I don't know about specifics in his case. But there are situations where an anomalous single coronary, ( usually there are 3 arteries with 2 ostium origins) has it's ostium originating in the aorta in the right sinus of valsalva. This in some cases means the artery's path runs between the pulmonary artery, and the aorta ( both are the major outflow tracks).I remember hearing some interesting stuff about Pistol Pete - the autopsy revealed that he'd been born with only one carotid artery. I believe normal is two. Anyway, that one artery had to do the work of two, supplying the entire heart with oxygenated blood. It's amazing he lived to 40.
As they say, choose your parents wisely.
What this means is that during or post exercise, the artery can become occluded, squeezed If you will, between the PA and Ao which are enlarged/plumped up temporarily from exercise.
The temporary occlusion of the only myocardial muscle blood supply( the single artery instead of 3) causes a dysrythmia like ventricular tachycardia or fibrillation, I.E. you drop dead, sudden cardiac arrest.
It's rare, but occurs.
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