I believe at this point I've had every type of non-invasive scan available, not including all the various contrasts and radioactive tracers that are possible. A

I believe at this point I've had every type of non-invasive scan available, not including all the various contrasts and radioactive tracers that are possible. An echocardiogram showed my heart beating weird obviously, but revealed no structural problems. The doctors seemed to use ultrasound mainly to look for perfusion through my heart muscle after pacemaker surgery, and once again provided no clues as to the cause of the nerve damage. It was a mystery until I had a PET scan, which was very telling, and then a subsequent biopsy to confirm the diagnosis. I now have a lot of cool images of my insides on a CD, and I'm Bluetooth enabled.