Imagine the roads leading to your home becoming narrower and narrower over time—eventually, traffic slows to a crawl, and sometimes stops completely. This is essentially what happens in coronary artery disease (CAD), except the "roads" are the arteries supplying blood to your heart, and the "traffic" is the oxygen-rich blood your heart needs to survive.
Coronary artery disease is the most common type of heart disease and remains the leading cause of death worldwide. In India, the situation is particularly concerning—studies show that CAD affects 2.5% to 12.6% of people in urban areas and 1.4% to 4.6% in rural areas.
In This Article
What Is Coronary Artery Disease?
Coronary artery disease (CAD)—also called coronary heart disease or ischemic heart disease—occurs when the arteries that supply blood to your heart muscle become narrowed or blocked. These coronary arteries are like a crown (corona in Latin) encircling your heart, delivering the oxygen and nutrients it needs to pump effectively.
When these arteries narrow, your heart doesn't get enough blood, especially during physical activity or stress. This can cause chest pain (angina) or, if an artery becomes completely blocked, a heart attack.
How Does CAD Develop?
CAD develops through a process called atherosclerosis—the buildup of fatty deposits (plaque) inside your artery walls. Think of it like rust building up inside old water pipes:
Damage to the artery lining
High blood pressure, smoking, high cholesterol, or diabetes can injure the inner layer of your coronary arteries.
Plaque buildup begins
Cholesterol and other substances accumulate at the site of injury. White blood cells arrive to "clean up," but end up becoming part of the problem.
Plaque grows over time
Over years or decades, the plaque grows larger, narrowing the artery and reducing blood flow.
Plaque may rupture
Some plaques become unstable and can crack or rupture. When this happens, a blood clot forms that can suddenly block the artery—this is a heart attack.
Research note: Studies published in Circulation show that calcium deposits in coronary arteries (coronary artery calcification) are a strong indicator of CAD and can predict future heart events better than many other risk markers.
Risk Factors for Coronary Artery Disease
Some risk factors for CAD you cannot change, but many you can control through lifestyle changes and medication.
Risk Factors You Cannot Change
Age
Risk increases as you get older. Men over 45 and women over 55 are at higher risk.
Gender
Men generally develop CAD earlier than women. After menopause, women's risk increases significantly.
Family History
If close relatives had heart disease at a young age (before 55 in men, before 65 in women), your risk is higher.
Genetics
Certain genetic variations, including those on chromosome 9p21.3, are linked to earlier onset of CAD.
Risk Factors You Can Control
Forces your heart to work harder and damages artery walls. Research shows 13.1% to 36.9% of Indians with CAD have hypertension.
Too much "bad" LDL cholesterol leads to plaque buildup. Low "good" HDL cholesterol fails to remove excess cholesterol.
Damages blood vessel walls, raises blood pressure, and makes blood more likely to clot. 8.9% to 40.5% of CAD patients in India are smokers.
High blood sugar damages blood vessels and nerves. Up to 24% of CAD patients have diabetes.
Extra weight strains your heart and is often linked with other risk factors. A sedentary lifestyle weakens your heart muscle.
The Indian Context
- • CAD tends to occur 10-15 years earlier in Indians compared to Western populations
- • Many Indians have a genetic tendency toward diabetes and abnormal cholesterol levels
- • Lifestyle changes—including less physical activity and more processed food—are increasing CAD rates
- • Delayed hospital arrival (average 6 hours after heart attack symptoms) reduces treatment effectiveness
Fatigue, shortness of breath, and chest discomfort are common symptoms of coronary artery disease.
Symptoms of Coronary Artery Disease
CAD can develop for decades without causing symptoms. Many people first learn they have CAD when they experience a heart attack. However, there are warning signs to watch for.
Angina (Chest Pain)
The most common symptom of CAD is angina—chest pain or discomfort caused by reduced blood flow to the heart.
How angina feels:
- • Pressure, squeezing, or tightness in the chest
- • Pain that may spread to your shoulders, arms, neck, jaw, or back
- • A heavy weight on your chest
- • Sometimes described as indigestion or heartburn
Stable Angina
Occurs predictably during physical activity or stress. Typically lasts a few minutes and goes away with rest. This is the most common form.
Unstable Angina ⚠️
More serious—occurs unexpectedly, even at rest, lasts longer, and doesn't go away with rest. This is a medical emergency.
Other Symptoms
Shortness of breath
When your heart can't pump enough blood, you may feel breathless, especially during activity.
Fatigue
Unusual tiredness, especially with exertion.
