Predictors of in-hospital mortality and complications in acute aortic occlusion: a comparative analysis of patients with embolism and in-situ thrombosis

BACKGROUND Acute aortic occlusion (AAO) represents potentially fatal acute vascular emergency that requires prompt diagnosis and intervention. Clinical condition of patients with AAO is frequently severely devastated when surgical intervention is questionable. Our objective was to retrospectively review our institutional experience with AAO and assess predictors of intrahospital mortality and morbidity. METHODS This is a retrospective single-center cohort study with prospectively collected data between January 1, 2005 and January 1, 2018. The total number of 28 consecutive patients with AAO were included in our analysis. Patients with acute aortic thrombosis manifested by bilateral acute limb ischemia were divided in two groups based on potential caues of AAO (embolism or in-situ thrombosis) differentiated according to condition of aortoilical segment. RESULTS We identified 28 patients with AAO. All of them underwent either aortobifemoral bypass (N.=20, 71%) or bilateral trans-femoral thrombectomy (N.=8, 29%). The overall in-hospital mortality was 36%. Factors that influenced in-hospital mortality were: paralysis (OR=4.41, 95% CI: 1.88-21.78) and higher lactate values on admission (OR=1.23, 95% CI: 1.09-1.83), postoperative development of severe acute kidney injury (OR=3.08, 95% CI: 1.42-14.66), hemodialysis (OR=10.74, 95% CI: 1.64-109.78) and bowel ischemia (OR=5.19, 95% CI: 1.58-55.63). CONCLUSIONS Paralysis, higher lactate values, development of acute kidney injury, hemodialysis and bowel ischemia are predictors of worse outcome and may be used for risk stratification of patients with acute aortic occlusion and improve counseling patients and their families about expected postoperative outcomes. Patients with embolism and malignant disease have worse outcome; however, this should be tested in future studies on larger sample.