Abdominal Aortic Aneurysm – Causes, Symptoms & Treatment
An abdominal aortic aneurysm is an abnormal enlargement of the main abdominal artery. It often causes no symptoms but can be life-threatening if it ruptures.
Things worth knowing about "Abdominal Aortic Aneurysm"
An abdominal aortic aneurysm is an abnormal enlargement of the main abdominal artery. It often causes no symptoms but can be life-threatening if it ruptures.
What Is an Abdominal Aortic Aneurysm?
An abdominal aortic aneurysm (AAA) is an abnormal, balloon-like bulging of the abdominal aorta – the largest artery in the human body running through the abdomen. An aneurysm is diagnosed when the diameter of the aorta exceeds 3 cm (about 1.2 inches), which represents an enlargement of more than 50 percent compared to the normal vessel size. A ruptured abdominal aortic aneurysm is a life-threatening emergency with a very high mortality rate if not treated immediately.
Causes and Risk Factors
Most abdominal aortic aneurysms develop due to degenerative weakening of the arterial wall. The main risk factors include:
- Atherosclerosis (hardening of the arteries): The most common underlying cause, involving plaque buildup that weakens the vessel wall.
- Smoking: The most significant preventable risk factor.
- High blood pressure (hypertension): Increased pressure against the artery wall promotes expansion.
- Older age: Risk increases significantly after the age of 65.
- Male sex: Men are approximately 4 to 6 times more likely to develop AAA than women.
- Family history: A genetic predisposition is well established.
- Chronic inflammation or rare connective tissue disorders such as Marfan syndrome.
Symptoms
Most abdominal aortic aneurysms are silent for a long time and are often discovered incidentally during an ultrasound for another reason. When symptoms do occur, they may include:
- A dull, persistent pain in the abdomen or lower back
- A pulsating sensation in the abdomen
- Pain radiating into the groin, back, or legs
A rupture or impending rupture causes sudden, severe, tearing pain in the abdomen and back, accompanied by dizziness, a drop in blood pressure, and possible loss of consciousness. This is a medical emergency requiring immediate surgery.
Diagnosis
AAA is diagnosed using imaging techniques:
- Ultrasound (sonography): A fast, safe, and cost-effective first-line imaging method; also used for population screening.
- Computed tomography (CT) scan with contrast dye: Provides detailed information on size, shape, and anatomy – essential before surgery.
- Magnetic resonance imaging (MRI): An alternative to CT, particularly useful for patients with contrast dye intolerance.
In many countries, including the United States and the United Kingdom, a one-time ultrasound screening for AAA is recommended for men aged 65 and older, and for women with significant risk factors.
Treatment
Conservative Management (Watchful Waiting)
Small aneurysms under 5 cm in diameter are typically monitored with regular ultrasound scans every 6 to 12 months. At the same time, risk factors are actively managed: blood pressure control, smoking cessation, cholesterol reduction, and regular physical activity.
Surgical Treatment
Surgery is recommended when the aneurysm reaches 5 cm or more in diameter, grows rapidly, or causes symptoms. Two main approaches are available:
- Open surgical repair: The surgeon replaces the weakened section of the aorta with an artificial graft (prosthesis). This is a major operation but offers long-term durability.
- Endovascular aneurysm repair (EVAR): A stent-graft is inserted through the groin arteries using minimally invasive techniques to seal off the aneurysm from the inside. This approach involves a faster recovery but requires ongoing follow-up imaging.
Prognosis
When detected early and managed appropriately, the prognosis for patients with AAA is generally favorable. However, the mortality rate of a ruptured aortic aneurysm exceeds 80 percent. Regular screening and follow-up examinations are therefore critical, especially for high-risk individuals.
References
- Wanhainen A. et al. – European Society for Vascular Surgery (ESVS) 2019 Clinical Practice Guidelines on the Management of Abdominal Aorto-iliac Artery Aneurysms. European Journal of Vascular and Endovascular Surgery, 2019.
- U.S. Preventive Services Task Force – Abdominal Aortic Aneurysm: Screening. JAMA, 2019. Available at: www.uspreventiveservicestaskforce.org
- Lederle F. A. – The natural history of abdominal aortic aneurysm. Acta Chirurgica Belgica, 2009.
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