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Overview

Atherosclerotic plaque is not simply solidified fat. It is a layered lesion in the vessel wall that often contains a liquid, toxic core. If the thin outer layer (the fibrous cap) ruptures, the liquid necrotic core spills into the bloodstream and triggers rapid clot formation that can fully block the artery and cause a myocardial infarction (heart attack).

Key scientific concepts and phenomena

Plaque structure

Necrotic lipid core
- Liquid cholesterol and dead cells; described metaphorically as a “toxic mess” or “lava.”
Fibrous cap
- A thin layer that separates the necrotic core from the blood; likened to a “volcano plug.”
Peripheral softer layer
- A softer “mush” beneath the fibrous cap that contributes to vulnerability.

“Toxic mess” / “lava” — describes the necrotic lipid core. “Volcano plug” — describes the fibrous cap.

Plaque vulnerability and rupture

A sufficiently thin or weakened fibrous cap can burst under pressure or stress.
Rupture exposes the necrotic core directly to circulating blood.

Acute thrombosis

Exposure of the plaque core to blood immediately provokes clot (thrombus) formation.
The resulting thrombus can occlude the artery within seconds, stopping blood flow.

Consequence

Myocardial infarction: death of heart tissue due to loss of blood supply.

Step-by-step process

A plaque with a liquid necrotic core forms within the vessel wall.
A thin fibrous cap separates the core from the bloodstream.
The fibrous cap ruptures (for example, from a pressure surge).
Toxic core material is released into the blood.
The body rapidly forms a large thrombus to seal the breach.
The thrombus fully blocks the artery → no blood flow → heart attack (infarction).