Aneurysm: Types, Symptoms, Diagnosis, and Treatment

An aneurysm occurs when a weakened section of a blood vessel wall bulges, causing an abnormal widening or ballooning that exceeds 50% of its normal diameter. Aneurysms may occur in any blood vessel throughout the body, and they are more commonly found in arteries than in veins. The aorta, the body’s largest artery responsible for transporting oxygen-rich blood from the heart, is the most common site for aneurysms. The aorta has two main sections: the thoracic aorta, located in the chest cavity, and the abdominal aorta, which extends through the abdomen.

Types of Aneurysm

Aneurysms are classified based on their location, shape, and underlying cause.

• Abdominal Aortic Aneurysm (AAA): This type of aneurysm develops in the section of the aorta that supplies blood to the abdomen. It is considered the most dangerous type of aneurysm due to its potential for life-threatening internal bleeding and high mortality rate.
• Cerebral Aneurysm: It is also known as a brain aneurysm, which occurs in an artery within the brain. The most common form, a saccular (or berry) aneurysm, appears as a sac-like bulge attached to an artery, resembling a small berry.
• Thoracic Aortic Aneurysm: Less common than AAAs, these aneurysms form in the upper portion of the aorta within the chest.
• Carotid Aneurysm: These rare aneurysms develop in the carotid arteries that carry blood to the brain, neck, and face.
• Popliteal Aneurysm: This type affects the artery behind the knee.
• Mesenteric Artery Aneurysm: This aneurysm forms in the artery that supplies blood to the intestines.
• Splenic Artery Aneurysm: These aneurysms occur in an artery that supplies blood to the spleen.

Causes

An aneurysm develops when an artery wall becomes weak and starts to bulge. Blood pressure pushes against the weak area and makes it bulge. In many cases, the exact cause is not known, but several factors can increase the risk.

• Atherosclerosis: Fat and plaque build up in the arteries. This makes them hard and weak.
• High blood pressure: Constant pressure damages the artery walls.
• Family history: Aneurysms can run in families. Some inherited conditions like Fibromuscular Dysplasia and Polycystic Kidney Disease may increase risk.
• Congenital weakness: Some people are born with weak artery walls.
• Injury or infection: Trauma or deep infections can damage arteries.
• Smoking and high cholesterol: These damage blood vessels and increase plaque buildup.
• Age and gender: Risk increases with age, and men are more likely to develop certain types.

In simple words, anything that weakens artery walls or raises blood pressure can cause an aneurysm.

Symptoms

Aneurysms often develop without symptoms and may rupture suddenly or grow rapidly. The following symptoms may be present, depending on where the aneurysm is:

• Headache
• Ache in the back or abdomen
• An Abdominal lump that pulses
• Lower limbs with blue colouring (cyanosis)
• Lightheadedness
• Confusion
• Fatigue
• Wheezing
• Difficulty swallowing
• Elevated respiratory rate
• Swelling in the neck
• Pain in the upper back or chest
• Vomiting and nausea

Risk Factors

Any ailment that weakens the walls of your arteries can lead to the development of an aneurysm. Multiple circumstances that lead to the disintegration of the well-organised structural elements (proteins) of the aortic wall, which support and stabilise the wall, can result in an aneurysm.

Some of the risk factors that can contribute to this condition are as follows:

• Advanced age
• Gender
• Family background
• Genetic components
• High fats and cholesterol in the blood
• High blood pressure
• Excess weight
• Infections and deep wounds
• Sexually transmitted diseases

Areas Where Aneurysms Develop

Aneurysms can occur in numerous body parts, including the:

• Aorta (the body’s main artery)
• Abdominal aorta
• Thoracic aorta
• Arteries that transport blood to the brain can develop brain aneurysms.
• Peripheral aneurysms can occur in blood vessels located in areas like the legs, groin, or neck.

Complications

Aneurysms can have serious consequences if left untreated. Depending on the location of the aneurysm, some potential issues include:

• Blood seeping out of the intact aneurysm into the artery walls (known as a dissecting aneurysm)
• Blood clots forming within the aneurysm and compressing surrounding nerves, subarachnoid haemorrhage (reduced blood flow in the layers of tissue surrounding the brain after the aneurysm ruptures)
• Stroke
• Epilepsy-induced paralysis
• Heart failure with congestion
• Cardiac arrest
• Renal failure
• Unexpected death

Diagnosis

Aneurysms can be diagnosed through various tests such as physical examinations, X-rays, ultrasonography scans, CT angiograms, MR angiograms, digital angiograms, and Cerebrospinal fluid examination.

Prevention Tips

It is important to maintain a healthy lifestyle to reduce the risk of developing an aneurysm. This includes managing hypertension, consuming nutritious food, participating in regular exercise, quitting tobacco use, and limiting alcohol consumption.

Treatment

If doctors detect an unruptured aneurysm, they closely monitor it to prevent its rupture. Treatment depends on the aneurysm’s size, location, and type and may involve medication or surgery. Medications can help regulate blood pressure, improve blood flow, and keep cholesterol levels normal. These treatments slow aneurysm growth and reduce pressure on the artery walls. Nonetheless, larger aneurysms or those at risk of rupture may require surgical intervention.

Surgical treatment options include:

• Endovascular aneurysm repair (EVAR): Surgeons insert a catheter (tube) into the affected blood vessel and guide a graft (specialised tubing) to reinforce or repair the artery. For thoracic aneurysms, this procedure is called thoracic endovascular aneurysm repair (TEVAR). If the graft requires custom openings, the procedure is known as fenestrated endovascular aneurysm repair (FEVAR).
• Open surgery: Surgeons may remove the aneurysm or place a graft through an incision.
• Endovascular coiling: This procedure is used for cerebral aneurysms. It involves inserting multiple platinum wire coils through a catheter to pack the aneurysm, reducing blood flow and preventing rupture.
• Microvascular clipping: A surgeon places a metal clip at the base of a cerebral aneurysm during open brain surgery to cut off the blood supply and prevent rupture.
• Catheter embolisation: This method blocks blood flow to the aneurysm by inserting a catheter into the artery and delivering embolic agents or medication to stop bleeding.

By selecting the most suitable treatment, healthcare providers seek to avoid complications and enhance patient outcomes.

Frequently Asked Questions