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

Introduction

Dr. Warrick Bishop is a practicing cardiologist and author dedicated to educating patients about heart health. In this episode, he explores the distinction between two mechanisms of plaque-related heart attacks: plaque rupture and plaque erosion. Understanding these different pathways is crucial because both can lead to heart attacks, yet they present differently and may require different treatment approaches.

Key Takeaways:

• Plaque forms at points of arterial stress and wear, involving cholesterol accumulation and inflammation, typically developing in the middle muscular layer of the artery wall.

• Approximately 60% of heart attacks result from plaque rupture, where a thin fibrous cap breaks down, allowing blood to mix with the cholesterol-rich plaque core and form a clot.

• The remaining 40% of heart attacks are caused by plaque erosion, where the fibrous cap remains intact but the protective endothelial lining is lost, triggering clot formation without rupture.

• Plaque rupture typically causes sudden, instantaneous chest pain, while plaque erosion generally presents as progressive, niggly chest pain at rest that develops over hours (unstable angina).

• Ruptured plaques are characterized by a large fatty necrotic core (>30% of total plaque), thin fibrous cap (<65 micrometers), abundant inflammatory cells, and calcium deposits.

• Eroded plaques are more stable phenomena with intact thick fibrous caps, minimal calcification, less inflammation, and scarcity of the aggressive features seen in ruptured plaques.

• Multiple diagnostic tools exist to assess plaque, including cardiac CT imaging, invasive angiography, intravascular ultrasound (IVUS), and optical coherence tomography (OCT), with OCT providing the most detailed imaging including fibrous cap thickness measurement.

• Research demonstrates that aggressive LDL cholesterol lowering using statins and PCSK9 inhibitors can achieve plaque regression and increase fibrous cap thickness in over 50% of patients within 12-18 months.

• Plaque stabilization through cholesterol reduction supports the LDL hypothesis and suggests that optimal therapy may reduce the risk of plaque rupture events.

• Understanding plaque rupture versus erosion explains why patients can feel perfectly well until a clot suddenly forms and restricts blood flow, since normal flow continues until thrombosis occurs.