Final answer:
The best nursing intervention to improve communication with a hearing-impaired client is using written notes or text-based communication.
Step-by-step explanation:
The best nursing intervention to improve communication with a hearing-impaired client is to use written notes or text-based communication. This allows the client to visually read and understand the information. Speaking in a louder voice may not be effective as it could distort sounds and may not be helpful for those who lip-read. Direct eye contact is important as it helps the client to follow visual cues and cues from facial expressions. Using complex medical terminology may actually hinder communication, as it can be difficult for a hearing-impaired client to understand.