A friend of our heart: Let's learn exactly about the Circumflex Artery!

Have you ever wondered how amazingly our heart works? Inside that little heart is a very important network of blood vessels. One of the special friends in that network is called the `Circumflex Artery`. Your doctor may also call it the `LCx` artery, or `the circ`. So, today, shall we talk about this `Circumflex Artery` in more detail?

What is `Circumflex Artery`? Let's understand it simply!

Okay, think about it this way. There are two main blood vessels that supply blood to our heart. They are the left and right coronary arteries . The left main coronary artery (the Left Main Coronary Artery) then divides into two smaller branches. One of those branches is the circumflex artery we are talking about. The other branch is the left anterior descending artery (LAD Artery). Doctors call this bifurcation of a blood vessel.

So, the main function of this `(Circumflex Artery)` is to carry oxygenated, clean blood to the back and sides of the pumping chambers on the left side of the heart. It's like a pipe carrying water to a water pump.

What exactly happens with this `Circumflex Artery`?

We have a system that carries blood throughout our entire body, which we call the Circulatory System. This ``Circumflex Artery`` is an important blood vessel connected to the heart in that system.

What happens here may vary slightly depending on each person's body structure . However, in everyone, the following parts of the left side of the heart are supplied with oxygen-rich blood by the ``Circumflex Artery``:

• Left Atrium – This is the upper left chamber of the heart.
• Left Ventricle – This is the large chamber on the lower left side of the heart.
• Papillary muscles inside the left ventricle.

In some people, but not all, this `(Circumflex Artery)` supplies blood to another important part of the heart. That is the `Sinoatrial Node` (`SA Node`). In most people, this job is done by the right main coronary artery. This `(SA Node)` is part of the heart's electrical conduction system that controls our heartbeat. Doctors also call it the ``natural pacemaker`` of the heart.

So where is this `Circumflex Artery` located?

We have already said that the left main coronary artery of our heart divides into two branches. This is where this `(Circumflex Artery)` begins. It is located inside the protective outer layer of the heart called `(Epicardium).` To be precise, it travels through a small canal between the two chambers on the left side of the heart.

Does the `Circumflex Artery` have other branches?

Yes, this `(Circumflex Artery)` also gives off smaller branches. These are called `Marginal Artery Branches`. The number of these branches is not the same for everyone. Some people may have only three branches going to the side called `Obtuse Marginal Branches`. These small branches usually go along the outside of the `Left Ventricle`, towards its `Apex`.

In a very small number of people, this `(Circumflex Artery)` has another branch called the `Left Posterior Ventricular – LPV Artery`. However, in most people, this `(LPV Artery)` (also called the `Posterolateral Artery`) has another branch called the `(Circumflex Artery)` from the right main coronary artery.

What is Coronary Arterial Dominance?

This is a bit of a deep subject, but let's try to understand it simply. The main artery that supplies blood to the middle muscle layer (`Myocardium`) of our heart is the `Posterior Descending Artery` (`PDA`). So, your coronary artery priority is determined by which main artery branch supplies blood to this `(PDA)` in your heart.

This can happen in three main ways:

• Right-dominant circulation: This is what most people (about 85 out of 100) have. Here, the PDA receives blood from the right coronary artery.
• Left-dominant circulation: This occurs in about 1 in 10 people. Here, the PDA is supplied with blood from either the Circumflex Artery or the LAD Artery.
• Codominant circulation: This condition occurs in about 2 out of 10 people. The PDA receives blood from both the right coronary artery and the left circumflex artery or LAD artery.

Think of it like the main water pipe that supplies water to a house. Some houses only get water from the pipe on the right, some from the left, and some from both sides.

Are there other `Circumflex` type arteries in our body?

Yes, in addition to the ``Circumflex Artery'' in the heart, there are other types of arteries in our body called this name.

