Objective: To report long-term results of standard EVAR focusing on endoleak onset (ELo) and its evolution.
Methods: 880 EVARs using different stentgrafts (1999-2015) were included. Primary outcomes were all-cause mortality and AAA-related mortality. Timing of ELo after EVAR was categorized as follows: ELo1 = 0-2 years, ELo2 = 2-4 years, ELo3 = 4-6 years, ELo4 = 6-8 years, and ELo5 ≥ 8 years. The rate of sac shrinkage/sac expansion and the need to re-intervene were the variables considered to determine EL evolution.
Results: Median follow-up was 60 months (IQR: 36-84). Summary follow-up index was 0.99. Survival rate was 94.5% at 2 years, 57.7% at 10 years, 33.3% at 14 years. Freedom from AAA-related-death rate was 99.3% at 14 years. Freedom from endoleak was 86.4% at 2 years, 68.3% at 10 years, and 48.6% at 14 years. EL rate was 1.9% (n = 19),16.6% (n = 146), 0.8% (n = 7), and 0.4% (n = 4) for type I, II, III and IV, respectively. Only type II EL showed a significant difference in the ELo (Elo1 = 31%; ELo2 = 12.8%; ELo3 = 9.4%; Elo4 = 10.2%; Elo5 = 11.4%; P < .001). Sac shrinkage occurred in 791 (90%) patients while 89 (10%) had a persistent sac expansion at the last follow-up. Freedom from reintervention was 95.6% at 2 years, 86.4% at 10 years, and 80% at 14 years. 48 out of 176 (27.2%) patients with EL underwent reintervention. The re-intervention rate was significantly higher within the first two years of follow-up if compared to the following years (17.6% vs. <10%; P < .001).
Conclusions: An active lifelong surveillance follow-up can guarantee good long-term EVAR outcomes. Reinterventions and type II EL were more frequent in the first two-year of follow-up.
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