• Satoshi Unosawa, Mitsumasa Hata, Tetsuya Niino, Kazuma Shimura, and Motomi Shiono.
• Department of Cardiovascular Surgery, Disaster Medical Center, Tokyo, Japan. unosaw@gmail.com
• J. Thorac. Cardiovasc. Surg.. 2013 Jul 1;146(1):67-71.

ObjectivesTo investigate the prognosis after emergency surgery for acute type A aortic dissection with an unknown entry site and to identify the predictors of postoperative aortic dilatation.MethodsThe subjects were 102 patients undergoing emergency surgery for acute type A dissection from July 2005 to October 2010. They were divided into group I (n = 45) undergoing aortic surgery without tear resection and group II (n = 57) undergoing resection that included the intimal tear.ResultsThe postoperative hospital mortality was similar, 13.3% (n = 6) in group I and 12.3% (n = 7) in group II. Of the 102 patients, 69 underwent follow-up computed tomography scanning after discharge, and the aortic diameter was significantly increased in group I compared with that in group II (P = .035). Dilatation of the descending aorta occurred in 21 patients (30.4%). Multivariate logistic regression analysis revealed that a patent false lumen (P = .027) and nonexclusion of the entry site (P = .012) were independent risk factors for aortic dilatation. No difference was found in the freedom from aorta-related clinical events at 4 years, with a rate of 81.9% in group I and 74.4% in group II. Also, no difference was found in the 4-year actuarial survival rate between groups I and II (86.4% and 78.5%, respectively).ConclusionsThe prognosis of patients without exclusion of the entry site was acceptable. Careful follow-up is needed for patients with a patent false lumen or nonexcluded entry because of the risk of aortic dilatation.Copyright © 2013 The American Association for Thoracic Surgery. Published by Mosby, Inc. All rights reserved.

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