I am not located in Los Angeles, however I am member of a few different Sphynx groups. I know we were chatting before about this topic, so I have been keeping my eyes peeled for you @Dee Simon. So far two people in that area recommended Access Animal Hospital - specifically Dr. Steven Cole for licensed cardiology. However there are a bunch of local HCM clinics seasonally too. I will add more here as they come up! And hopefully others chime in too.
I've heard Access Animal Hospital is great for cardiology treatment but I'm just trying to find a regular vet in the LA area that is familiar with the breed. My Sphynx who passed away earlier this year was misdiagnosed with feline asthma at the The Veterinary Care Center in West Hollywood and I feel he would still be alive today if we hadn't taken him there. I'm sure there is a decent vet somewhere in Los Angeles who's familiar with the breed. Thanks for your help!