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Thromb Haemost. 1998 Dec;80(6):874-7.

Hyperhomocysteinemia and venous thrombosis: a meta-analysis.

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Department of Hematology, Leyenburg Hospital, The Hague, The Netherlands. m.denheijer@AIG.AZN.NL


Hyperhomocysteinemia is an established risk factor for atherosclerosis and vascular disease. Until the early nineties the relationship with venous thrombosis was controversial. At this moment ten case-control studies on venous thrombosis are published. We performed a metaanalysis of these reports. We performed a MEDLINE-search from 1984 through June 1997 on the keywords "homocysteine" or "hyperhomocysteinemia" and "venous thrombosis", which yielded ten eligible case-control studies. We found a pooled estimate of the odds ratio of 2.5 (95% CI 1.8-3.5) for a fasting plasma homocysteine concentration above the 95th percentile or mean plus two standard deviations calculated from the distribution of the respective control groups. For the post-methionine increase in homocysteine concentration we found a pooled estimate of 2.6 (95% CI 1.6-4.4). These data from case-control studies support hyperhomocysteinemia as a risk factor for venous thrombosis. Further research should focus on the pathophysiology of this relationship and on the clinical effects of reducing homocysteine levels by vitamin supplementation.

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