CT Attenuation of Periaortic Adipose Tissue in Abdominal Aortic Aneurysms.
Samuel Debono, Evangelos Tzolos, Maaz B J Syed, Jennifer Nash, Alexander J Fletcher, Marc R Dweck, David E Newby, Damini Dey, Rachael O Forsythe, Michelle C Williams
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Abstract
Purpose To assess periaortic adipose tissue attenuation at CT angiography in different abdominal aortic aneurysm disease states. Materials and Methods In a retrospective observational study from January 2018 to December 2022, periaortic adipose tissue attenuation was assessed at CT angiography in patients with asymptomatic or symptomatic (including rupture) abdominal aortic aneurysms and controls without aneurysms. Adipose tissue attenuation was measured using semiautomated software in periaortic aneurysmal and nonaneurysmal segments of the abdominal aorta and in subcutaneous and visceral adipose tissue. Periaortic adipose tissue attenuation values between the three groups were assessed using Student t tests and Wilcoxon rank sum tests followed by a multiregression model. Results Eighty-eight individuals (median age, 70 years [IQR, 65-78]; 78 male and 10 female patients) were included: 70 patients with abdominal aortic aneurysms (40 asymptomatic and 30 symptomatic, including 24 with rupture) and 18 controls. There was no evidence of differences in the periaortic adipose tissue attenuation in the aneurysmal segment in asymptomatic patients versus controls (-81.44 HU ± 7 [SD] vs -83.27 HU ± 9; P = .43) and attenuation in nonaneurysmal segments between asymptomatic patients versus controls (-75.43 HU ± 8 vs -78.81 HU ± 6; P = .08). However, symptomatic patients demonstrated higher periaortic adipose tissue attenuation in both aneurysmal (-57.85 HU ± 7; P < .0001) and nonaneurysmal segments (-58.16 HU ± 8; P < .0001) when compared with the other two groups. Conclusion Periaortic adipose tissue CT attenuation was not increased in stable abdominal aortic aneurysm disease. There was a generalized increase in attenuation in patients with symptomatic disease, likely reflecting the systemic consequences of acute rupture. Keywords: Abdominal Aortic Aneurysm, Periaortic Adipose Tissue Attenuation, CT Angiography ClinicalTrials.gov registration no. NCT02229006 © RSNA, 2024.
腹主动脉瘤主动脉周围脂肪组织的 CT 衰减。
目的 评估不同腹主动脉瘤疾病状态下 CT 血管造影时主动脉周围脂肪组织的衰减情况。材料和方法 在 2018 年 1 月至 2022 年 12 月的一项回顾性观察研究中,对无症状或有症状(包括破裂)的腹主动脉瘤患者以及无动脉瘤的对照组在 CT 血管造影时的主动脉周围脂肪组织衰减进行了评估。使用半自动软件测量了腹主动脉瘤周围和非瘤段以及皮下和内脏脂肪组织的脂肪组织衰减。使用学生 t 检验和 Wilcoxon 秩和检验评估三组之间的主动脉周围脂肪组织衰减值,然后使用多元回归模型进行评估。结果 共纳入 88 名患者(中位年龄 70 岁 [IQR,65-78];男性 78 名,女性 10 名):其中包括 70 名腹主动脉瘤患者(40 名无症状,30 名有症状,包括 24 名破裂患者)和 18 名对照组患者。无症状患者与对照组动脉瘤节段的主动脉周围脂肪组织衰减(-81.44 HU ± 7 [SD] vs -83.27 HU ± 9;P = .43)以及无症状患者与对照组非动脉瘤节段的衰减(-75.43 HU ± 8 vs -78.81 HU ± 6;P = .08)无明显差异。然而,与其他两组相比,无症状患者的动脉瘤节段(-57.85 HU ± 7; P < .0001)和非动脉瘤节段(-58.16 HU ± 8; P < .0001)的主动脉周围脂肪组织衰减程度更高。结论 在稳定的腹主动脉瘤疾病中,主动脉周围脂肪组织 CT 衰减没有增加。有症状的患者的衰减普遍增加,这可能反映了急性破裂的全身性后果。关键词:腹主动脉瘤腹主动脉瘤 主动脉周围脂肪组织衰减 CT 血管造影 ClinicalTrials.gov registration no.NCT02229006 © RSNA, 2024.
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