Systematic review and meta-analysis of the association between intraluminal thrombus volume and abdominal aortic aneurysm rupture

Singh, Tejas P., Wong, Shannon A., Moxon, Joseph V., Gasser, T. Christian, and Golledge, Jonathan (2019) Systematic review and meta-analysis of the association between intraluminal thrombus volume and abdominal aortic aneurysm rupture. Journal of Vascular Surgery, 70 (6). e10. pp. 2065-2073.

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Abstract

Background: Intraluminal thrombus (ILT) is present in most abdominal aortic aneurysms (AAAs), although its role in AAA progression is controversial.

Methods: A literature search was performed to identify studies that investigated the association between ILT volume and AAA rupture. A study assessment tool was developed to assess the methodologic quality of included studies. A meta-analysis was conducted using an inverse variance-weighted random-effects model to compare the ILT volume in ruptured and asymptomatic intact AAAs. Leave-one-out sensitivity analyses were conducted to assess the robustness of the findings. A subanalysis was performed including studies in which patients with asymptomatic intact and ruptured AAAs were matched for aortic diameter. Interstudy heterogeneity was assessed using the I-2 statistic.

Results: Eight studies involving 672 patients were included in this systematic review. Meta-analysis of all studies found a greater ILT volume in patients with ruptured AAAs than in patients with asymptomatic intact AAAs (standardized mean difference, 0.56; 95% confidence interval, 0.17-0.96; P = .005; I-2 = 79.8%). Sensitivity analyses suggested that the findings were robust; however, aortic diameter was significantly larger in ruptured than in asymptomatic intact AAAs (mean 6 standard deviation, 78 +/- 18 and 64 +/- 15 mm, respectively; P < .001). In the subanalysis of studies that matched for diameter, no significant difference in ILT volume between groups was found (standardized mean difference, 0.03; 95% confidence interval, -0.27 to 0.33; P = .824; I-2 = 0%).

Conclusions: This meta-analysis suggests that ILT volume is greater in patients with ruptured AAAs than in patients with asymptomatic intact AAAs, although this is most likely due to the larger diameter of ruptured AAAs.

Item ID: 61235
Item Type: Article (Research - C1)
ISSN: 1097-6809
Keywords: Abdominal aortic aneurysm, Rupture, Thrombus, Prognosis
Copyright Information: © 2019 Published by Elsevier Inc. on behalf of the Society for Vascular Surgery.
Funders: Townsville Hospital and Health Service (THHS), Queensland Government, National Health and Medical Research Council of Australia (NHMRC)
Projects and Grants: NHMRC 1117061
Date Deposited: 18 Dec 2019 07:44
FoR Codes: 11 MEDICAL AND HEALTH SCIENCES > 1102 Cardiovascular Medicine and Haematology > 110299 Cardiovascular Medicine and Haematology not elsewhere classified @ 100%
SEO Codes: 92 HEALTH > 9201 Clinical Health (Organs, Diseases and Abnormal Conditions) > 920103 Cardiovascular System and Diseases @ 100%
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