Preoperative variables predict persistent type 2 endoleak after endovascular aneurysm repair

Area of Science:

• Vascular Surgery
• Endovascular Repair
• Aortic Aneurysm Management

Background:

• Persistent type 2 endoleaks (PT2) following endovascular aneurysm repair (EVAR) are associated with adverse outcomes.
• Defining preoperative risk factors for PT2 is crucial for patient stratification and management.

Purpose of the Study:

• To evaluate preoperative risk factors associated with PT2 after EVAR.
• To assess the natural history of PT2 and identify a high-risk patient population.

Main Methods:

• Analysis of 595 EVAR patients with long-term CT follow-up (1999-2007).
• Cox regression used to correlate preoperative variables with PT2.
• Kaplan-Meier analysis for spontaneous resolution, sac enlargement, and reintervention rates.

Main Results:

• 23% of patients developed PT2; risk factors included patent inferior mesenteric artery, increased lumbar arteries, older age, and larger luminal diameter.
• Spontaneous PT2 resolution occurred in 35% at 5 years; 54.6% had no sac enlargement >5mm.
• Freedom from reintervention was 67.3% at 5 years; combinations of risk factors significantly increased PT2 odds.

Conclusions:

• Identifiable preoperative variables predict PT2 after EVAR.
• The natural history of PT2 is not always benign, with only 35% resolving spontaneously.
• Consideration of perioperative interventions is warranted for patients with composite high-risk factors.