Coronary Artery Calcification

Definition of Coronary Artery Calcification

Coronary artery calcification is a pathological process where calcium deposits accumulate in the walls of the coronary arteries, the blood vessels that supply the heart muscle. Atherosclerosis, a disease characterized by the formation of plaques composed of fats, cholesterol, calcium, and other substances, typically narrows and hardens the arteries.

Epidemiology

In Switzerland, coronary artery calcification, a marker of atherosclerosis, mainly affects the elderly. The prevalence is higher in men and people over 50 years old. The main risk factors include hypertension, diabetes, obesity, smoking, and hypercholesterolemia. These factors are similar to those observed in other European countries. Cardiovascular diseases, of which calcification is an important indicator, cause 25 to 30% of deaths in Switzerland. Despite the decrease in cardiovascular mortality due to prevention and medical care, the risk remains high. Calcification is a major risk factor for myocardial infarction. Screening programs, including the use of CT scans to detect calcifications, are more frequent.

Causes of Coronary Artery Calcification

Coronary artery calcification is caused by a degenerative process related to atherosclerosis. Calcium deposits accumulate in the arterial walls. The process begins with the accumulation of plaques made up of lipids and other substances in the arteries. These plaques eventually harden over time. This phenomenon also results from an alteration in calcium and phosphate metabolism in the body. This often occurs in conditions affecting the balance of these minerals. As calcium deposits increase, the walls of the arteries lose their elasticity. This loss of elasticity can disrupt blood flow to the heart.

Risk Factors

The main risk factors for coronary artery calcification include:

Advanced age: The risk increases with age, as arteries become more rigid.
High blood pressure: High blood pressure damages the arteries and promotes the accumulation of calcified plaques.
Hypercholesterolemia: A high cholesterol level, especially LDL (“bad cholesterol”), contributes to plaque formation in the arteries.
Diabetes: Diabetes, especially type 2, is a major factor in arterial calcification.
Smoking: Tobacco damages the arterial walls and promotes atherosclerosis, which can lead to calcification.
Family history: A family history of cardiovascular diseases increases the risk.
Obesity: Overweight and obesity are often linked to other risk factors such as hypertension and diabetes.
Physical inactivity: Lack of physical activity can increase the risk of atherosclerosis and calcification.
Chronic kidney disease: They are associated with imbalances of calcium and phosphate, which promotes calcium deposits in the arteries.
Chronic inflammation: Some chronic inflammatory diseases also increase the risk of arterial calcification.

These risk factors contribute to atherosclerosis and the formation of calcified deposits that can increase the risk of cardiovascular diseases, such as myocardial infarction.

Symptoms of Coronary Artery Calcification

The symptoms of coronary artery calcification depend on the extent of the obstruction and the severity of the disease. In many cases, calcifications are asymptomatic, without causing clinical signs. These symptoms may be related to a restriction of blood flow to the heart. These manifestations vary according to the degree of calcification and arterial obstruction. The most common symptoms include:

Chest pain (angina pectoris): This is the most common symptom. It usually manifests as a feeling of pressure, tightness, or burning in the chest. The pain may radiate to the left arm, neck, jaw, or back.
Shortness of breath: A lack of breath, especially during physical activity, can be a sign that the heart is not receiving enough oxygenated blood due to arterial obstruction.
Fatigue: Unexplained fatigue, especially during moderate or light efforts, can be a sign of advanced coronary calcification.
Palpitations: A sensation of rapid or irregular heartbeats may occur.
Dizziness or vertigo: Poor blood circulation to the brain can cause dizziness or vertigo.
Nausea: Nausea, sometimes associated with chest pain, can be a sign of heart disease.
Excessive sweating: Sudden and excessive sweating, especially without apparent cause, can be a sign of an underlying heart problem.
Heart attack symptoms: Significant calcification can lead to a myocardial infarction (heart attack). Symptoms include severe chest pain, difficulty breathing, cold sweats, nausea, and pain radiating to other parts of the body.

If you or someone experiences symptoms such as chest pain or shortness of breath, it is crucial to quickly consult a healthcare professional, as this may indicate a medical emergency.

Radiological Imaging

Radiological imaging plays a key role in the detection and evaluation of coronary artery calcification. The main techniques used are:

Chest X-ray: Although less precise for directly visualizing coronary calcifications, X-rays can sometimes reveal calcifications in the aorta or other arteries.
Coronary CT scan: This is the reference examination for detecting and quantifying coronary calcifications. The calcium score (Agatston score) is often calculated to assess the extent of calcium deposits. The higher the score, the greater the risk of cardiovascular diseases.

These imaging techniques allow for the detection of calcification at an early stage, assessment of its extent, and guidance of therapeutic management to prevent cardiac complications.

Prevention of Coronary Artery Calcification

Prevention of coronary artery calcification is primarily based on managing factors that contribute to atherosclerosis and cardiovascular health. Here are the key measures:

Adopt a balanced diet: Following a diet rich in fruits, vegetables, whole grains, and low in saturated fats and cholesterol can help reduce plaque buildup in the arteries.
Regular exercise: Engaging in moderate to intense physical activity, such as walking, running, or cycling, helps maintain healthy arteries and improves blood circulation.
Maintain a healthy weight: Preventing obesity helps reduce the risk of metabolic diseases that contribute to calcification.
Control blood pressure and cholesterol: Managing blood pressure and cholesterol levels through medication or lifestyle changes is crucial to prevent arterial calcification.
Quit smoking: Smoking accelerates the hardening of arteries, and quitting tobacco is essential to reduce this risk.
Control diabetes: Managing blood sugar is fundamental to preventing damage to arteries and calcification, especially in diabetics.
Stress reduction: Managing stress through relaxation techniques can have a beneficial effect on heart health.

These preventive measures help reduce the risk of coronary artery calcification and, consequently, prevent serious cardiovascular diseases such as myocardial infarction.

Conclusion

In conclusion, coronary artery calcification is a key indicator of cardiovascular risk, often linked to atherosclerosis. Its early detection through radiological imaging allows for better assessment of the risk of serious heart diseases. These diseases include myocardial infarction, which is a serious event. Prevention is based on managing a healthy lifestyle, with a balanced diet and regular physical activity. Quitting smoking and controlling diabetes, hypertension, and cholesterol are essential. Adopting these preventive measures reduces the risk of complications and maintains good heart health.

Finally, if you have symptoms or concerns, consulting a general practitioner allows for an accurate diagnosis and appropriate advice.

Source: UpToDate