EP216: Cholesterol and the Arteries

Welcome to my podcast. I am Doctor Warrick Bishop, and I want to help you to live as well as possible for as long as possible. I’m a practising cardiologist, best-selling author, keynote speaker, and the creator of The Healthy Heart Network. I have over 20 years as a specialist cardiologist and a private practice of over 10,000 patients. Podcast Summary Dr. Eric Bishop, a practicing cardiologist and author, hosts this educational episode exploring how cholesterol accumulates in arteries. He discusses the research of Vladimir Subotin, a member of the Russian Academy of Sciences, who challenges the conventional understanding of cholesterol deposition in coronary artery disease. The episode examines the mechanisms behind plaque formation and presents an alternative theory about cholesterol transport in artery walls. Key Takeaways: The LDL hypothesis—that "bad" cholesterol in the bloodstream causes coronary artery disease—is well-supported by decades of research showing that lowering LDL cholesterol reduces heart attack risk in high-risk individuals. The conventional understanding assumes cholesterol particles float in the bloodstream and cross the inner artery lining (tunica intima) to deposit cholesterol in the artery wall. Microscopic examination of plaque development shows cholesterol buildup begins in the middle layer of the artery (tunica media), not the inner lining, which contradicts the standard inside-to-outside migration theory. Subotin proposes that wear and tear in arteries triggers inflammation and signals local cells to release tissue factors, initiating the cholesterol accumulation process. An alternative mechanism suggests cholesterol enters the middle artery layer through vasa vasorum—tiny blood vessels that supply nutrients to the artery wall itself—rather than migrating from the bloodstream. The mechanism of how cholesterol enters the artery wall remains mechanistically complex and difficult to observe directly in living organisms. Coronary artery disease is multifactorial, involving not just cholesterol but also inflammation, wear and tear, and blood pressure as important contributing factors. Regardless of the precise mechanism of cholesterol deposition, clinical evidence confirms that lowering cholesterol in high-risk patients reduces their future cardiovascular risk.