Study Population
We identified all adult hospitalizations (aged >18 years) that were associated with a diagnosis code of dissection or aneurysm of the thoracic aorta without rupture (ICD-9-CM 441.00, 441.01, 441.03, 441.9, and ICD-10-CM I71.00, I71.01, I71.03, I71.2, I71.5). Then, we proceed to identify admissions associated with a TEVAR procedure. To exclude patients undergoing TEVAR in the aortic arch surgical reconstruction setting, patients with codes indicating Type A dissection, cardioplegia, valve repair, or an operation on vessels of the heart were excluded (see Supplemental Table 1 ). Patients were stratified by race and ethnicity. Figure 1 is a CONSORT diagram depicting the patient population and groups of analysis.