Many people may have heard the phrase “ coronary artery blockage of one vessel ” or “ coronary artery blockage in three vessels ,” which raises the question: how many main coronary arteries does the human heart actually have, and what are their functions? Understanding "coronary arteries" and their role
The coronary arteries, or coronary arteries (Coronary arteries), carry oxygen-rich blood and nutrients to the heart muscle, enabling the heart to contract and pump blood continuously throughout the body.
Clarifying the three main coronary arteries The answer to “how many coronary arteries are there?” depends on how they are counted. However, when considering the main vessels doctors refer to when assessing coronary artery disease, there are typically three: the LAD, LCx, and RCA, described as follows. 1. Left Anterior Descending artery (LAD) The Left Anterior Descending artery, or LAD, branches from the main left coronary artery and runs down the front of the heart. It supplies blood to the front wall and lower part of the left ventricle, as well as the front part of the heart's septum. This artery covers a broad area of the heart muscle. An acute blockage, especially near its origin, can cause severe heart muscle damage and be life-threatening.
2. Left Circumflex artery (LCx)
The Left Circumflex artery, or LCx, is another branch of the main left coronary artery. It curves around to the side and back of the heart, supplying blood to the left atrium and the side wall and some of the back wall of the left ventricle. The size and branching pattern of this artery can vary between individuals.
3. Right Coronary Artery (RCA)
The Right Coronary Artery, or RCA, supplies blood to the right atrium, right ventricle, and parts of the lower wall of the left ventricle and the posterior septum. It may also supply areas that regulate the heart's rhythm. The branching pattern of this artery can differ from person to person. Who is at risk for coronary artery disease?
Coronary artery disease usually results from the buildup of fat, cholesterol, and other substances on the artery walls, forming plaques that narrow the vessel lumen. This reduces blood and oxygen supply to the heart muscle. Risk factors for coronary artery disease fall into two main categories:
1. Non-modifiable risk factors Increasing age
Men tend to develop the disease earlier than women
Women after menopause have an increased risk Family history of heart disease at a young age, especially if a father or male sibling was diagnosed before age 55, or a mother or female sibling before age 65
Genetic factors related to heart disease
2. Modifiable risk factors High blood pressure
High LDL cholesterol or triglycerides
- Diabetes or prediabetes
- Overweight or obesity
- Physical inactivity or prolonged sitting
- Smoking or prolonged exposure to secondhand smoke
- Consuming excessive saturated fat, sugar, or refined carbohydrates
Excessive alcohol consumption
- Inadequate sleep or chronic sleep problems
- Chronic stress, depression, or anxiety
- Having multiple risk factors together increases overall risk. However, having risk factors does not guarantee disease; proper assessment and care are important.
- How to prevent and reduce the risk of coronary artery disease
- Coronary artery disease can be prevented or slowed through continuous lifestyle changes and risk factor control, such as:
- Avoid smoking and exposure to smokeSmoking damages artery walls and increases clotting risk. Smokers should consult doctors or smoking cessation clinics to improve chances of quitting successfully.
- Choose heart-healthy foods
- Increase intake of vegetables, fruits, whole grains, nuts, fish, and lean protein while reducing fried foods, saturated and trans fats, processed meats, sweets, sugary drinks, and high-salt foods.
- Exercise regularly
- Adults should aim for at least 150 minutes of moderate activity or 75 minutes of vigorous activity weekly, and reduce prolonged sitting. Those with medical conditions or chest pain should consult a doctor before starting exercise.
Maintain a healthy weight
Losing excess weight helps control blood pressure, blood sugar, and lipid levels, reducing plaque buildup.
- People with diabetes, hypertension, or high cholesterol should regularly monitor, take prescribed medications, and not adjust or stop treatment without medical advice—even if asymptomatic.
Get sufficient sleep and manage stress
- Maintain regular sleep schedules and adequate rest. Find healthy ways to cope with stress. Consult specialists if experiencing persistent insomnia, stress, anxiety, or depression.
How is coronary artery disease diagnosed?
- Those with chest tightness, unusual fatigue, or multiple risk factors should see a doctor for history taking, physical exam, and individualized risk assessment. The doctor may check blood pressure, blood sugar, and lipid levels and consider heart tests based on symptoms and appropriateness.
Self-selecting tests like stress tests, coronary CT scans, or other specialized exams is not recommended, as not everyone requires the same tests. Decisions depend on symptoms, age, risk factors, and physician judgment.Sources:Prince Suvarnabhumi Hospital,
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