Evaluation of the downstream aorta after frozen elephant trunk repair for aortic dissections in terms of diameter and false lumen status.

OBJECTIVES: To analyse the clinical outcomes of surgical repair of DeBakey type I and III aortic dissection (AD) by using the frozen elephant trunk (FET) technique, and to evaluate the postoperative behaviour of the residual aorta.
METHODS: In total, 27 consecutive patients underwent treatment of the thoracic aorta for AD with the FET technique in a tertiary-care hospital in Vienna/Austria between 2005 and 2012, and were enrolled in this case series study. All operations were performed under circulatory arrest and bilateral antegrade cerebral perfusion. During the follow-up, a clinical examination was performed as well as aortic diameters and false lumen (FL) patency evaluated by computed tomography (CT) imaging at following levels: pulmonary bifurcation, diaphragm and coeliac trunk.
RESULTS: The mean age of the patient cohort was 56 ± 12 years; 21 patients were male. Twenty-two (82%) and 5 (18%) patients presented with DeBakey type I and type III AD, respectively. The hospital mortality rate was 7% (2/28); 2 patients died due to non-aortic-related reasons during a follow-up period of 48 ± 26 months. Three (11%) patients had a stroke, and 2 (7%) a spinal cord injury. The follow-up CT scans revealed FL thrombosis in 96% of the patients at the level of the pulmonary bifurcation (P < 0.001). Distal to the stent graft, at the level of the diaphragm and coeliac trunk, FL patency was observed in 52% (P = 0.1) and 78% (P = 0.6) of the patients, respectively. The true lumen of all analysed aortic segments increased significantly while the mean aortic diameter remained stable.
CONCLUSIONS: Compared with conventional surgery for extensive ADs, the FET technique provides a high rate of FL thrombosis of the thoracic aorta.