• Femoral Circumflex Arteries: These are two deep branches that branch off the main blood vessel in our thigh, the Femoral Artery. The Femoral Artery carries blood from the abdomen down the legs. Sometimes, during coronary artery bypass surgery, doctors take a Circumflex Artery from the thigh and use it as a graft.
• Humeral Circumflex Arteries:These are divided by the `(Axillary Artery)` in our armpit area. This `(Axillary Artery)` is what carries blood from the chest to the shoulders and arms. In particular, our upper arm bone (`Humerus`) is mainly supplied with blood by this `(Posterior Humeral Circumflex Artery)`.

What are the diseases that affect the `Circumflex Artery`?

Like other coronary arteries, the circumflex artery can also be affected by a condition called coronary artery disease (CAD). This is when fatty deposits (plaque) build up inside the artery, blocking it. It's like rust clogging a water pipe.

This buildup of plaque and thickening of the artery walls is called atherosclerosis, which means “hardening of the arteries” or “hardening of the arteries.” If this CAD condition is not treated properly, it increases the risk of developing dangerous conditions such as heart attack, heart failure, and stroke .

What are the symptoms of a blockage in the `Circumflex Artery`?

When blood flow is reduced due to this narrowing of the arteries, chest pain can occur. This is called ``Angina''. This ``Angina'' condition can lead to a heart attack. This is a medical emergency, so you should call 911 immediately.

Since a blockage in the circumflex artery is also part of CAD, the symptoms are similar. You may experience things like:

• Angina – This means chest pain or tightness.
• Cold sweat.
• Dizziness or feeling light-headed.
• Excessive fatigue and weakness.
• Rapid or irregular heartbeat (Heart Palpitations).
• Nausea .
• Difficulty breathing .
• Pain in the shoulder or arm.
• Pain in the neck or jaw area.

How do doctors check the health of the `Circumflex Artery`?

Doctors use various imaging tests to check the health of your coronary arteries, including the circumflex artery. Some of them include:

• Cardiac Catheterization: This checks for blockages in the arteries and coronary artery disease.
• Coronary Computed Tomography Angiogram (CCTA): This can produce three-dimensional (3D) images of blood flow in the heart.
• Intravascular Optical Coherence Tomography (IVOCT) or Intravascular Ultrasound (IVUS):These methods can obtain high-definition images of plaque inside an artery.
• Fractional Flow Reserve (FFR): This measures changes in blood pressure within an artery and determines whether a blockage is severe enough to affect heart function.

How are conditions affecting the `Circumflex Artery` treated?

To open a blocked circumflex artery, your doctor may perform a cardiac catheterization and perform interventional procedures such as angioplasty and stent placement. Angioplasty is a procedure that uses a balloon-like device to widen the blocked artery. A stent is a small wire mesh tube that is inserted into the artery to help keep it from narrowing again.

How do we protect our arterial system, including this `Circumflex Artery`?

Here are some things you can do to keep your arteries and entire circulatory system healthy:

• Be physically active most days of the week and maintain a healthy weight.
• Control your alcohol consumption. Get help if you have problems with alcohol use .
• Eat a heart-healthy diet . This can help lower cholesterol levels .
• Be aware of the types of fats you consume and try to reduce unhealthy fats.
• If you have diabetes , control it well.
• Take steps to control high blood pressure, including reducing the amount of sodium (salt) added to your diet.
• If you smoke, ask for help to quit .

Remember, as a branch of the left main coronary artery, your `(Circumflex Artery)` can also be susceptible to `(Atherosclerosis)` and `(Coronary Artery Disease)`. If `(Plaque)` builds up in the `(Circumflex Artery)`, blood flow to the heart can be impaired. This is called `(Bifurcation Blockage)`. If this happens, `(Angioplasty)` and `(Stent)` may be needed to open the artery and improve blood flow.

Finally, what to remember! (Take-Home Message)

I hope you now have a good understanding of the `(Circumflex Artery)`. This is a very important blood vessel for the health of our heart. Therefore, it is very important to follow the lifestyle changes that we have discussed earlier to keep these arteries healthy. If you have symptoms like chest pain, difficulty breathing, do not ignore it and seek medical advice immediately.. Talk to your doctor about the best ways to protect your heart and arteries. A healthy heart means a healthy life!