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(Circulation. 2002;105:2712.)
© 2002 American Heart Association, Inc.
Clinical Investigation and Reports |
From the University of Texas Health Science Center at San Antonio (H.C.M., C.A.M.); the Southwest Foundation for Biomedical Research (H.C.M.), San Antonio, Tex; the Ohio State University (E.E.H.), Columbus, Ohio; and the Louisiana State University Health Sciences Center (A.W.Z., G.T.M., R.E.T., J.P.S.), New Orleans, La.
Correspondence to Henry C. McGill, Jr, MD, Southwest Foundation for Biomedical Research, PO Box 760549, San Antonio, TX 78245-0549. E-mail hmcgill{at}icarus.sfbr.org Reprint requests to Jack P. Strong, MD, Department of Pathology, Louisiana State University Health Sciences Center, 1901 Perdido St, New Orleans, LA 70112-1393. E-mail jstron@lsumc.edu
| Abstract |
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Methods and Results The Pathobiological Determinants of Atherosclerosis in Youth (PDAY) study collected arteries, blood, and other tissue from
3000 persons aged 15 to 34 years dying of external causes and autopsied in forensic laboratories. We measured gross atherosclerotic lesions in the right coronary artery (RCA), American Heart Association (AHA) lesion grade in the left anterior descending coronary artery (LAD), serum lipid concentrations, serum thiocyanate (for smoking), intimal thickness of renal arteries (for hypertension), glycohemoglobin (for hyperglycemia), and adiposity by body mass index (BMI) and thickness of the panniculus adiposus. BMI in young men was associated with both fatty streaks and raised lesions in the RCA and with AHA grade and stenosis in the LAD. The effect of obesity (BMI>30 kg/m2) on RCA raised lesions was greater in young men with a thick panniculus adiposus. Obesity was associated with non-HDL and HDL (inversely) cholesterol concentrations, smoking (inversely), hypertension, and glycohemoglobin concentration, and these variables accounted for
15% of the effect of obesity on coronary atherosclerosis in young men. BMI was not associated with coronary atherosclerosis in young women although there was trend among those with a thick panniculus adiposus.
Conclusions Obesity is associated with accelerated coronary atherosclerosis in adolescent and young adult men. These observations support the current emphasis on controlling obesity to prevent adult coronary heart disease.
Key Words: coronary heart disease atherosclerosis obesity risk factors youth
| Introduction |
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See p 2696
The Pathobiological Determinants of Atherosclerosis in Youth (PDAY) study was organized in 1985 to examine the effects of risk factors for adult CHD on atherosclerosis in autopsied persons aged 15 to 34 years dying of external causes.6 Previous reports have described the association of dyslipidemia, smoking, hypertension, hyperglycemia, and obesity with atherosclerosis in the coronary arteries and aorta.710 A previous analysis7 indicated little association of obesity with aortic atherosclerosis and a strong association with coronary atherosclerosis in men. The present report focuses on the effects of obesity on coronary atherosclerosis, consolidates previously reported results, adds
1300 cases (including over 300 women) to the analyses, examines the effects of fat distribution, and presents topographic maps of lesion prevalence in the right coronary artery. The results strongly support control of obesity in youth as important in the long-range primary prevention of atherosclerosis and its sequelae.
| Methods |
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Study subjects were persons aged 15 through 34 years who died of external causes (accident, homicide, or suicide) within 72 hours after injury and were autopsied within 48 hours after death in a forensic laboratory.8 The analyses in this report are based on 2133 men and 688 women accessioned between June 1, 1987 and August 31, 1994. The Institutional Review Board of each participating center approved this study.
