Can a person with a hearing impairment use a stethoscope?

Yes, there are digital electronic stethoscopes that can be used by people with hearing impairments.

For example, the ViScope™, amplifies sounds 30 times louder than an acoustic scope and provides a visual display of the phonocardiogram or phonopneumogram. The ViScope™ is intended for use with In-the-Ear (ITE) and "open fit" Behind-the-Ear (BTE) type hearing aids. Some models are supplied without headphones allowing the user to choose the appropriate listening device to meet their specific needs.