Document Detail


Increased myocardial ischemia after food is not explained by endothelial dysfunction.
MedLine Citation:
PMID:  12422137     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: Recent studies suggest that a high-fat meal can impair endothelial function. The aim of this study was to determine whether greater myocardial ischemia after either a low-fat or a high-fat meal is associated with an increase in brachial artery endothelial dysfunction. METHODS: Twenty subjects with coronary artery disease and > or =1-mm ST-segment depression during exercise were studied. In a randomized, double-blind, crossover design, ST-segment changes during treadmill exercise and brachial artery diameter and flow-mediated dilation were measured before and 3 hours after a low-fat milkshake meal or the same meal supplemented with 64 grams of cooked fat. RESULTS: After the low-fat but not the high-fat meal, resting brachial artery diameter decreased (before meal 4.72 +/-0.50 mm, after low fat meal 4.62 +/-0.49 mm, P =.001; after high fat meal 4.70 +/-0.51 mm, not significant). High-flow brachial artery diameter was similar before (4.81 +/- 0.48 mm) and after the low-fat (4.82 +/- 0.48 mm) and high-fat (4.84 +/- 0.48 mm) meals (P >.05 for all). Brachial artery flow-mediated dilation was not impaired after either meal. Exercise duration decreased more after the low-fat meal (mean change 39 seconds, 95% CI -14 to -63 seconds, P =.004) than after the high-fat meal (-7 seconds, 95% CI +19 to -34 seconds, not significant). ST-segment depression during equivalent exercise was greater after compared with before both meals (before meals 1.03 +/- 0.69 mm, after low fat 1.27 +/- 0.80 mm, P =.03; after high fat 1.24 +/- 0.74 mm, P =.04). CONCLUSIONS: Increased myocardial ischemia after food is caused by mechanisms other than endothelial dysfunction and by meal components other than cooked fat.
Authors:
Colin Edwards; Ralph A H Stewart; Krishnan Ramanathan; Teena M West; John K French; Harvey D White
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Publication Detail:
Type:  Clinical Trial; Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  American heart journal     Volume:  144     ISSN:  1097-6744     ISO Abbreviation:  Am. Heart J.     Publication Date:  2002 Nov 
Date Detail:
Created Date:  2002-11-07     Completed Date:  2002-12-30     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370465     Medline TA:  Am Heart J     Country:  United States    
Other Details:
Languages:  eng     Pagination:  E8     Citation Subset:  AIM; IM    
Affiliation:
Cardiovascular Research Unit, Green Lane Hospital, Auckland, New Zealand.
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MeSH Terms
Descriptor/Qualifier:
Adult
Aged
Aged, 80 and over
Angina Pectoris / etiology*,  physiopathology
Brachial Artery / physiopathology*
Coronary Disease / etiology*,  physiopathology
Cross-Over Studies
Diet, Atherogenic
Diet, Fat-Restricted
Dietary Fats / adverse effects*
Double-Blind Method
Endothelium, Vascular / physiopathology*
Exercise Test
Female
Humans
Male
Middle Aged
Regional Blood Flow
Time Factors
Vasodilation / physiology
Chemical
Reg. No./Substance:
0/Dietary Fats

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


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