Dizziness
Reduced blood flow can affect your brain.
Rapid or irregular heartbeat
Your heart may beat faster to compensate for reduced blood flow.
Symptoms in Women
Women may experience CAD differently than men. Women are more likely to have nausea, back or jaw pain, shortness of breath without chest pain, and extreme fatigue. Because these symptoms are less "classic," women's heart disease is often missed or diagnosed later.
Silent CAD
Some people—particularly those with diabetes—may have "silent" CAD with no symptoms at all until they have a heart attack. This is why regular checkups and risk factor management are so important.
Diagnosing Coronary Artery Disease
If your doctor suspects CAD based on your symptoms, risk factors, and physical examination, several tests can confirm the diagnosis and assess its severity.
Initial Tests
ECG/EKG
Records heart's electrical activity. Shows signs of current or previous heart attack.
Blood Tests
Check cholesterol levels, blood sugar, and markers of heart damage.
Chest X-ray
Shows the size and shape of your heart and lungs.
Stress Testing
Exercise Stress Test (TMT)
You walk on a treadmill while connected to an ECG. Shows how your heart responds to physical exertion.
Stress Echocardiogram
Combines a stress test with ultrasound images of your heart.
Nuclear Stress Test
Uses a small amount of radioactive material to create images of blood flow to your heart.
Imaging Tests
Echocardiogram
Uses sound waves to create moving pictures of your heart. Shows how well your heart pumps.
CT Coronary Angiography
A specialized CT scan that takes detailed pictures of your coronary arteries without invasive procedures.
Coronary Calcium Score
A CT scan that measures calcium deposits in your coronary arteries. Higher scores indicate more extensive atherosclerosis.
The Gold Standard: Coronary Angiography
The definitive test for CAD. A thin tube (catheter) is inserted through an artery in your wrist or groin and guided to your heart. Dye is injected, and X-ray images show exactly where and how severely your arteries are blocked.
During angiography, additional tests like FFR (Fractional Flow Reserve), IVUS, or OCT may be performed to assess blockage severity.
Your cardiologist will discuss treatment options tailored to your specific condition and needs.
Treatment Options for Coronary Artery Disease
Treatment for CAD aims to relieve symptoms, slow or stop disease progression, and prevent heart attacks. Your treatment plan will depend on the severity of your disease, your symptoms, and your overall health.
Lifestyle Changes
For everyone with CAD—regardless of severity—lifestyle modifications are essential:
Heart-Healthy Diet
More fruits, vegetables, whole grains, lean proteins. Choose healthy fats (olive oil, nuts, fish). Limit salt, sugar, and processed foods.
Regular Exercise
Aim for at least 150 minutes of moderate activity per week. Even walking helps—start slowly if you've been inactive.
Quit Smoking
One of the most impactful changes you can make. Your heart disease risk begins dropping within weeks of quitting.
Manage Stress
Practice relaxation techniques. Get adequate sleep. Seek support when needed.
Medications
| Medication Type | Purpose |
|---|---|
| Blood thinners (Aspirin, Clopidogrel) | Prevent blood clots from forming |
| Statins | Lower LDL cholesterol and stabilize plaques |
| Beta-blockers | Slow heart rate and lower blood pressure |
| ACE inhibitors/ARBs | Relax blood vessels |
| Nitrates | Relieve angina by widening blood vessels |
Procedures and Surgery
Angioplasty and Stenting (PCI)
A balloon is inflated inside the blocked artery to widen it. A stent (small mesh tube) is usually placed to keep the artery open.
Most patients go home the next day.
Coronary Artery Bypass (CABG)
Open-heart surgery that creates new pathways for blood to flow around blocked arteries using blood vessels from your chest, leg, or arm.
Recommended for severe blockages or multiple affected arteries.
Many people with CAD live long, active lives by managing their condition effectively with lifestyle changes and treatment.
Living with Coronary Artery Disease
A CAD diagnosis isn't a death sentence—it's a call to action. Many people with CAD live long, active lives by managing their condition effectively.
Cardiac Rehabilitation
After a heart attack or heart procedure, cardiac rehabilitation is highly beneficial. This supervised program includes:
- • Monitored exercise training
- • Education about heart-healthy living
- • Counseling to reduce stress
- • Support for making lifestyle changes
Take Medications as Prescribed
Don't stop or change doses without talking to your doctor.
Keep Follow-up Appointments
Regular monitoring helps catch problems early.
Monitor Risk Factors
Check blood pressure, cholesterol, and blood sugar regularly.
Know Warning Signs
Learn the symptoms of a heart attack and act immediately if they occur.
