This is a round table discussion about CO2 during EVAR and complex EVAR in the framework of the annual meeting of Angiodroid in Bologna, Italy. In this round table discussion, 5 European experts present current evidence and their experience about the use of CO2 in the treatment of aortic diseases (s. chapters). Moreover, the panellists discuss all important benefits and drawbacks of the technique and present for the first time the study protocol of the prospective CO2 EVAR registry.