Studies that assign aneurysm patients to treatment with EVAR or traditional open surgery have demonstrated fewer early complications with the minimally-invasive approach. Some studies have also observed a lower mortality rate with EVAR. The reduction in death, however, does not persist long-term. After a few years the survival after repair is similar with EVAR or open surgery. This observation may be the result of durability problems with early endografts, with a corresponding need for additional procedures to repair endoleaks and other device-related issues. Newer, improved technology may reduce the need for such secondary procedures. If so, the results of EVAR may improve to the point where long-term survival benefit becomes evident.