Current understanding of patients with thoracoabdominal aortic aneurysms (TAAA) is limited to institutional case series and administrative data describing patients selected to undergo surgical repair. The purpose of this study is to describe a disease-based cohort of patients with TAAA, including those undergoing repair by various methods and those not having surgery. Data on patients with TAAA within a multihospital academic medical system were obtained from 2009 to 2017. This hospital system serves as the primary regional referral center for a population of 11 million. Patients were identified by two methods: an administrative database was screened by diagnosis codes for ruptured or nonruptured TAAA, and individual surgeons in our group identified their operative and nonoperative patients. The diagnosis of TAAA was then confirmed based on the computed tomography finding of aneurysmal degeneration >3.2 cm of the paravisceral aorta in continuity with aneurysmal aorta meeting standard criteria for repair. Patients under the age of 18 and those with mycotic aneurysms were excluded. The primary outcome measure among those operated upon was a composite measure of good outcome at 1 year, indicating survival with a return to preoperative functional status and freedom from permanent loss of organ system function. Statistical analysis was performed using StataIC version 14 (StataCorp, College Station, Tex). A total of 342 patients with TAAA were identified. Demographic details are reported in Table I. Patients demographics are similar to those in published operative case series. Patient outcomes are reported in Table II. There were 160 patients (47%) deemed ineligible for or declined treatment. At 1 year, a good outcome was achieved in 63%, 72%, 83%, and 53% of those undergoing open, endovascular, hybrid, and partial repairs, respectively. Reintervention was common, and occurred most frequently in the hybrid group. This inclusive cohort study of patients with TAAA shows that one-half of patients with TAAA did not undergo treatment, and an additional 16% had incomplete repair. Overall, two-thirds of patients with TAAA never went on to have definitive repair of the perivisceral aorta despite access to all treatment options, suggesting that data from operated case series are achieved among highly selected patient cohorts and do not reflect the overall outcomes of patients with TAAA. A majority of patients with TAAA never undergo repair, and that among those who are repaired, similar results are achieved with different techniques in appropriately selected patients.Table IKey demographics of thoracoabdominal aortic aneurysm (TAAA)a patientsOpenEndovascularbHybridcPartial repairdNonoperativeeTotalPn41661956160342Age, median617563707272<.001Sex, %.002 Male68.374.263.271.449.460.9 Female31.725.836.828.650.639.1Diameter, mean, cm6.56.86.96.56.36.5.038Presentation, %.19 Asymptomatic78.081.884.266.181.379.6 Symptomatic17.116.715.821.413.315.0 Ruptured4.91.5-12.55.35.4 Dissection41.54.538.948.224.527.3<.001Crawford, %<.001 Extent I7.315.210.535.710.615.7 Extent II34.124.268.453.636.238.8 Extent III19.519.75.35.49.411.6 Extent IV34.139.415.85.437.531.6 Extent V4.91.5--3.82.7CTD, %26.8-31.67.12.57.3<.001Preoperative exercise tolerance, %<.001 High44.422.26.722.77.618.1 Moderate25.042.973.347.719.532.8 Low30.634.920.029.572.949.1Previous aortic surgery, %46.343.947.442.943.844.2.99Significant comorbidity, %f10.016.75.629.151.027.5<.001CTD, Connective tissue disease.aTAAA is defined as aneurysmal dilatation of the paravisceral aorta of at least 3.2 cm in continuity with aneurysmal aorta that exceeds a maximum diameter of 5.5 cm or aortic size index of 2.75 (defined as body surface area divided by maximum diameter of aneurysmal aorta), causes symptoms, or grows more than 5 mm within 6 months.bEndovascular repair includes those repairs that treat the paravisceral aorta. Nearly all endovascular repairs were conducted with a physician-modified branched thoracic endovascular aortic repair endograft under a Food and Drug Administration-approved investigative device exemption trial.cHybrid repair is defined as visceral debranching and subsequent bypass from the iliac arteries to the paravisceral arteries followed by coverage of the paravisceral segment with thoracic endovascular aortic repair.dPartial repair is defined as any intervention that incompletely addresses the paravisceral aorta.eNonoperative group includes those patients who refused intervention, remained undecided, had yet to follow-up on a recommendation for intervention, or received a recommendation against intervention.fSignificant comorbidity is defined as the presence of one or more of the following: dependent functional status, untreated cancer, chronic obstructive pulmonary disease on home oxygen, active substance abuse, unintentional weight loss > 10% of body weight, dementia or significant cognitive impairment, and/or body mass index <18.5 or >40 kg/m2. Open table in a new tab Table IIKey outcome measures after thoracoabdominal aortic aneurysm (TAAA) repairOpenEndovascularHybridPartial repairAll operativeIndex hospitalization n41661956182 Mortality, %2051179 Permanent spinal cord injury, %17145511 RF requiring dialysis at discharge, %721144 Discharged home, %5173637167Follow-up Composite “good” outcome at one- year follow-up, %a (nb)63 (27)72 (47)83 (12)53 (41)65 (127) Any aortic reintervention, %1729422537RF, Renal failure.aComposite “good” outcome is defined as freedom from permanent spinal cord injury or renal failure and return to previous functional status at the 1-year follow-up (6-18 months). For patients who had staged repairs in either the open, endovascular, or hybrid groups, a “good” result also implies that all stages were completed. On the other hand, partial repairs are by definition incomplete and thus a "good outcome" for this group excludes completeness as a criterion.bIncludes all uncensored patients. 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