It could be, genetic. I think maybe, once people hit a certain age, or younger due to family history certain tests might want to be done to rule out any potential problems. Worry, stress, and anger should be called diseases, they are very destructive forces. Sometimes, like what happened to my dad years ago, the meds they put him on for high blood pressure caused him to become depressed and angry; once, the doctor changed the meds, he was fine. The first meds was really counterproductive to him.
I'll look into that book. Is this it?
http://mqup.mcgill.ca/book.php?bookid=1753
http://www.heart.org.in/diseases/echocardiography.html
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