Aortic Dissection

What is aortic dissection?

Aortic dissection is a serious medical emergency in which the inner layer of the aorta — the large blood vessel that carries blood from the heart to the rest of the body — tears. When this tear happens, blood pushes through the opening and forces the layers of the aortic wall apart. This creates a new, abnormal channel for blood, called a false lumen, alongside the normal channel. Because the aorta carries blood under high pressure, a dissection can spread quickly along the vessel, weaken the wall, and interfere with blood flow to vital organs such as the brain, heart, kidneys, and intestines.

To answer the common question “what is aortic dissection” in the simplest terms: it is a tear inside the wall of the body’s main artery. It is different from an aortic aneurysm, which is a bulging or ballooning of the aorta, although the two conditions are related and an aneurysm can increase the risk of dissection.

Doctors usually classify aortic dissection by where the tear begins. In the widely used Stanford system, a type A dissection involves the ascending aorta — the first portion of the aorta as it leaves the heart — and is generally treated as an immediate surgical emergency. A type B dissection begins farther along, in the descending aorta, and in many cases is first managed with medication and close monitoring rather than immediate surgery.

Aortic dissection is relatively uncommon, but it can affect anyone. It occurs most often in people between roughly 50 and 70 years of age, and it is more common in men than in women. People with long-standing high blood pressure, certain inherited connective tissue disorders, or a family history of aortic disease are at higher risk. Because the condition can become life-threatening within hours, rapid recognition and treatment are essential.

Symptoms of aortic dissection

Aortic dissection symptoms often begin suddenly and can be severe. The most characteristic symptom is intense chest or upper back pain that starts abruptly, often described by patients as tearing, ripping, or stabbing. However, symptoms vary depending on where the tear is located and which organs are affected, and in some people the pain is less dramatic or even absent, which can make diagnosis difficult.

Common aortic dissection symptoms include:

• Sudden, severe chest pain — often described as sharp, tearing, or ripping, and typically at its worst from the very start
• Sudden severe back pain, often between the shoulder blades, especially with dissections of the descending aorta
• Pain that moves or migrates as the tear extends along the aorta — for example, from the chest into the back, abdomen, or legs
• Shortness of breath
• Fainting or loss of consciousness (syncope)
• Weakness, numbness, or paralysis on one side of the body, or slurred speech — stroke-like symptoms that occur when blood flow to the brain is reduced
• A weak pulse or different blood pressure readings in each arm, which a clinician may detect
• Sweating, anxiety, and a sense of impending doom
• Abdominal pain, if the dissection affects arteries supplying the intestines or kidneys
• Leg pain or coldness, if blood flow to the legs is reduced

Symptoms can differ by type. A type A dissection, which involves the part of the aorta closest to the heart, more often causes front-of-chest pain and may lead to complications such as fluid around the heart, a leaking aortic valve, or reduced blood flow to the heart muscle itself. A type B dissection more often causes pain in the back or abdomen and may reduce blood flow to the kidneys, intestines, spinal cord, or legs.

Doctors also describe dissection by timing. An acute dissection is one diagnosed within the first two weeks of symptoms, when the risk of complications is highest. A chronic dissection is one that has been present for longer; symptoms at this stage may be milder or absent, but the weakened aortic wall still requires lifelong monitoring because it can enlarge over time.

Because the pain of aortic dissection can resemble a heart attack, and because some people have unusual or mild symptoms, the condition is sometimes missed at first. Anyone with sudden severe chest or back pain should seek emergency care immediately rather than waiting to see whether the pain improves.

Causes and risk factors

Aortic dissection causes generally involve two elements: a weakened aortic wall and stress on that wall, most often from high blood pressure. Over time, these forces can allow the inner layer of the vessel to tear.

The most important risk factors include:

• High blood pressure (hypertension) — the single most common risk factor, present in a large proportion of people who develop a dissection. Long-standing, poorly controlled hypertension gradually stresses and weakens the aortic wall.
• Pre-existing aortic aneurysm — a bulging, weakened section of the aorta is more prone to tearing.
• Atherosclerosis — hardening and narrowing of the arteries caused by fatty deposits, which can damage the vessel wall.
• Inherited connective tissue disorders — conditions such as Marfan syndrome, Loeys-Dietz syndrome, and vascular Ehlers-Danlos syndrome affect the proteins that give blood vessel walls their strength and elasticity, raising the risk of dissection at a younger age.
• Bicuspid aortic valve — a congenital condition (present from birth) in which the aortic valve has two flaps instead of the usual three; it is associated with weakening of the nearby aorta.
• Family history — having a close relative who had an aortic aneurysm or dissection increases risk, even without a named genetic syndrome.
• Age and sex — risk rises with age, and men are affected more often than women.
• Smoking — tobacco use damages blood vessels and raises blood pressure.
• Cocaine and other stimulant use — these drugs can cause sudden, severe spikes in blood pressure.
• Pregnancy — a rare cause, but the hormonal and circulatory changes of pregnancy can increase risk, particularly in women with connective tissue disorders.
• Chest trauma — for example, from a high-speed car accident.
• Intense straining or extreme exertion — in susceptible people, activities that sharply raise blood pressure, such as very heavy weightlifting, have been linked to dissection.
• Inflammatory conditions — certain diseases that inflame the blood vessels, such as giant cell arteritis, can weaken the aortic wall.

