RADICAL REPLACEMENT OF THE AORTIC ROOT IN ACUTE TYPE-A DISSECTION - INDICATIONS AND OUTCOME

Objective. Failure of the repair at the proximal aorta is an important cause of morbidity and mortality following surgical treatment of acut e type A dissection. This review was undertaken to determine the influ ence of total composite replacement of the ascending aorta and the roo t on the operative risk and longterm survival. Methods. In a consecuti ve series of 73 patients With acute type A dissections between 1985 an d 1994, 19 (26%) patients with radical root replacement (group Ij were compared with 54 patients who had conventional valve-preserving root reconstruction (group II). Results. Group I represented a higher opera tive risk with the presence of significant aortic regurgitation (13/19 68.4% vs 23/54 42.5% P<0.05), aortic dilatation (19/19 100% vs 32/54 59.2% P<0.00), and coronary dissection (13/19 68.4% vs 3/54 5.5% P<0.0 00). In spite of this there was no difference in operative mortality ( 3/19 15.7% vs 7/54 12.9%, NS) or the occurrence of major postoperative complications: bleeding (3/19 15.7% vs 7/54 12.9%, NS), respiratory ( 5/19 26.3% vs 11/54 20.3%, NS), stroke (2/19 10.5% vs 3/54 5.5%, NS). Patients with radical root replacement had substantially better event- free survival at 5 years (87.5%+/-11.7% vs 67.1%+/-8.9%) and 9 years ( 87.5%+/-21.9% vs 63.0%+/-19.2%). Conclusions. This experience confirms that, in the treatment of acute type A dissection, an aggressive appr oach to aortic root pathology is indicated for specific indications, a nd can be carried out with good early and excellent long-term results.