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Objective Concentrations of D-dimer, a degradation product of cross-linked fibrin, were found to be raised in patients with AAD by several studies.Admission concentrations of D-dimer have emerged as a complementary diagnostic marker for acute aortic dissecting (AAD).But its prognostic role with in-hospital mortality in patients with Stanford type AAAD was not well elucidated.To clearly elucidate the prognostic role of D-dimer with in-hospital mortality in patients with Stanford type AAAD, we conducted the present study enrolling relatively larger patients with AAD in a single center with abundant source of patients in China.