Objective To explore the early diagnosis significance and prognosis impact of D-dimer for acute aortic dissection( AAD). Methods 60 cases from October 2011 to February 2014 in the department of cardiovascular surgery of the Second Affiliated Hospital of Zhengzhou University were diagnosed as AAD through direct digital angiography( DSA),magnetic resonance angiography( MRA),CT angiography( CTA) or transesophageal echocardiography( TEE).48 hospitalized patients at the same time interval who were diagnosed with...