There are a couple of options here. 1) if the hearing aid user wears a
smaller model hearing aid (canal, CIC), then there is an adapter you can
purchase to use in conjunction with the stethescope. The only one I know of
is the "stethomate" put out by Starkey. Basically, it's a pair of rubber
"cups" that fit over the hearing aid and attach to the stethescope. 2) don't
rule out the possibility of an amplified stethescope if this person is having
difficulties yet does not wear hearing aids. Again, Starkey makes such a
stethescope and may offer him some benefit.
I hope this helps
Jodi Gendreau, MA, CCC-A