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Atherogenic Index of Plasma (AIP) – Definition

The Atherogenic Index of Plasma (AIP) is a blood marker used to assess cardiovascular risk. It reflects the ratio of triglycerides to HDL cholesterol in the blood.

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The Atherogenic Index of Plasma (AIP) is a blood marker used to assess cardiovascular risk. It reflects the ratio of triglycerides to HDL cholesterol in the blood.

What Is the Atherogenic Index of Plasma?

The Atherogenic Index of Plasma (AIP) is a calculated laboratory value used to estimate the risk of developing atherosclerosis (hardening and narrowing of the arteries) and related cardiovascular diseases. It is derived from a standard blood lipid test and is considered more informative than individual cholesterol values alone.

The AIP is calculated using the following formula:
AIP = log₁₀ (Triglycerides [mmol/L] / HDL Cholesterol [mmol/L])

The higher the AIP value, the greater the risk of atherosclerosis and its complications, such as heart attack or stroke.

Background and Clinical Significance

Traditionally, cardiovascular risk is assessed using values such as total cholesterol, LDL cholesterol (often called bad cholesterol), and HDL cholesterol (often called good cholesterol). The AIP complements these assessments by relating triglycerides (blood fats) to HDL cholesterol, providing a more detailed picture of metabolic health.

A low AIP value indicates a favourable lipid profile, while a high AIP value is associated with an increased concentration of small, dense LDL particles. These particles are particularly damaging to blood vessels and promote the formation of atherosclerotic plaques in artery walls.

Reference Values and Interpretation

The commonly used thresholds for the AIP are as follows:

AIP < 0.1: Low cardiovascular risk
AIP 0.1 to 0.24: Intermediate cardiovascular risk
AIP > 0.24: High cardiovascular risk

These thresholds may vary slightly depending on the study and population group. Interpretation should always be made in the context of other clinical findings and risk factors.

Factors Influencing the AIP

Several factors can affect the AIP value:

Diet: A diet high in sugar or fat raises triglyceride levels and can worsen the AIP.
Body weight: Overweight and obesity are associated with a higher AIP.
Physical inactivity: Regular physical activity improves HDL cholesterol and lowers triglycerides.
Insulin resistance and diabetes: Metabolic disorders frequently lead to an elevated AIP.
Alcohol consumption: Excessive alcohol intake increases triglyceride levels.
Medications: Certain drugs such as statins, fibrates, or omega-3 preparations can positively influence the AIP.

Diagnosis and Measurement

The AIP is not measured directly but is calculated from a standard blood lipid profile. The following measurements are required:

Triglycerides (measured in a fasted state)
HDL cholesterol

Blood is usually drawn after a fasting period of 8 to 12 hours to obtain reliable triglyceride values. The AIP is then calculated using the formula described above.

Treatment and Prevention of an Elevated AIP

When the AIP is elevated, lifestyle modifications are the primary approach:

Dietary adjustments: reducing sugar, refined carbohydrates, and saturated fats; increasing fibre and omega-3 fatty acid intake
Regular physical activity (at least 150 minutes of moderate exercise per week, as recommended by the WHO)
Weight loss in cases of overweight or obesity
Smoking cessation and moderate alcohol consumption

If lifestyle changes are insufficient, pharmacological treatments may be considered, including:

Statins to lower LDL cholesterol
Fibrates to reduce triglyceride levels
High-dose omega-3 fatty acids (prescription preparations)

AIP Compared to Other Risk Markers

The AIP is increasingly recognised in research as a superior predictor of cardiovascular events, as it reflects the interplay between atheroprotective (vessel-protecting) and atherogenic (vessel-damaging) lipoproteins. Compared to standard LDL cholesterol measurement, the AIP also identifies individuals with an atherogenic lipid profile who may be at elevated risk despite normal LDL levels.

References

Dobiasova M, Frohlich J. - The plasma parameter log (TG/HDL-C) as an atherogenic index: correlation with lipoprotein particle size and esterification rate in apoB-lipoprotein-depleted plasma. - Clinical Biochemistry, 34(7):583-588, 2001.
Niroumand S et al. - Atherogenic Index of Plasma (AIP): A marker of cardiovascular disease. - Medical Journal of the Islamic Republic of Iran, 29:240, 2015.
World Health Organization (WHO) - Cardiovascular diseases: Prevention and control. Available at: https://www.who.int/health-topics/cardiovascular-diseases

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