Objective: Although acute aort dissection (AAD) is quite difficult to be diagnosed in the emergency department, the mortality of it is very high. Therefore, the purpose of our study is to discuss the evidence of demographic characteristics, clinical, laboratory of the AAD patients who applied to emergency department over mortality. MaterialsandMethods: In our research including 73 patients with AAD diagnosed whom admitted to emergency department on January 2010-October 2015. Sex, age, presenting complaints, past medical history, arterial blood pressure, pulse, laboratory tests, transthoracic echocardiography (TTE), thoracoabdominal computerized tomography (CT), mortality and DeBakey type have been recorded on patient information form. Statistical analysis was performed in IBM SPSS Statistics Version 22.0 software package. The comparison between the two groups of data Pearson chi-square, Fisher's exact and chi-square tests were used for statistical analysis of trends. P<0.05 was considered statistically significant. Results: Fourty seven patients (64.4%) were male and 26 (35.6%) were women. In the background of the patients it was identified hypertension as the most common rate of 68.5%. The most common complaints identified were chest pain (53.4%) and back pain (42.5%). It has been determined 68 (93.1%) patients to whom CT have scanned and 27 out of 42 (64.3%) patients to whom TTE have scanned were found to have AAD. According to the DeBakey classification, 31 (42.5%) were DeBakey type 1, 18 (24.7%) DeBakey type 2 and 24 (32.9%) DeBakey type 3 as the AAD. Conclusion: Aortic dissection is still a highly mortality disease. The most important condition to reduce the mortality was thought the early diagnosis and the appropriate surgical intervention.Amaç: Akut aort diseksiyonu (AAD) acil serviste tanısı oldukça zor konulmasına rağmen mortalitesi çok yüksek bir hastalıktır. Bu nedenle, acil tıp kliniğine başvuran AAD tanılı hastaların demografik özellikleri, klinik, laboratuvar ve radyolojik bulgularının mortalite üzerine etkilerini araştırmayı amaçladık. Gereç ve Yöntemler: Çalışmamızda Ocak 2010 ile Ekim 2015 tarihleri arasında acil tıp kliniğinde AAD tanısı konulan ve çalışmaya dahil edilen 73 hasta geriye dönük incelendi. Yaş, cinsiyet, başvuru şikayetleri, özgeçmişleri, arteriyel kan basınçları, nabız sayısı, istenilen laboratuvar tetkikleri, transtorasik ekokardiyografi (TTE), kontrastlı torakoabdominal bilgisayarlı tomografi (BT) mortalite ve diseksiyon tipi