In many cases several factors act together — for example, an older adult with years of untreated hypertension and atherosclerosis. In younger patients, an inherited condition or congenital heart abnormality is more often the underlying cause. Because some risk factors run in families, doctors may recommend that first-degree relatives of a person who had a dissection undergo screening of their own aorta.

Diagnosis of aortic dissection

Aortic dissection diagnosis begins with a careful assessment of the patient’s symptoms, medical history, and physical examination. A doctor may check the pulse and blood pressure in both arms, since a significant difference between the two sides can suggest a dissection. Listening to the heart may reveal a new murmur if the aortic valve is affected. However, no physical finding can confirm or rule out a dissection on its own, so imaging tests are essential.

Tests commonly used to confirm the diagnosis include:

• Computed tomography angiography (CTA) — a CT scan performed with contrast dye injected into a vein. This is the most commonly used test in the emergency setting because it is fast, widely available, and shows the tear, the extent of the dissection, and the branch vessels involved in detail.
• Transesophageal echocardiography (TEE) — an ultrasound probe passed gently down the esophagus (the food pipe), which sits directly behind the heart. It provides close-up images of the ascending aorta and aortic valve and can be performed at the bedside for unstable patients.
• Magnetic resonance imaging (MRI/MRA) — highly detailed imaging that avoids radiation, often used for follow-up of chronic dissections or when CT is not suitable; it takes longer, so it is used less often in emergencies.
• Chest X-ray — may show a widened aorta or other indirect signs, but a normal X-ray does not rule out a dissection.
• Electrocardiogram (ECG) — a recording of the heart’s electrical activity, mainly used to help distinguish a dissection from a heart attack, although the two can occur together.
• Blood tests — including a test called D-dimer, which measures a substance released when blood clots break down. A normal result in a low-risk patient can make dissection less likely, but blood tests alone cannot confirm the diagnosis.

Once a dissection is confirmed, imaging is also used to classify it as type A or type B and to identify complications, such as reduced blood flow to organs or fluid around the heart. This classification directly determines treatment, which is why accurate and rapid imaging is so important. In hospitals with dedicated cardiovascular services, such as the cardiovascular surgery and cardiology departments at Acibadem, this evaluation is typically carried out urgently by a team that includes emergency physicians, radiologists, cardiologists, and cardiac or vascular surgeons.

Treatment options for aortic dissection

Aortic dissection treatment depends primarily on the type of dissection, the patient’s condition, and whether complications are present. All patients require emergency hospital care, usually in an intensive care unit at first, along with medication to reduce stress on the aortic wall.

Emergency medication

The first step in nearly every case is to lower the blood pressure and slow the heart rate with intravenous medicines, most often beta-blockers (drugs that slow the heart and reduce the force of each beat). Additional blood pressure medicines may be added as needed. The goal is to reduce the force of blood pushing against the torn wall, which helps limit the spread of the dissection. Pain control is also an important part of early care, because pain itself raises blood pressure.

Surgery for type A dissection

A dissection involving the ascending aorta (type A) is generally treated with emergency open-heart surgery. Without prompt repair, this type of dissection carries a very high risk of fatal complications, such as rupture of the aorta or bleeding around the heart. During surgery, the surgeon removes the torn section of the aorta and replaces it with a synthetic tube called a graft. If the aortic valve has been damaged, it may be repaired or replaced during the same operation. This is major surgery, and recovery typically involves time in intensive care followed by weeks to months of gradual rehabilitation.

Management of type B dissection

A dissection limited to the descending aorta (type B) that is not causing complications is often managed initially with medication and very close monitoring — sometimes called medical management rather than watchful waiting, because it involves intensive treatment of blood pressure and repeated imaging. Many patients with uncomplicated type B dissections do not need an immediate procedure.

If a type B dissection causes complications — such as reduced blood flow to organs or limbs, ongoing pain, uncontrollable blood pressure, or rapid enlargement of the aorta — a procedure is usually needed. In many cases this is thoracic endovascular aortic repair (TEVAR), a minimally invasive procedure in which a fabric-covered metal tube called a stent graft is guided through an artery in the groin and placed inside the aorta to cover the tear and redirect blood flow into the true channel. Open surgery on the descending aorta is another option in selected cases when endovascular repair is not suitable.

Long-term treatment

After the initial event, treatment continues for life. This typically includes:

• Blood pressure medication, most often including a beta-blocker, taken consistently to keep pressure within the target your doctor sets
• Regular imaging surveillance — scheduled CT or MRI scans, at intervals your care team determines, to watch for enlargement of the aorta or changes in the dissection
• Lifestyle measures — stopping smoking, avoiding very heavy lifting and intense straining, and managing cholesterol and other cardiovascular risk factors
• Further procedures if needed — some patients eventually require additional repair if the aorta enlarges over time

Your care team will tailor the plan to your situation; there is no single approach that fits every patient.

