Management of Infrarenal Abdominal Aortic Aneurysms

Introduction to Surveillance and Intervention

The European Society of Cardiology recommends surveillance with duplex ultrasound every 12 months for infrarenal AAAs measuring less than 5.0 cm in men or less than 4.5 cm in women, along with aggressive cardiovascular risk factor modification, as surgical intervention is not indicated at this size 1, 2
Elective repair is only recommended when AAA diameter reaches ≥55 mm in men or ≥50 mm in women, according to the European Heart Journal 1

Duplex ultrasound is the recommended imaging modality for monitoring AAAs, as stated by the European Society of Cardiology 1, 2
For AAAs measuring 3.0-3.9 cm, perform DUS surveillance every 3 years, but for those approaching 4.0 cm, annual surveillance is more appropriate and aligns with the 2024 ESC recommendation for AAAs in the 4.0-5.0 cm range 1, 2, 6

Optimal cardiovascular risk management is mandatory to reduce major adverse cardiovascular events and potentially slow aneurysm expansion, as recommended by the European Society of Cardiology 1, 2
Smoking is the strongest modifiable risk factor for AAA development and expansion, and immediate cessation is essential, according to the Journal of the American College of Cardiology 3, 7
Perioperative beta-blockers reduce cardiac events in patients with coronary disease undergoing AAA repair and may reduce aneurysm expansion rate during surveillance, as stated by the Journal of the American College of Cardiology 3, 7

Monitor for high-risk features that would prompt consideration of earlier repair regardless of absolute diameter, including rapid expansion, symptoms, and growth rate, as recommended by the European Society of Cardiology and the Journal of the American College of Radiology 1, 2, 3, 6, 8
Rapid expansion is defined as ≥10 mm per year or ≥5 mm in 6 months, and any symptoms such as abdominal pain, back pain, or tenderness require immediate attention 2, 3, 6, 8

Screen first-degree relatives, especially male siblings ≥60 years old, with ultrasound, as AAA has a genetic component, according to the Journal of the American College of Cardiology and the European Society of Cardiology 2, 3, 7

Do not delay scheduled surveillance imaging, as AAAs expand unpredictably and rupture carries 75-90% mortality, as stated by the Praxis Medical Insights 7
Do not rely on physical examination alone, as AAAs are typically asymptomatic until rupture and physical exam has limited sensitivity for detecting size changes, according to the Praxis Medical Insights 2
Do not perform premature intervention, as operative risks exceed rupture risk at smaller diameters, as recommended by the European Heart Journal and the Journal of the American College of Cardiology 1, 3