Case-control study on clinical features and long term effect of inflammatory abdominal aortic aneurysm in comparison with atherosclerotic abdominal aortic aneurysm        WANG Shao-ye, ZHANG Jian, YIN Ming-di, et al. Department of Vascular Surgery, the First Hospital, China Medical University, Shenyang 110001, China
Corresponding author: ZHANG Jian, E-mail: jianzhang_cmu@yahoo.com.cn
Abstract    Objective    To analyze clinical features and long term effect of inflammatory abdominal aortic aneurysm (iAAA). Methods    Between 1988 and 2008, 412 cases of AAA in the First Hospital of China Medical University were performed elective surgical operations. Eleven (2.7%) of them were diagnosed as iAAA. The former group was matched in a case control fashion to a group of 33 patients with aAAA with similar characteristics of age, gender and preoperative risk factors. All available clinical, pathologic and postoperative variables were reviewed retrospectively, and the two groups were compared. Results    In comparison with aAAA, patients with iAAA were more symptomatic significantly (100% vs. 42.4%, P=0.001) and had larger aneurysm size on admission ［(7.4±0.7)cm vs. (6.3±0.9) cm，P=0.006］, and preoperative erythrocyte sedimentation rate was found to be elevated significantly ［(44.5±9.1)mm/h vs. (11.4±5.4)mm/h，P<0.05］. Surgical morbidity and mortality rates did not differ between two groups. The operation time of patients with iAAA was longer than patients with aAAA significantly ［(308±36)min vs. (224±46)min, P<0.05］, and cross-clamp time was similar in both groups［(41.5±6.2) min vs. (41.8±6.2)min, P= 0.92］. A five-year survival rate analysis showed no significant difference between two groups (P=0.711) . Conclusion    Despite the more symptomatic, larger size and long operation time of iAAA, iAAA can be treated with low morbidity and mortality similar as aAAA now. Long term effect of iAAA is of no difference from aAAA.