Living with aortic dissection and outlook

Aortic dissection is a life-threatening condition, and honesty about that is important: the risk is highest in the first hours and days, which is why immediate emergency care matters so much. With prompt diagnosis and appropriate treatment, however, many people survive and go on to live full, active lives.

The outlook depends on several factors, including the type of dissection, how quickly treatment began, the patient’s age and overall health, and whether organs were affected before treatment. After surviving the acute phase, the dissected aorta remains permanently changed, and part of the wall may stay weakened. For this reason, lifelong follow-up is standard — not optional — and includes regular imaging and strict blood pressure control.

Day to day, most survivors can return to work, travel, and moderate exercise, though the timeline varies and should be guided by the care team. Doctors often advise avoiding activities that cause sudden spikes in blood pressure, such as maximal weightlifting or straining, while encouraging regular moderate activity such as walking. Emotional recovery matters as well: surviving a sudden, life-threatening event can lead to anxiety or low mood, and support from mental health professionals, cardiac rehabilitation programs, or patient support groups can help.

Because some causes of dissection are inherited, doctors may also recommend that close family members have their aortas checked with imaging, and genetic counseling may be offered when a connective tissue disorder is suspected.

Frequently asked questions

What is aortic dissection in simple terms?

Aortic dissection is a tear in the inner lining of the aorta, the body’s largest artery. Blood enters the tear and splits the layers of the artery wall apart, creating a false channel. This weakens the aorta and can block blood flow to vital organs, which is why it is treated as a medical emergency.

How serious is an aortic dissection?

It is one of the most serious cardiovascular emergencies. Untreated, it can be fatal within hours, particularly when the tear involves the part of the aorta nearest the heart. With rapid diagnosis and treatment, survival improves considerably, and many patients recover well, although lifelong monitoring is needed afterward.

What does aortic dissection pain feel like?

Patients most often describe a sudden, severe, tearing or ripping pain in the chest or between the shoulder blades that is at its worst from the very beginning. The pain may move as the tear extends. However, not everyone has classic pain — some people have milder discomfort, abdominal pain, fainting, or stroke-like symptoms, so any sudden severe pain warrants emergency evaluation.

Can an aortic dissection heal on its own?

No. A dissection does not repair itself, and it always requires medical treatment. In some cases — typically uncomplicated type B dissections — treatment consists of medication and close monitoring rather than surgery, and the aortic wall may stabilize over time. Even then, the aorta remains permanently changed and must be followed with regular imaging for life.

What is the difference between an aortic dissection and an aortic aneurysm?

An aneurysm is a bulging, enlarged section of the aorta caused by a weakened wall, while a dissection is a tear within the wall itself. The two are related: an aneurysm increases the risk of a dissection, and a chronic dissection can cause the aorta to enlarge like an aneurysm over time. Both conditions require specialist follow-up.

What is the recovery like after aortic dissection treatment?

Recovery varies with the type of treatment. After open surgery, patients usually spend time in intensive care followed by weeks to months of gradual recovery, often with cardiac rehabilitation. After endovascular stent-graft repair, hospital stays are often shorter and recovery faster. In all cases, long-term recovery includes strict blood pressure control, regular imaging, and adjustments to strenuous activity as advised by the care team.

Can aortic dissection be prevented?

Not always, especially when inherited conditions are involved, but risk can often be reduced. The most important steps are keeping blood pressure well controlled, not smoking, avoiding stimulant drugs such as cocaine, and attending regular check-ups. People with a known aneurysm, a bicuspid aortic valve, a connective tissue disorder, or a family history of aortic disease may benefit from planned imaging surveillance so problems can be treated before a tear occurs.

When to see a doctor

Aortic dissection is an emergency. Do not wait to see whether symptoms pass. Call your local emergency number or go to the nearest emergency department immediately if you or someone near you experiences:

• Sudden, severe chest pain, especially pain described as tearing, ripping, or stabbing
• Sudden severe pain in the back, particularly between the shoulder blades, or severe abdominal pain that starts abruptly
• Pain that moves from the chest to the back, abdomen, or legs
• Fainting or loss of consciousness
• Sudden difficulty breathing
• Stroke-like symptoms — sudden weakness or numbness on one side of the body, difficulty speaking, or vision changes
• A sudden cold, pale, or painful leg or arm

If you have already been diagnosed with an aortic dissection, an aneurysm, or a condition that weakens the aorta, contact your medical team promptly about any new or worsening chest, back, or abdominal pain, difficulty keeping blood pressure controlled, or missed follow-up imaging. People with risk factors — such as long-standing high blood pressure, a bicuspid aortic valve, Marfan syndrome or a related connective tissue disorder, or a family history of aortic disease — should discuss screening and prevention with a doctor even when they feel well. Conditions of the aorta are typically managed by specialists in cardiology and cardiovascular surgery; at Acibadem, for example, these departments coordinate both emergency care and long-term surveillance for patients with aortic disease.