Document Detail


Coronary endothelial function in hyperhomocysteinemia: improvement after treatment with folic acid and cobalamin in patients with coronary artery disease.
MedLine Citation:
PMID:  12204509     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVES: We evaluated the effect of therapy with folic acid and cobalamin on coronary endothelial function, expressed as a change in volumetric coronary blood flow (CBF), in hyperhomocysteinemic patients with coronary artery disease (CAD). BACKGROUND: Hyperhomocysteinemia is an independent risk factor for CAD. The mechanism responsible for this increased risk is unclear, but it is generally assumed that hyperhomocysteinemia causes endothelial dysfunction. It is unknown whether lowering plasma homocysteine levels with folic acid and cobalamin improves coronary endothelial function in patients with hyperhomocysteinemia and symptomatic CAD. METHODS: Fifteen patients scheduled for elective percutaneous transluminal coronary angioplasty (PTCA) with plasma homocysteine levels of >or=16 micromol/l were randomized for six months of treatment with folic acid 5 mg and cobalamin 400 microg daily or placebo. Coronary endothelial function was evaluated in a non-PTCA vessel using acetylcholine infusion in dosages of 10(-8) M, 10(-7) M, and 10(-6) M. Endothelium- dependent CBF is determined using intracoronary Doppler velocity and quantitative coronary angiography at baseline and after six months. RESULTS: In the folic acid/cobalamin treated group, CBF increased after acetylcholine infusion with 96% (standard deviation 54; 95% confidence interval [CI]: 44% to 154%) compared with a decrease of 16% (standard deviation 35; 95% CI: -20% to +30%) of the CBF in the placebo-treated group (p < 0.005). CONCLUSIONS: This is the first prospective randomized placebo-controlled intervention study evaluating coronary endothelial function in hyperhomocysteinemic patients with CAD. Our results suggest that coronary endothelial function improves after treatment with folic acid and cobalamin.
Authors:
Frank F Willems; Wim R M Aengevaeren; Godfried H J Boers; Henk J Blom; Freek W A Verheugt
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Publication Detail:
Type:  Clinical Trial; Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of the American College of Cardiology     Volume:  40     ISSN:  0735-1097     ISO Abbreviation:  J. Am. Coll. Cardiol.     Publication Date:  2002 Aug 
Date Detail:
Created Date:  2002-09-02     Completed Date:  2002-09-17     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8301365     Medline TA:  J Am Coll Cardiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  766-72     Citation Subset:  AIM; IM    
Affiliation:
Department of Cardiology, Rijnstate Hospital, Arnhem, The Netherlands. willemsf@xs4all.nl
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MeSH Terms
Descriptor/Qualifier:
Adult
Aged
Coronary Circulation / drug effects,  physiology
Coronary Disease / complications,  drug therapy,  physiopathology*
Coronary Vessels / drug effects*,  physiopathology
Endothelium, Vascular / drug effects*,  physiopathology
Female
Folic Acid / pharmacology*,  therapeutic use
Humans
Hyperhomocysteinemia / complications,  drug therapy,  physiopathology*
Male
Middle Aged
Prospective Studies
Vitamin B 12 / pharmacology*,  therapeutic use
Chemical
Reg. No./Substance:
59-30-3/Folic Acid; 68-19-9/Vitamin B 12

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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