirically given vancomycin. When the nurse starts the IV infusion of vancomycin, the patient acutely develops a pruritic, erythematous rash that involves the face, neck and upper torso. Which action does the nurse take first?