A female client has been hospitalized for several months following major abdominal surgery for a ruptured colon. A colostomy was created, and the large abdominal wound was left open and allowed to heal through granulation. She is receiving gentamicin IV for treatment of wound infection. Knowing this drug is ototoxic, the nurse would implement which of the following measures?

D Instruct the client in Valsalva's maneuver to equalize middle ear pressure and to prevent hearing loss. B Advise the client to discontinue the drug at the first sign of dizziness. A Instruct the client to report any signs of tinnitus, dizziness or difficulty hearing. C Order audiometric testing in order to determine if hearing loss is caused by an ototoxic drug or other cause.