Monitoring for Adverse Effects of Vancomycin

A nurse is working on a medical-surgical unit and is responsible for administering parenteral medications to her patients. One of her patients, a 70-year-old woman, has been prescribed vancomycin due to a Methicillin-resistant Staphylococcus aureus (MRSA) infection. The physician has ordered vancomycin 1 g, to be administered intravenously over a period of 90 minutes. Before administering the medication, the nurse remembers the importance of monitoring for adverse effects. Given this context, the nurse should especially monitor for which of the following potential complications during and after the administration of vancomycin?