Abdominal Aortic Aneurysm Management

Introduction

Abdominal aortic aneurysm (AAA) management involves surveillance, monitoring, and intervention to prevent rupture and reduce mortality, as recommended by the American College of Cardiology and the American Heart Association 1, 2

For AAAs with a diameter of 3.8cm, surveillance with duplex ultrasound every 12 months is recommended, as stated by the American College of Cardiology 1
Duplex ultrasound is the preferred imaging modality for AAA surveillance due to its non-invasive nature, absence of radiation exposure, cost-effectiveness, and high sensitivity and specificity, according to the American College of Radiology 3

The surveillance interval may be adjusted based on AAA size, with the following recommended intervals:

AAA Size	Surveillance Interval
25-29 mm	every 4 years [4]
30-39 mm	every 3 years [4, 2]
40-49 mm	annually [4, 2]
50-55 mm (men), 45-50 mm (women)	every 6 months [4, 2]
≥55 mm (men), ≥50 mm (women)	consider intervention rather than continued surveillance [4, 3]

Patients who do not comply with surveillance programs have significantly higher rupture rates than those who do, as noted by the American Heart Association 5

Intervention, such as open surgical repair or endovascular aortic repair (EVAR), is generally indicated when AAA diameter reaches ≥5.5cm in men or ≥5.0cm in women, as recommended by the American Heart Association 2
Intervention is also indicated when the growth rate is ≥0.5cm in one year or ≥0.3cm/year for two consecutive years, according to the American Heart Association 2
Development of symptoms attributable to the aneurysm, regardless of size, is also an indication for intervention, as stated by the American Heart Association 2
Saccular aneurysms may require repair at ≥45 mm due to increased rupture risk, and urgent intervention is required regardless of size if symptoms are present, such as back, abdominal, or flank pain 6, 2

Smoking cessation, blood pressure control (target SBP 120-129 mmHg if tolerated), and lipid management (LDL-C goal <1.4 mmol/L or 55 mg/dL) are crucial in preparing for intervention, as recommended by the American College of Cardiology and the European Society of Cardiology 4, 6
Perioperative beta-blockade is recommended for patients with coronary artery disease undergoing AAA repair to reduce adverse cardiac events, as suggested by the American College of Cardiology and the European Heart Society 7, 4

EVAR is preferred over open repair for patients with suitable anatomy and low cardiac index, as it reduces perioperative mortality to <1%, according to the European Heart Journal and the American College of Cardiology 7, 4
Open repair may be considered for patients with unsuitable anatomy for EVAR, if life expectancy is >2 years and cardiac function can be optimized, while conservative management may be appropriate for those with life expectancy <2 years, as suggested by the European Heart Journal 4

Lifelong surveillance is mandatory after EVAR, with first follow-up imaging within 1 month post-EVAR, subsequent imaging at 12 months, and then annually if stable, as recommended by the European Society of Cardiology 4
Follow-up imaging with CT/CTA (or CMR) and DUS at 1 month and 12 months post-operatively is recommended by the European Society of Cardiology, and if no abnormalities are documented, DUS annually with CT/CTA or CMR every 5 years is recommended 4

Symptomatic AAAs require urgent intervention regardless of size, according to the American College of Cardiology, and mortality for symptomatic but intact AAAs remains high (19%) even without rupture, as reported by the American College of Cardiology 7, 8
Continue cardiac optimization medications long-term, and avoid routine coronary angiography and systematic revascularization before AAA repair in patients with chronic coronary syndromes, as suggested by the European Heart Journal 4