Aortic Dissection

Sometimes called a dissecting aortic aneurysm

A medical emergency in which a tear opens in the inner layer of the aorta — the body's main artery, carrying blood out of the heart. Blood rushes into the tear and drives the layers of the artery wall apart, splitting them along their length. If the blood breaks through the outer wall, aortic dissection is often fatal. Symptoms resemble those of other conditions, which frequently delays diagnosis — and delay is the thing that kills.

If This Is Happening Now — Call 911

Aortic dissection is a time-critical emergency. Do not wait to see if it passes. Do not drive yourself. Call emergency services and say the words "I have sudden severe tearing chest or back pain" — the description matters, because it changes what clinicians look for.

Sudden, severe chest or upper back pain — classically described as tearing or ripping, and often at maximum intensity from the very first moment.
Sudden severe abdominal pain.
Fainting or loss of consciousness.
Shortness of breath.
Stroke-like symptoms — sudden vision changes, trouble speaking, weakness or loss of movement on one side of the body.
Leg pain or difficulty walking.

The Anatomy — in Plain Terms

The aorta is a hose with layered walls, and it carries every drop of blood the heart pumps to the body. In a dissection, the innermost layer tears. Blood — under the full pressure of the heart — forces its way into that tear and begins peeling the layers apart, carving a false channel inside the wall of the artery itself. That false channel can steal blood from the true one, starving whatever the aorta was feeding: the brain, the kidneys, the intestines, the legs. Or the outer wall can give way, and the bleeding is catastrophic.

Dissections are grouped by where the tear is. Type A involves the ascending aorta, where it leaves the heart — the more common and more dangerous type, and usually a surgical emergency. Type B involves only the descending aorta, and is more often managed with aggressive blood-pressure control, though it can still be lethal. Both can extend down into the abdomen.

Source

Definition, symptoms, and risk factors adapted from "Aortic dissection," Mayo Clinic — a patient-facing clinical reference. This page is educational and is not medical advice.

Key Points

It is uncommon — and that is part of the danger. It occurs most often in men in their 60s and 70s, and because it is rare while its symptoms are ordinary, it is frequently mistaken for something else. Early diagnosis and fast treatment dramatically improve survival.
The pain has a signature. Sudden, severe, maximal at onset, and often described as tearing or ripping — frequently migrating from the chest to the back as the tear travels.
The biggest risk factor is high blood pressure. Others include atherosclerosis, an existing aortic aneurysm, a bicuspid aortic valve, and aortic coarctation.
Some risk is inherited. Marfan syndrome, Ehlers-Danlos syndrome, Loeys-Dietz syndrome, Turner syndrome, and giant cell arteritis all raise the risk — which is why a family history of aortic aneurysm or dissection is a fact worth knowing and telling every doctor you meet.
Other risk factors include male sex, age 60 and older, cocaine use, pregnancy (rarely), and intense resistance training — anything that spikes the pressure inside the pipe.
The complications are what the emergency is racing. Fatal internal bleeding, stroke, kidney failure, life-threatening bowel injury, aortic regurgitation (blood leaking backward through the valve), and cardiac tamponade (blood filling the sac around the heart until it cannot beat).

Why This Term Is in This Glossary

Because of one line in the Mayo Clinic description: "Symptoms of aortic dissection may seem like those of other health conditions. This often leads to delays in diagnosis."

That sentence is the thesis of this entire site, written in cardiology. A condition where survival is measured against the clock, whose symptoms wear the costume of something more ordinary, arriving in a system where the ordinary path is a delay — a wait for authorization, a wait for a scan to be approved, a wait for someone with the right specialty to look at the right image. Every structure that slows medicine down is aimed, whether it means to be or not, at the patient whose artery is tearing open right now.

The lesson for anyone reading this is not political. It is practical: know the words. Sudden. Severe. Tearing. Chest to back. Say them out loud to the person taking your history — because the difference between a dissection caught and a dissection missed is very often nothing more than whether the right words were spoken early enough to point at the right picture.