Final answer:
The nurse should notify the provider about tinnitus in a client taking aspirin daily, as it could be a sign of aspirin toxicity.
Step-by-step explanation:
The nurse should notify the provider immediately if a client who has been taking aspirin daily for the past year exhibits signs of tinnitus. Tinnitus, which often manifests as ringing in the ears, could indicate aspirin toxicity or overdose. Aspirin is used on a daily basis as a preventive measure for various cardiac events, but it can cause serious side effects such as ulcers and bleeding. The other symptoms mentioned, including bradycardia (slow heart rate), headache, and nausea, could potentially be related to different conditions or less critical side effects of aspirin, but tinnitus requires immediate clinical attention due to the risk of more serious complications.