What Is Coronary Artery Disease (CAD)?

Coronary Artery Disease (CAD) is a common heart condition in which the blood vessels that supply oxygen-rich blood to the heart muscle become narrowed or blocked. In most cases, CAD develops because of atherosclerosis, a process in which plaque made up of cholesterol, fats, calcium, and other substances gradually builds up inside the artery walls.

When plaque increases, the coronary arteries can become narrower, reducing the amount of blood and oxygen reaching the heart. This may cause symptoms such as chest discomfort, shortness of breath, tiredness, or reduced exercise tolerance. In some people, CAD may remain silent until a serious complication such as a heart attack occurs.

Coronary artery disease is also commonly called coronary heart disease (CHD) or ischemic heart disease. It is one of the most important conditions affecting cardiovascular health.

Understanding CAD early can help people identify their risk factors, undergo appropriate evaluation, and make lifestyle changes that support long-term heart health.

How Does Coronary Artery Disease Develop?

The heart needs a continuous supply of oxygen and nutrients to function properly. This supply comes through the coronary arteries.

In a healthy artery, blood flows freely through the vessel. Over time, however, factors such as high LDL cholesterol, high blood pressure, smoking, diabetes, obesity, and physical inactivity can contribute to damage and plaque formation.

The process generally develops gradually:

1. The inner lining of an artery becomes damaged or stressed.
2. Cholesterol and other substances accumulate in the artery wall.
3. Plaque develops inside the artery.
4. The artery becomes narrower and less flexible.
5. Blood flow to the heart muscle may decrease.
6. A blood clot can sometimes form around a damaged plaque and suddenly block blood flow.

This process is known as atherosclerosis. Plaque buildup is the leading cause of coronary heart disease.

What Are the Main Causes of Coronary Artery Disease?

The most common underlying cause of CAD is atherosclerosis. However, several factors can increase the likelihood of developing plaque and coronary artery problems.

1. High LDL Cholesterol

LDL cholesterol is often referred to as "bad cholesterol." When LDL levels remain elevated, cholesterol can contribute to plaque formation inside the arteries.

2. High Blood Pressure

Long-term high blood pressure can place additional stress on artery walls. Managing blood pressure is an important part of cardiovascular disease prevention.

3. Diabetes

High blood sugar can damage blood vessels and is an important risk factor for coronary artery disease.

4. Smoking

Smoking damages blood vessels and increases cardiovascular risk. Exposure to secondhand smoke can also contribute to heart disease risk.

5. Unhealthy Diet

A diet high in saturated fats, excessive sodium, highly processed foods, and excess calories may contribute to cholesterol abnormalities, obesity, and other cardiovascular risk factors.

6. Physical Inactivity

A sedentary lifestyle can contribute to obesity, diabetes, high blood pressure, and unfavorable cholesterol levels.

7. Overweight and Obesity

Excess body weight is associated with several conditions that increase cardiovascular risk, including high blood pressure, diabetes, and abnormal cholesterol levels.

8. Family History and Age

Some people have a higher risk because of family history or inherited conditions. Risk also generally increases with age.

The CDC identifies high blood pressure and cholesterol, smoking, diabetes, obesity, unhealthy diet, and physical inactivity among important CAD risk factors.

What Are the Symptoms of Coronary Artery Disease?

CAD symptoms can vary significantly from one person to another. Some people may have no noticeable symptoms for years.

When the coronary arteries cannot supply enough blood to meet the heart's needs, a person may experience angina, which is chest discomfort caused by reduced blood flow to the heart muscle.

Common symptoms may include:

• Chest pain or pressure
• Tightness or squeezing in the chest
• Shortness of breath
• Unusual tiredness
• Pain or discomfort in the neck, jaw, shoulders, arms, or back
• Dizziness or lightheadedness
• Cold sweating
• Nausea

Symptoms may become more noticeable during physical activity or emotional stress and may improve with rest. However, persistent or severe chest discomfort can be a warning sign of a heart attack and requires urgent medical attention.

Can CAD Have No Symptoms?

Yes. Coronary artery disease can sometimes be silent, meaning a person may not experience obvious symptoms before a serious cardiovascular event.

This is one reason regular health assessments are important, particularly for people who have risk factors such as diabetes, high blood pressure, high cholesterol, smoking, obesity, or a family history of heart disease.

What Are the Risk Factors for CAD?

Risk factors can be divided into factors that can be changed or managed and factors that cannot be changed.

Modifiable Risk Factors

These include:

• Smoking
• High LDL cholesterol
• High blood pressure
• Diabetes
• Physical inactivity
• Obesity
• Unhealthy eating habits
• Excessive alcohol consumption
• Poor management of existing health conditions

Many of these factors can be improved through lifestyle changes and appropriate medical care.

