Check out this blog post by Dr. Steve Ommen, head of Mayo's HCM Center

In it he talks about why having an HCM expert is so important and how they work together with a local cardiologist as part of a team with the patient. Well worth the read.
https://hcmbeat.com/2016/11/20/guest-blogger-the-view-from-a-hcm-center-by-dr-steve-ommen-of-mayo-clinics-hcm-clinic/