Micah True Died From Heart Disease

resources2.news.com.au

Micah True, known as Caballo Blanco, died in March while running in the wilderness of New Mexico (read related post on the tarahumara ambassador. He was found to have idiopathic cardiomyopathy, or heart disease with an unknown cause, said the Office of the Medical Investigator (source running.competitor.com).

I don't know about you but this is not telling me anything so googled the term a little bith and found more information on idiopathic cardiomyopathy. What I found is that cardiomyopathy can have various causes and if the cause is unknown it is called 'idiopathic cardiomyopathy'.

OK so what about this cardiomyopathy. Cardiomyopathy is a chronic disease of the heart muscle (myocardium), in which the muscle is abnormally enlarged, thickened, and/or stiffened. The weakened heart muscle loses the ability to pump blood effectively, resulting in irregular heartbeats (arrhythmias) and possibly even heart failure.
This 'enlarged' triggered me to read on if there was any relation with his running but not that I could find. I think it would have been mentioned by the medical investigator. Read more in this medial dictionary.