Arachidonic Acid, but Not Omega-3 Index, Relates to the Prevalence and Progression of Abdominal Aortic Aneurysm in a Population-Based Study of Danish Men

Jes S Lindholt, Katrine L Kristensen, Elena Burillo, Diego Martinez-Lopez, Carlos Calvo, Emilio Ros, Jose L Martín-Ventura, Aleix Sala-Vila

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Abstract

BACKGROUND: Animal models support dietary omega-3 fatty acids protection against abdominal aortic aneurysm (AAA), but clinical data are scarce. The sum of red blood cell proportions of the omega-3 eicosapentaenoic and docosahexaenoic acids, known as omega-3 index, is a valid surrogate for long-term omega-3 intake. We investigated the association between the omega-3 index and the prevalence and progression of AAA. We also investigated associations between AAA and arachidonic acid, an omega-6 fatty acid that is a substrate for proinflammatory lipid mediators.

METHODS AND RESULTS: We obtained blood samples from 498 AAA patients (maximal aortic diameter ≥30 mm) within a population-based ultrasound-screening trial in men and from 199 age-matched controls who screened negative. We determined the fatty acids of red blood cells by gas chromatography. During a median follow-up of 4.85 years, 141 AAA patients reached criteria for vascular surgical repair. Participants were high consumers of omega-3 (average omega-3 index: 7.6%). No significant associations were found for omega-3 index. In contrast, arachidonic acid in AAA patients was higher than in controls (P<0.001), and individuals in the upper tertile of arachidonic acid at baseline had higher probability of having AAA (odds ratio: 1.309; 95% confidence interval, 1.021-1.678; P=0.033). AAA patients at the upper tertile of arachidonic acid at baseline had a 54% higher risk of needing surgical repair during follow-up (hazard ratio: 1.544; 95% confidence interval, 1.127-2.114; P=0.007).

CONCLUSIONS: Omega-3 index is unrelated to men with AAA from a country in which fish consumption is customarily high. Arachidonic acid is associated with AAA presence and progression.

CLINICAL TRIAL REGISTRATION: URL: https://www.clinicaltrials.gov. Unique identifier: NCT00662480.

Original languageEnglish
Article numbere007790
JournalJournal of the American Heart Association
Volume7
Issue number3
Number of pages8
ISSN2047-9980
DOIs
Publication statusPublished - 1. Feb 2018

Keywords

  • Abdominal aortic aneurysm
  • Diet
  • Inflammation

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