VWF and abdominal aortic aneurysm: By conducting this prospective study, we aim to investigate the effects of complex EVAR of para-renal and TAAA on blood coagulation with regard to vWF, factors VIII and XI, D-dimers, fibrinogen, and Adamts-13 and platelet activation (multiplate) in patients undergoing complex para-renal and thoraco-abdominal aortic aneurysm repair.