Reevaluating the Need for Routine Coverage of the Left Subclavian Artery in Thoracic Blunt Aortic Injury

Abstract

Thoracic endovascular aortic repair (TEVAR) is the treatment of choice for thoracic blunt aortic injury (TBAI). A 20mm proximal seal zone is recommended based on aneurysmal disease literature which often results in coverage of the left subclavian artery (LSA). The aim of this study was to analyze our experience with TEVAR for TBAI and evaluate whether 20mm is required to achieve successful remodeling. This is a single-center, retrospective study of all consecutive patients who received a TEVAR for treatment of moderate and severe TBAI between April 2014 and November 2018. Three-dimensional software reconstruction was used for computed tomography (CT) scan centerline measurements. Outcomes included technical success, need for reinterventions, and immediate and long-term aortic-related complications. Sixty-one patients underwent TEVAR for TBAI during the study period. Twenty-eight (46%) patients underwent LSA coverage with an average distance from the LSA to the injury of 6.4mm (0-15.1mm). Of the 33 (54%) patients who did not undergo coverage of the LSA, 22 patients (66%) had less than 20mm of proximal seal zone. The mean distance from the LSA to injury in this group was 16.6mm (7.9-29.5mm). None of the patients with LSA coverage developed ischemic symptoms, and an average decrease in left arm systolic blood pressure of 24.8mm Hg (0-62mm Hg) was noted versus the right arm. There was no aortic-related mortality in either group. Follow-up CT scans revealed excellent remodeling. Immediate outcomes of TEVAR for TBAI with LSA coverage are well tolerated; however, the long-term sequela of LSA coverage is unknown. Exclusion of the injury and excellent remodeling appear to occur with less than 20mm of proximal seal, and perhaps more attention should be made to preservation of the LSA.