Abstract: A stent for endovascular repair in a subject having an aortic dissection or aneurysm in the ascending aorta and methods of using the same are described herein. The stent comprises an inner covered stent having an inner lumen and one or more fenestrations, and an expandable outer shell coupled to the inner covered stent to form a fluid-tight chamber surrounding the inner covered stent. The one or more fenestrations provide fluid communication between the inner lumen and the fluid-tight chamber. The method of using the stent comprises deploying the endovascular stent in a constricted configuration in which the inner covered stent has a reduced diameter. The method further comprises expanding the outer shell to conform to the shape of the ascending aorta and cover an intimal tear of the aortic dissection, and moving the inner covered stent from the constricted configuration to an expanded configuration having an enlarged diameter.