Background and Goal of Study: 
Although thoracic endovascular aortic repair (TEVAR) was initially used to treat patients considered unfit for surgery, it is now the preferred technique given its improved risk profile compared to open thoracic aortic surgery. Acute kidney injury (AKI) is a known complication, increasing surgical morbidity and mortality. The aim of this study was to revise the patients’ characteristics, anaesthetic approach and outcomes of TEVAR at our hospital. 
Materials and Methods: 
We performed a retrospective analysis of patients undergoing TEVAR from 2006 to 2013 excluding patients without perioperative serum creatinine values. Patients’ demographics and perioperative data were collected. AKI was defined as a rise of 0.3 mg/dl in postoperative serum creatinine. Descriptive analysis was performed and the Student’s-T, Mann-Whitney, Fischer's exact or Chi-square tests were used. Univariate logistic regression were done with calculation of an Odds Ratio (OR) and its 95% Confidence Interval. 
Results and Discussion:
We included 28 patients, 26 were male. The procedure was urgent in 61% of cases. ASA physical status was II (21%), III (36%), IV (39%) and V (4%). Frequent comorbidities were: 79% arterial hypertension, 64% chronic pulmonary disease, 46% dyslipidaemia, 36% tobacco consumption, 29% chronic kidney disease, 25% auricular fibrillation, 20% coronary disease, 18% diabetes mellitus, 14% cerebrovascular disease, 14% congestive heart failure. Patients were submitted to general (54%), regional (42%) or local anaesthesia with sedation (4%). Red blood cells (RBC) were transfused intraoperatively in 25% of cases. Preoperative aneurysm diameter was 65 [54-86] mm and surgery duration was 4 [2-6] hours. After surgery, 6 patients had AKI, 2 presented with stroke and 2 died during hospital stay. In univariate analysis, surgery duration (OR 1.7, p= 0.032) and intraoperative RBC transfusion (OR 3.4, p=0.05) were identified as predictors of AKI. Post-operative AKI was associated with longer hospital stay (p=0.009). 
Conclusions: 
Patients undergoing TEVAR have important comorbidities. Longer surgery and intraoperative RBC transfusion increased the risk of AKI. Surgery duration could be significant because of 2 factors: surgical complexity and amount of contrast used during surgery. A limitation of our study is not having this data available for analysis.

Thoracic endovascular aortic repair: eight years of experience in a tertiary hospital