First off, let me just say that I'm not a paramedic (hence the username) so I might have a different perspective from you guys. I am however, hard of hearing in both ears (severe to profound), but I am COMPLETELY oral and with the help of my cochlear implant (will be getting another one soon! ) I can hear very well, almost close to what you can hear. My point is, being hard of hearing doesn't necessarily mean that you're deaf. It doesn't mean you can't hear the person right next to you. The ability to hear with hearing aids/in general varies from person to person, so I would be careful about making generalizations about people who are considered hearing impaired, as many of them might have cochlear implants which help a lot. Anyways, I just wanted to throw that out there, but I completely understand how you guys might feel about having a hard of hearing partner.
Also, about the hearing breathing sounds, etc, there are stethoscopes for people with hearing losses that work REALLY well from what I've heard. You simply piug them into your hearing aid/cochlear implant and viola
http://www.medicalsupplydepot.com/Diagnostic-Products/Stethoscopes/Littmann-3200-Bluetooth-Electronic-Stethoscope.html?utm_source=googlemerchant&utm_medium=cse&utm_campaign=datafeed&utm_content=10673&zmam=43382607&zmas=1&zmac=28&zmap=10673&gclid=CMzkvPW707cCFRCe4Aod3ksAFg
But now I'm wondering...should I be discouraged about becoming an EMT?