Making Heart Attacks History (TED Talk from 2011) by Dr Esselstyn is the best video I've come across that explains how heart attacks are caused. The explanation starts at offset 7:20.
Source: Making Heart Attacks History (TED Talk from 2011) by Dr Esselstyn. Watch for 3:30 mins at offset 7:19.
An excellent TED Talk. I encourage all of my friends to watch it. At offset 7:19, Dr Esselstyn (former heart surgeon from Cleveland Clinic) explains how 90% of heart attacks are caused. This is the the best explanation that I have come across.
How are heart attacks caused (watch for 98 seconds from offset 1:22 to 3:00). Dr McDougall paints a nasty visual picture of "festering sores" inside our arteries that repeatedly pop open to cause us heart attacks:
Dr McDougall explains how heart attacks are caused from offset 1:22 to offset 3:00.
The videos below have further details pertaining to heart attacks:
Transcript. Dr Greger's summary: "Atherosclerotic plaques in coronary arteries may be more aptly described as pimples, initiated by the infiltration of cholesterol into the lining of our arteries. The ending — should blood flow to our heart muscle be cut off by a clot formed by the rupture of one of these inflamed pockets of pus in our arterial lining — is a heart attack.
Transcript. Dr Greger's summary: "Crystallization of cholesterol may be what causes atherosclerotic plaque rupture, the trigger for heart attacks."
An interesting video that explains that cholesterol crystallization may be the mechanism that ruptures the endothelial layer, leading to thrombosis and heart attacks. First few minutes are based on this paper: Atherosclerosis: The New View by Peter Libby, Scientific American, 2008.
Heart attacks are often fatal and often occur in those who have no prior history of heart disease.
Source: Prevent and Reverse Heart Disease (20 mins, 2019) by Dr Steven Lome
A related statistic is from this video by Dr Greger: