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Atherogenesis – How Atherosclerosis Develops

Atherogenesis is the process by which atherosclerosis develops – a chronic condition in which fatty plaques build up inside artery walls, narrowing blood vessels and raising cardiovascular risk.

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Things worth knowing about "Atherogenesis"

Atherogenesis is the process by which atherosclerosis develops – a chronic condition in which fatty plaques build up inside artery walls, narrowing blood vessels and raising cardiovascular risk.

What is Atherogenesis?

Atherogenesis refers to the step-by-step development of atherosclerosis – a chronic disease in which fat, cholesterol, calcium, and other substances accumulate within artery walls, forming deposits known as plaques. Over time, these plaques narrow the arterial lumen, restrict blood flow, and can trigger life-threatening events such as heart attack or stroke.

Mechanism of Atherogenesis

Atherogenesis is a multistage process that may unfold over decades. The key phases include:

1. Endothelial Dysfunction

The first step involves damage to the endothelium – the thin layer of cells lining the inner surface of blood vessels. Triggers include high blood pressure, elevated LDL cholesterol, smoking, diabetes mellitus, and chronic inflammation. A damaged endothelium becomes more permeable and produces less of the vasodilatory molecule nitric oxide.

2. LDL Infiltration and Oxidation

As the endothelium becomes more permeable, LDL particles (low-density lipoprotein) penetrate the vessel wall and are oxidized by reactive oxygen species. The resulting oxidized LDL (oxLDL) is strongly pro-inflammatory.

3. Inflammatory Response and Foam Cell Formation

Oxidized LDL triggers an immune response: monocytes migrate from the bloodstream into the vessel wall and differentiate into macrophages. These cells engulf oxLDL and transform into lipid-laden foam cells, which accumulate in the vessel wall and form the earliest visible lesion – the fatty streak.

4. Plaque Development and Fibrosis

As the process continues, smooth muscle cells migrate into the vessel wall and produce connective tissue, forming a fibrous cap over the lipid-rich core. Calcium deposits may further harden the plaque over time.

5. Plaque Rupture and Thrombotic Complications

Unstable plaques are prone to rupture. When a plaque ruptures, it triggers blood clot formation, potentially leading to a thrombus that completely occludes the artery – resulting in a heart attack or stroke.

Risk Factors for Atherogenesis

Several factors promote the initiation and progression of atherosclerosis:

Elevated LDL cholesterol (hypercholesterolaemia)
Arterial hypertension (high blood pressure)
Smoking
Diabetes mellitus and insulin resistance
Obesity
Physical inactivity
Genetic predisposition
Chronic inflammation (e.g., elevated CRP levels)
Older age and male sex

Diagnosis

Atherogenesis is largely a silent process that remains asymptomatic for many years. Several methods are available for early detection and cardiovascular risk assessment:

Blood tests: LDL, HDL, total cholesterol, triglycerides, and C-reactive protein (CRP)
Carotid intima-media thickness (IMT) measured by ultrasound
Ankle-brachial index (ABI) to detect peripheral arterial disease
Coronary artery calcium scoring (CT-based)
Stress ECG and coronary angiography in advanced disease

Treatment and Prevention

The progression of atherogenesis can be slowed or partially halted through targeted interventions:

Lifestyle Modifications

Heart-healthy diet (Mediterranean diet, low in saturated fat)
Regular physical activity
Smoking cessation
Weight reduction in overweight individuals

Medical Therapy

Statins: Lower LDL cholesterol and reduce vascular wall inflammation
Antihypertensives: Blood pressure-lowering medications
Antidiabetics: Blood glucose management in diabetes mellitus
Antiplatelet agents (e.g., acetylsalicylic acid): Reduce the risk of blood clot formation
PCSK9 inhibitors: Newer agents for significant LDL reduction

References

Libby P. et al. - Atherosclerosis. In: Braunwald's Heart Disease: A Textbook of Cardiovascular Medicine, 12th edition, Elsevier (2022)
World Health Organization (WHO) - Cardiovascular diseases (CVDs): Key Facts. WHO, Geneva (2021). Available at: https://www.who.int/news-room/fact-sheets/detail/cardiovascular-diseases-(cvds)
Lusis A.J. - Atherosclerosis. Nature, 407(6801):233-241 (2000). DOI: 10.1038/35025203

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