Study Comparing Hemiarch Replacement and Hemiarch Plus Stent Implantation in Acute Aortic Dissection

Inclusion Criteria: 1. Patient´s age is between 18 and 80 years. 2. Patient is willing and able to give informed consent. 3. Patient has acute DeBakey Type I and requires repair or replacement of damaged or diseased vessels of the ascending aorta. 4. Patient not in coma/irreversible end organ failure/cardiac massage for resuscitation, at the time of consent. Exclusion Criteria: 1. Patient has aortic arch diameter of more than 4.5 cm 2. Patient has known connective tissue disease or genetically linked aortopathy 3. Patient has entry tear over aortic arch 4. Patient with DeBakey Type II aortic dissection 5. Patient has co-morbidity (i.e. active malignancy (progressive, stable or partial remission)) causing expected survival to be less than 2 years. 6. Patient has any other medical, social, or psychological problems, that in the opinion of the investigator, preclude the patient from participating in this study.