Keywords: HoH, stethoscope, trick of the trade (PubMed Search)
Is your older patient hard of hearing (HoH)? Instead of shouting, get a stethoscope. Put the ear buds in your patient's ears and talk into the bell. It is a hearing amplifier you carry with you.
Bonus pearl: If you use the disposable stethoscopes, then the patient can keep it in their room and use it whenever anyone wants to talk to them.