Plasma total homocysteine is associated with abdominal aortic aneurysm and aortic diameter in older men

Wong, Yuen Y.E., Golledge, Jonathan, Flicker, Leon, McCaul, Kieran A., Hankey, Graeme J., van Bockxmeer, Frank M., Yeap, Bu B., and Norman, Paul E. (2013) Plasma total homocysteine is associated with abdominal aortic aneurysm and aortic diameter in older men. Journal of Vascular Surgery, 58 (2). pp. 364-370.

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Objective: This study was conducted to determine whether plasma total homocysteine (tHcy) and the methylenetetrahydrofolate reductase (MTHFR) C677T polymorphism are associated with abdominal aortic aneurysm (AAA) and aortic diameter.

Methods: This was a cross-sectional study set in Western Australia of 4248 community-dwelling men aged 70 to 88 years. Infrarenal aortic diameter was measured using ultrasound scan, tHcy was measured by immunoassay, and MTHFR 677T polymorphism was detected by polymerase chain reaction.

Results: Adjusted multinomial logistic regression analysis showed the odds of having an AAA (aortic diameter ≥30 mm) for men with high tHcy (≥15 μmol/L) compared with those with normal tHcy (<15 μmol/L) was 1.45 (95% confidence interval [CI], 1.10-1.91). Every 5-μmol/L increment in tHcy was associated with 0.15-mm (95% CI, 0.01-0.28 mm) increase in mean aortic diameter. The tHcy concentration was higher in MTHFR TT homozygote individuals than in wild-type CC individuals. There was, however, no apparent association between MTHFR C677T polymorphism with AAA (TT vs CC genotype: odds ratio, 0.97; 95% CI, 0.72-1.31) or aortic diameter (TT vs CC genotype: mean increment of 0.01 mm; 95% CI, −0.63 to 0.65 mm).

Conclusions: Elevated tHcy is associated with the presence of AAA in older men. There is also a positive dose-response relationship between tHcy and abdominal aortic diameter. Longitudinal studies and clinical trials of lowering tHcy are required to assess whether these relationships are causal.

Item ID: 29171
Item Type: Article (Research - C1)
ISSN: 1097-6809
Date Deposited: 04 Sep 2013 05:26
FoR Codes: 11 MEDICAL AND HEALTH SCIENCES > 1102 Cardiovascular Medicine and Haematology > 110201 Cardiology (incl Cardiovascular Diseases) @ 100%
SEO Codes: 92 HEALTH > 9201 Clinical Health (Organs, Diseases and Abnormal Conditions) > 920103 Cardiovascular System and Diseases @ 100%
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