Can You Prevent a Heart Attack Before it Happens? | Dr. John Osborne, MD

If you're new here, do me a favor and hit subscribe, and if you've got a minute, leave a review. It helps more people find conversations like this one, where we dig into the stuff that actually changes how you think about your own health. Here's something that should stop you: put a hundred people with no symptoms into a modern cardiac CT with AI plaque analysis, and only about one percent come out completely clean. Roughly a third of first-timers are already sitting in the most severe stage of plaque buildup, the stage where the ten-year odds of a heart attack or stroke run about forty percent if nothing changes. Most of those people have normal cholesterol panels, normal stress tests, and no idea anything is wrong. In this episode Ravi sits down with Dr. John Osborne, a preventative cardiologist who has spent thirty years working to catch heart disease before it ever causes a symptom. He's Harvard trained, holds a PhD in cardiovascular physiology, and has been doing cardiac CT for about twenty five years, putting him among the earliest adopters of the technology. He now runs Clear Cardio, a telecardiology practice built around cardiac CT and AI plaque analysis, licensed in more than 35 states. The tool most people know is the calcium score, and Osborne is clear that it's not a bad test, just an incomplete one. It only sees calcified plaque, the hard, inert "extinct volcano" left behind after an event, and depending on the population, ten to fifty percent of people with a zero score are still carrying significant lipid-rich plaque the scan simply can't see. That soft plaque is the "lava," the kind that grows quietly for years and then ruptures. Cardiac CT paired with AI changes that picture. It reveals plaque that was previously invisible, measures it in cubic millimeters, and lets doctors track the same plaque over time to see whether it's growing or shrinking. Osborne walks through the staging system, plaque volume graded one to three, with stage three starting at 750 cubic millimeters and carrying that forty percent ten-year event rate. What surprised Ravi most is how little any of this tracks with cholesterol numbers. Across hundreds of thousands of AI exams, Osborne says there's no correlation between plaque burden and LDL, ApoB, or Lp(a), illustrated by two patients with an identical LDL of 108, one with zero plaque and the other with a volume of 1640. The good news is that plaque isn't a one-way street. With a personalized plan covering lipids, blood pressure, and tobacco use, Osborne sees ten to twenty percent reversal within a couple of years, sometimes as much as fifty. **Episode Resources** - Clear Cardio website - Clear Cardio YouTube Channel - Dr. Ravi Kumar's Website - The Dr. Kumar Discovery on YouTube - The Dr. Kumar Discovery on Apple Podcasts - The Dr. Kumar Discovery on Spotify - The Dr. Kumar Discovery on Instagram - The Dr. Kumar Discovery on X - The Dr. Kumar Discovery on TikTok - The Dr. Kumar Discovery on Facebook - Dr. Ravi Kumar on LinkedIn **In this episode, you will discover** - Depending on the population studied, anywhere from ten to fifty percent of people with a zero calcium score still have significant lipid-rich plaque that the scan cannot see. - Calcified plaque is the inert "extinct volcano" left after an eruption, while the dangerous plaque is the lipid-rich soft "lava" that grows, ruptures, and causes heart attacks and strokes. - Quantitative AI on cardiac CT reveals plaque that was previously invisible, measures it in cubic millimeters, and tracks the same plaque over time to show growth or regression. - With a customized plan, ten to twenty percent plaque reversal in a couple of years is common, and Osborne has seen up to fifty percent, against a background progression rate of about ten percent a year if nothing is done. - Lipids are a risk factor, but plaque itself is the disease, so the first question is always whether disease is actually present in your vessels. - Across hundreds of thousands of AI exams, there is no correlation between plaque burden and LDL, non-HDL, ApoB, or Lp(a), illustrated by two patients with an identical LDL of 108 and totally different plaque volumes. - On high-end equipment, the cardiac CT radiation dose is about twenty percent of a mammogram, for a disease that kills roughly ten times more women than the cancer mammograms screen for. - Quitting tobacco of any kind cuts cardiovascular event risk by about fifty percent within a year, before any cholesterol treatment, diet, exercise, or weight loss. - Total plaque volume is graded stage one to three, and stage three, which starts at 750 cubic millimeters, carries a forty percent ten-year risk of a stroke or heart attack if untreated. - Osborne argues that starting with a low-dose combination of two or more cholesterol drugs lowers cholesterol better and with fewer side effects than pushing a single statin higher and higher. - The first oral PCSK9 inhibitor was approved the day before this recording, delivering the same LDL and Lp(a) lowering as the injectable versions with side effects Osborne calls close to placebo. - Stress tests are essentially useless for catching early disease, and about a third of Osborne's stage three patients feel completely fine with a normal stress test. - Nicotine receptors on the vessel lining, in any form of tobacco including vapes and pouches, turn the artery wall from Teflon into Velcro. - There is a third, rarer plaque type called low density noncalcified plaque, and when it shows up it is a major risk factor for rupture. **Episode Highlights** - \[00:00:00] Intro: looking inside your arteries before symptoms - \[00:02:32] What preventative cardiology actually is - \[00:06:40] Inside the scanner: the one-second scan - \[00:08:30] Hard plaque, soft plaque and the lava - \[00:13:22] Do you still do calcium scans? - \[00:17:31] The woman with a zero score who had a heart attack - \[00:19:34] Risk versus benefit against the mammogram - \[00:21:34] Plaque volume, the three stages and event rates - \[00:25:01] The couple of forty two years with identical LDLs - \[00:27:55] ApoB of 180 at 48 with zero plaque - \[00:31:09] Implementation lag and the Wayne Gretzky approach - \[00:34:35] Lipids at the scene of the crime, plus risk enhancers - \[00:38:20] Statins, side effects and the wider toolbox - \[00:42:18] Hitting the target with the right combination first - \[00:44:17] Practising off randomised trial evidence - \[00:46:55] The goal of eliminating heart disease - \[00:51:34] The same drug that cuts PVCs by sixty percent - \[00:55:07] Mediterranean, DASH and eggs as health food - \[00:58:44] Where to find Clear Cardio and its videos - \[01:00:40] Stress tests are absolutely useless **Key Takeaways** The real lesson here is to ask whether you actually have the disease before you argue...