Endovascular AAA repair attenuates the inflammatory and renal responses associated with conventional surgery

Purpose: To quantify the inflammatory and renal parameters in comparative c ohorts of patients undergoing surgical or endovascular repair of abdominal aortic aneurysms (AAAs). Methods: Forty-three patients (41 men; ages 58-81 years) underwent endovasc ular or conventional aneurysm surgery according to aortic morphology. All p atients received a standard general anesthetic and had 12 serial blood and urine samples collected during the perioperative period. Samples underwent analysis for the cytokines interleukin (IL) 1 beta, tumor necrosis factor-a lpha (TNF-alpha), and IL-6. White cell and platelet activation were estimat ed indirectly by measuring sl-selectin and 11-dehydrothromboxane B-2, respe ctively. The urinary albumin:creatinine ratio (ACR) and N-acetyl-beta-D-glu cosaminidase (NAG) activity were estimated to assess renal injury. Fibrinog en and fibrinogen degradation products were calculated to assess activation of the clotting cascade. Results: Twenty-three patients underwent endovascular AAA repair and 20 had conventional surgery. Concentrations of IL-6 (p < 0.002) and TNF-alpha (p < 0.0004) were significantly higher in the conventional group. The ACR (p < 0.002) and urinary NAGs (p < 0.0009) were also significantly higher in thi s group, suggesting greater renal injury. Platelet activity was significant ly greater in the endovascular group (p < 0.01), perhaps indicating thrombu s organization within the aneurysm sac. Conclusions: These data suggest that the inflammatory response associated w ith conventional aneurysm repair is largely obviated by endovascular techni ques. This may potentially translate to a lower incidence of multiple organ failure after endovascular surgery.