@wa34937 @cindajune Mayo Clinic has a care network where other hospitals work in conjunction with Mayo specialists to care for patients nationwide in the US. Here is a map with locations of hosipitals in the Mayo Clinic Care Network. Perhaps you can find a cardiologist at one of these locations who would have the benefit of consulting directly with Mayo specialists. There are also a lot of Mayo trained specialists at hospitals across the nation.
https://www.mayoclinic.org/about-mayo-clinic/care-network/network-members
With cardiology, it really is best to have a cardiologist near where you live because if you have a cardiac event, you would want your cardiologist who knows your history to be able to see you. If you do live local to one of the Mayo campuses, you could try again.

My dad was a cardiac patient and I was with him through a lot of it and I was working with my dad's doctors as his caregiver and advocate. I even sent my dad to the emergency room several times when my parents didn't recognize the cardiac event that had occurred. One of those was an electrical problem in the heart where my dad collapsed on the floor, but then recovered and was OK again. His pacemaker defibrillator had fired and saved his life after an arthymia. Those devices are closely monitored by a receiver that sends information to the doctor around the clock. This illustrates why a local specialist is needed for the cardiac monitoring.