Non-Modifiable Risk Factors

These include:

• Increasing age
• Family history of cardiovascular disease
• Genetic conditions
• Certain inherited cholesterol disorders

Having a risk factor does not mean that a person will definitely develop CAD. However, multiple risk factors can increase overall cardiovascular risk.

How Is Coronary Artery Disease Diagnosed?

A doctor may evaluate CAD using a combination of medical history, physical examination, risk-factor assessment, blood tests, and heart investigations.

Depending on symptoms and individual risk, evaluation may include the following:

• Blood Tests

Blood tests may assess cholesterol, triglycerides, blood glucose, and other health markers.

• Electrocardiogram (ECG)

An ECG records the heart's electrical activity and can provide useful information about heart rhythm and certain signs of heart problems.

• Stress Test

A stress test evaluates how the heart performs when it is working harder. It may involve exercise or medication that increases the workload of the heart.

• Coronary Calcium Scan

A coronary calcium scan uses CT imaging to detect calcium deposits in the coronary arteries. It can help assess cardiovascular risk in appropriate patients.

• CT Coronary Angiography

Coronary CT angiography creates detailed images of the coronary arteries and can help identify narrowing or plaque.

• Coronary Angiography

Invasive coronary angiography uses contrast dye and cardiac catheterization to visualize coronary arteries and identify blockages. It is often used when other tests suggest a significant likelihood of CAD.

The appropriate test depends on a person's symptoms, medical history, risk factors, and clinical evaluation.

What Are the Treatment Options for Coronary Artery Disease?

Treatment for CAD depends on the severity of the disease, symptoms, overall cardiovascular risk, and other health conditions.

Treatment may include lifestyle changes, medicines, procedures, or a combination of these approaches.

1. Heart-Healthy Lifestyle Changes

Lifestyle management is an important part of CAD care.

Important habits include:

• Eating a balanced heart-healthy diet
• Increasing physical activity as medically appropriate
• Maintaining a healthy body weight
• Avoiding tobacco
• Managing blood pressure
• Managing blood sugar
• Controlling cholesterol
• Getting adequate sleep
• Managing stress
• Attending recommended health checkups

2. Medicines

Depending on the individual's condition, doctors may prescribe medicines to control blood pressure, cholesterol, chest pain, blood sugar, or other cardiovascular risk factors.

Medication should always be selected and adjusted by a qualified healthcare professional.

3. Angioplasty and Stenting

Percutaneous coronary intervention (PCI), commonly known as angioplasty, can be used to open certain narrowed or blocked coronary arteries. A stent may be placed to help keep the artery open.

4. Coronary Artery Bypass Grafting

Coronary artery bypass grafting (CABG) is a surgical procedure that creates a new route for blood to flow around severely narrowed or blocked coronary arteries. It is commonly considered for people with severe disease involving multiple coronary arteries or other specific patterns of disease.

5. Individualized Non-Surgical Care

Non-invasive management of coronary artery disease (CAD) may include heart-healthy lifestyle changes, prescribed medications, risk-factor control, EECP therapy, Chelation therapy, Ozone therapy  The appropriate treatment depends on the severity of the disease and should be decided after a medical evaluation.

Can Coronary Artery Disease Be Prevented?

In many people, the risk of CAD can be reduced by controlling major cardiovascular risk factors.

Practical steps include:

• Stop smoking and avoid tobacco exposure.
• Monitor cholesterol regularly.
• Keep blood pressure under control.
• Manage diabetes and blood sugar.
• Eat more vegetables, fruits, whole grains, legumes, and other nutrient-rich foods.
• Limit foods high in saturated fat, trans fat, excess salt, and added sugars.
• Exercise regularly according to your healthcare professional's advice.
• Maintain a healthy weight.
• Manage stress.
• Get regular health assessments if you have cardiovascular risk factors.

Starting healthy habits early can help reduce cardiovascular risk over time.

When Should You Seek Medical Help?

Do not ignore new, severe, or unexplained chest discomfort.

Seek emergency medical care if chest discomfort is severe, persistent, occurs at rest, or is accompanied by symptoms such as shortness of breath, cold sweating, nausea, dizziness, or pain spreading to the arm, jaw, neck, shoulder, or back.

A heart attack can occur when blood flow through a coronary artery becomes suddenly blocked. Coronary artery disease is the most common underlying cause of heart attacks.

 

Dr. Abhijit Khabale Patil

M.D. Medicine (Ayu)

Shanikrupa Heartcare