Frequently Asked Questions
Can coronary artery disease be reversed? ▼
While you cannot completely remove plaque from your arteries, you can stop CAD from getting worse and even shrink plaques somewhat. Aggressive lifestyle changes—especially diet changes—combined with medications like high-dose statins have been shown to stabilize and slightly reduce plaque. The key is starting early and being consistent.
What is the difference between CAD and a heart attack? ▼
CAD is the underlying condition—the gradual narrowing of your heart's arteries due to plaque buildup. A heart attack (myocardial infarction) is an event that occurs when a coronary artery becomes suddenly and completely blocked, usually when a plaque ruptures and a blood clot forms. Think of CAD as the disease and heart attack as one possible consequence.
How quickly does coronary artery disease progress? ▼
CAD typically develops over decades. The process begins as early as childhood or adolescence and slowly progresses. How fast it progresses depends largely on your risk factors. Someone who smokes, has uncontrolled diabetes and high blood pressure will see faster progression than someone who controls these factors.
Is coronary artery disease hereditary? ▼
Genetics play a significant role. If your close relatives had heart disease at a young age, your risk is higher. However, genes aren't destiny. Even with a family history, controlling your modifiable risk factors can substantially reduce your risk.
Can young people get coronary artery disease? ▼
Yes. While CAD is more common in older adults, young people—even those in their 20s and 30s—can develop it, especially if they have risk factors like diabetes, high cholesterol, smoking, or a strong family history. In India, CAD occurs about 10-15 years earlier than in Western countries.
What foods should I avoid with coronary artery disease? ▼
Limit or avoid: fried foods and foods high in saturated or trans fats, red meat and processed meats, sugary drinks and sweets, highly processed foods, excessive salt, and alcohol (if consumed, drink in moderation).
How often should I see my cardiologist with CAD? ▼
Most people with stable CAD see their cardiologist every 6-12 months, though this varies based on disease severity and symptoms. More frequent visits may be needed if you've recently had a procedure, are experiencing new symptoms, or are adjusting medications.
Can I exercise with coronary artery disease? ▼
Yes—exercise is actually beneficial for CAD. Regular physical activity strengthens your heart, improves blood flow, and helps control risk factors. Start slowly, especially if you've been inactive, and talk to your doctor about what activities are safe for you. Cardiac rehabilitation can help you exercise safely and confidently.
References
- Onnis C, Virmani R, Kawai K, et al. Coronary Artery Calcification: Current Concepts and Clinical Implications. Circulation. 2024;149(3):251-266. PMID: 38227718
- Malakar AK, Choudhury D, Halder B, et al. A review on coronary artery disease, its risk factors, and therapeutics. Journal of Cellular Physiology. 2019;234(10):16812-16823. PMID: 30790284
- Rao M, Xavier D, Devi P, et al. Prevalence, treatments and outcomes of coronary artery disease in Indians: A systematic review. Indian Heart Journal. 2015;67(4):302-310. PMID: 26304561
- Collet C, Munhoz D, Mizukami T, et al. Influence of Pathophysiologic Patterns of Coronary Artery Disease on Immediate Percutaneous Coronary Intervention Outcomes. Circulation. 2024;150(8):586-597. PMID: 38742491
- Gaudel P, Neupane S, Koivisto AM, et al. Effects of a lifestyle-related risk factor modification intervention on lifestyle changes among patients with coronary artery disease. Patient Education and Counseling. 2021;104(6):1406-1414. PMID: 33342580
- Al-Lamee RK. Angina pectoris 2023: With and without obstructive coronary artery disease. Vascular Pharmacology. 2024;155:107285. PMID: 38431201
About the Author
Dr. Shailesh Singh is a senior interventional cardiologist practicing at Preventia Clinic (Noida) and Fortis Escorts Heart Institute (Delhi). With extensive experience in coronary interventions including angioplasty, stenting, and complex PCI, he provides comprehensive care for patients with coronary artery disease across Delhi NCR.
Learn more about Dr. Singh →Concerned About Your Heart Health?
If you have risk factors for coronary artery disease or are experiencing symptoms like chest pain or shortness of breath, early detection and treatment can save your life. Dr. Shailesh Singh offers comprehensive cardiac evaluation with same-week appointments available.
Locations: Preventia Clinic, Sector 76, Noida | Fortis Escorts Heart Institute, Delhi
Medical Disclaimer: This article is for informational purposes only and should not be considered medical advice. Every patient's situation is unique. If you're experiencing chest pain or other cardiac symptoms, seek medical attention promptly.