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Why “Normal” Cholesterol Can Miss Heart Attack Risk (ApoB Explained)

Family and lifestyle medicine doctor Adrian explains why many people who later have heart attacks previously had “normal” LDL cholesterol: the standard test measures how much cholesterol is inside LDL particles, not how many particles are circulating. Because LDL particle size varies, two people can share the same LDL-C while one has many more small, dense particles, increasing plaque and inflammation risk. He cites evidence from the Framingham Heart Study and hospital data showing many coronary artery disease patients present with acceptable LDL levels. He argues apolipoprotein B (ApoB), with one ApoB molecule per atherogenic particle, directly counts particle number and predicts cardiovascular risk even after accounting for LDL-C, and notes guidelines recognize ApoB as a target, especially in diabetes, high triglycerides, or metabolic syndrome.

00:00 Normal LDL Myth

00:59 What LDL Measures

01:34 Particle Size Problem

02:10 Evidence It Fails

02:50 Hospital Reality Check

03:49 ApoB Explained

04:28 ApoB Beats LDL

05:38 Who Should Test

06:25 Lowering ApoB

07:10 Key Takeaways

07:53 Final Wrap Up

Cromwell, W. C., Otvos, J. D., Keyes, M. J., Pencina, M. J., Sullivan, L., Vasan, R. S., Wilson, P. W. F., & D'Agostino, R. B. (2007). LDL particle number and risk of future cardiovascular disease in the Framingham Offspring Study: Implications for LDL management. *Journal of Clinical Lipidology*, *1*(6), 583–592. https://doi.org/10.1016/j.jacl.2007.10.001

Johannesen, C. D. L., Langsted, A., Nordestgaard, B. G., & Mortensen, M. B. (2024). Excess apolipoprotein B and cardiovascular risk in women and men. *Journal of the American College of Cardiology*, *83*(23), 2262–2273. https://doi.org/10.1016/j.jacc.2024.03.423

Sachdeva, A., Cannon, C. P., Deedwania, P. C., Labresh, K. A., Smith, S. C., Dai, D., Hernandez, A., & Fonarow, G. C. (2009). Lipid levels in patients hospitalized with coronary artery disease: An analysis of 136,905 hospitalizations in Get With The Guidelines. *American Heart Journal*, *157*(1), 111–117.e2. https://doi.org/10.1016/j.ahj.2008.08.010

**This video is for informational and educational purposes only. It is not intended to diagnose, treat, cure, or prevent any disease and should not be used as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have seen or heard in this content. Dr. Adrian Laurence provides general health information and does not establish a doctor–patient relationship through this video or any related content.**

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