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Inflammation in the walls of asymptomatic abdominal aortic aneurysms is not associated with increased metabolic activity detectable by 18-fluorodeoxglucose positron-emission tomography.
MedLine Citation:
PMID:  22854268     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
OBJECTIVE: We hypothesized that the general inflammation observed in the wall of large, asymptomatic abdominal aortic aneurysms (AAAs) could be detected in vivo by 18-fluorodeoxglucose (FDG) positron-emission tomography (PET) and, if so, that this method could be used to study if active inflammation is an early pathogenetic finding in small AAAs detected by screening. METHODS: In this prospective clinical study, 12 men were examined with FDG-PET computed tomography. Seven had large asymptomatic AAAs (range, 52-66 mm) that required surgery, and five had small AAAs (range, 34-40 mm) under surveillance. In the surgery group, biopsy specimens were taken from the aneurysm wall for histologic examinations. RESULTS: Compared with normal segments of the aorta, liver, and blood and compared with healthy controls matched for age and sex, no increased FDG uptake, measured as standardized uptake value, was detected in any of the large or small AAAs. The SUV(mean) difference between infrarenal aorta and blood was -0.3 for cases and -0.1 for controls (P = .06). The corresponding differences between the infrarenal aorta and liver was -0.8 and -0.8 (P = .91) and between infrarenal aorta and suprarenal aorta was -0.2 and -0.1 for cases and controls, respectively (P = .20). The histologic examination of the aneurysm walls showed high inflammatory cell infiltration with T lymphocytes, B lymphocytes, and macrophages. CONCLUSIONS: The chronic inflammation observed in the wall of asymptomatic AAAs was not sufficiently metabolically active to result in an increased glucose metabolism detectable by FDG-PET by means of this standard protocol. To study the importance of inflammation in the pathogenesis of AAAs in vivo, PET tracers other than FDG need to be developed.
Authors:
Gustaf Tegler; Katharina Ericson; Jens Sörensen; Martin Björck; Anders Wanhainen
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-7-30
Journal Detail:
Title:  Journal of vascular surgery : official publication, the Society for Vascular Surgery [and] International Society for Cardiovascular Surgery, North American Chapter     Volume:  -     ISSN:  1097-6809     ISO Abbreviation:  J. Vasc. Surg.     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-8-2     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8407742     Medline TA:  J Vasc Surg     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Crown Copyright © 2012. Published by Mosby, Inc. All rights reserved.
Affiliation:
Department of Surgical Sciences, Section of Vascular Surgery, Uppsala University Hospital, Uppsala, Sweden.
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