Need for secondary interventions after endovascular repair of abdominal aortic aneurysms. Intermediate-term follow-up results of a European collaborative registry (EUROSTAR)

Background: The frequency of secondary interventions after endovascular repair of abdominal aortic aneurysms (AAAs) was assessed and correlated with findings at clinical and imaging examination during follow-up.Methods: Data were studied from 1023 patients with a follow-up of 12 months or longer, collected by 56 institutions in a multicentre data registry (EUROSTAR). Surveillance data were provided by the centres between September 1996 and November 1999.Results: Overall, 186 patients (18 per cent) had a secondary intervention occurring a mean of 14 months after the initial endograft procedure. Twelve per cent of the interventions were transabdominal, 11 per cent consisted of an extra-anatomic bypass and 76 per cent involved a transfemoral procedure. The rates of freedom from intervention at 1, 3 and 4 years were 89, 67 and 62 per cent respectively. Migration (relative risk (RR) 8.9) and rupture (RR 22.6) were the most frequent causes of secondary transabdominal interventions. Graft limb thrombosis was the principal indication for extra-anatomic bypass (RR 37.5 for clinical evidence of graft limb thrombosis). Endoleak, graft kinking, stenosis or thrombosis and device migration were significant causes for secondary transfemoral interventions (RR 2.5-6.9).Conclusion: The high incidence of late secondary interventions is a cause for concern with regard to broad application of endovascular AAA repair, and emphasizes the need for lifelong surveillance.