Total arch replacement: When and how?

Abstract

Acute type A aortic dissection (ATAAD) is a life-threatening disease, which often causes cardiac tamponade, rupture, and malperfusion. ATAAD is associated with a high hospital mortality rate. Open aortic surgery for ATAAD is always required to save the patient, particularly elderly patients. Tear-oriented surgery is recommended as the frontline treatment for ATAAD, and hemiarch replacement (HAR) is sufficient because the primary entry is often observed in the ascending aorta (60%-70%). However, HAR has some drawbacks, such as new creation of an anastomotic entry and unfavorable distal aortic remodeling during long-term follow-up. Although total arch replacement (TAR) is a demanding procedure, it is another useful option for ATAAD. Proper patient selection for TAR is controversial. Standardized procedure for TAR, including the optimal brain protection methods and the use of excellent sealed vascular prosthetic grafts, has been established over the past decades. Therefore, TAR is increasingly being selected for HAR in patients who are young or have enlarged aortic arch, severely dissected supra-aortic arch vessels, or hereditary thoracic aortic disorders. The emerging technology of commercially available frozen elephant trunk accelerated the application of TAR, facilitates distal anastomosis, and improves distal aortic remodeling. Although further evidence is required, TAR could be the best choice for HAR for selected patients. Currently, appropriate selection of the surgical technique is important to maximize the benefits of open surgery for ATAAD.