Abstract 19354: Management and Outcomes of Acute Type B Dissection in IRAD Treated with Open Surgery, Endovascular Flap Fenestration or TEVAR

Background: The debate for the optimal treatment of complicated Type B Acute Aortic Dissection (TBAAD) is primarily focused upon open surgical intervention versus thoracic endovascular aortic repair (TEVAR). The technique of fenestration with stenting has been proposed to resolve malperfusion. This study evaluated post-procedural outcomes of all three approaches for TBAAD. Methods: TBAAD patients enrolled in the International Registry of Acute Aortic Dissection were stratified by management type: TEVAR, fenestration and stenting, and surgery. Results: Of the 552 patients with TBAAD, 231 (41.8%) underwent TEVAR, 214 (38.8%) standard open surgery, and 107 (19.4%) fenestration and stenting. TEVAR or fenestration and stenting were more likely to be performed in classic double barrel aortic dissection when compared to open surgery (73.2%, 76.6%, 52.8% respectively; p<0.001). Patients treated with open repair were less likely to have distal extension into the abdominal aorta than those with TEVAR or fenestration and stenting (47.7%, 62.7%, 86.4%, respectively; p<0.001). In-hospital mortality was similar between groups (11.7% TEVAR, 14.0% fenestration and stenting, 15.9% surgery). At five years, Kaplan-Meier post-discharge all-cause survival estimates were highest for TEVAR, followed by endovascular fenestration and finally open surgical intervention (85.2%, 78.3%, 67.2%, respectively; p=0.039). Conclusion: Patients treated by endovascular approaches, whether with flap fenestration or thoracic endovascular aortic repair, had lower five year mortality when compared to patients who required open repair in the setting of TBAAD. Either endovascular approach may be helpful in the treatment of TBAAD. Further research is needed to determine how much of the observed difference represents patient selection versus differential effects of treatment.