Have your friend Google "Cleveland Clinic." They have a web site for their cardiovascular department full of information he might find useful.
I was mis-diagnosed with hypertrophic cardiomyopathy (HCM) mentioned on another thread here. I was referred to the Cleveland Clinic by a retired UAL captain. I was seen by a specialist in HCM and was "un-diagnosed."
Going through the special issuance process now and should be hearing something this week.