Preparation of Arteries
The PDAY team dissected the right coronary artery (RCA) from the heart, opened it longitudinally, and fixed it in 10% neutral buffered formalin. The team perfused the left main coronary artery and the left anterior descending coronary artery (LAD) with formalin at a pressure of
100 mm Hg. A central laboratory stained the fixed RCAs with Sudan IV. Another central laboratory excised a block from the LAD just distal to the origin of the circumflex artery. Paraffin sections from half of this block were stained with Gomoris trichrome acid fuchsin (GTAF), and frozen sections from the other half were stained with Oil Red O.10 RCAs were available for 2736 cases, and LAD sections for 760 cases.
Body Mass Index
The body was weighed to the nearest 0.5 kg or 1 lb before tissue or fluids were removed from the body. Cadaver length, from the vertex of the cranium to the base of the heel, was measured to the nearest 1 cm or 0.5 in. We computed the body mass index (BMI) as weight (kilograms) divided by height (meters) squared. Cases were grouped into categories of BMI<25, 25
BMI
30, and BMI>30 kg/m2.
Panniculus Adiposus
The PDAY team measured subcutaneous abdominal fat, including the subcutaneous tissue from the inner edge of the rectus sheath, at a point halfway between the xiphoid process and the umbilicus, to the nearest 1 millimeter. Cases were classified as
or > the median value for their sex and BMI classification (men: 12, 20, and 30 mm; women: 20, 28, and 37 mm for BMI<25, 25
BMI
30, BMI>30, respectively) in order to reflect fat distribution rather than overall fat and to offset the known sex difference.
Other Risk Factors
Methods for postmortem assessment of the other risk factors are described in previous publications.79 Briefly, we measured total serum cholesterol and HDL cholesterol (after precipitation of other lipoproteins) by a cholesterol oxidase method and calculated non-HDL cholesterol by subtraction. Because some trauma victims receive large quantities of fluids, we excluded all serum data if the serum cholesterol concentration was <100 mg/dL. Smokers were identified by serum thiocyanate concentration
90 µmol/L. Hypertension was identified when the intimal thickness of small renal arteries indicated a mean blood pressure
110 mm Hg. Chronic hyperglycemia was indicated by a red blood cell glycohemoglobin concentration
8%.
Gross RCA Lesions
Three pathologists independently estimated the percentage of intimal surface involved by fatty streaks (flat intimal lesions stained by Sudan IV) and by raised lesions (fibrous plaques and other complicated lesions).8 The mean of the 3 grades was used in the statistical analyses.
Microscopic LAD Lesions
As described in a previous publication,10 2 pathologists reached a consensus grade according to the American Heart Association (AHA) system.11,12 In GTAF sections, the morphometry laboratory measured the intimal area and the potential lumen area as the maximum area that could occur within the measured length of the internal elastic lamina. We defined an intimal area
40% of the potential lumen area combined with an AHA grade
3 as atherosclerotic stenosis
40%.
Topographic RCA Maps
The morphometry laboratory digitized the image of each Sudan IVstained RCA and an outline of raised lesions on a black-and-white print and converted the images to a standard template.13 Composite images were assembled to indicate prevalence of each type of lesion at each location in the image of the artery.
Statistical Analysis
The associations of intimal surface involved by atherosclerosis, lipid risk factors, and glycohemoglobin with adiposity were analyzed by multiple regression analysis. A logit transformation, with a small constant added to avoid the logarithm of zero, was applied to the extent of surface area involved. We analyzed the prevalence of AHA grades using polytomous logistic regression.14 The associations of obesity with stenosis
40%, hypertension, and smoking were analyzed by binary logistic regression.
| Results |
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Women of both races had a thicker panniculus than men (P
0.0003). White men had a thicker panniculus than black men (P=0.0001), whereas white and black women were not significantly different (P=0.5456). The panniculus increased linearly with age in whites (P= 0.0001) and blacks (P=0.0008) although the rate of increase was greater in whites (P=0.0079).
The partial correlation coefficient between BMI and panniculus, adjusted for sex, race, and age, was 0.52 (P=0.0001).
Relation of Adiposity to Other Risk Factors
Table 2 shows that non-HDL cholesterol concentration was directly associated with both BMI (P=0.0001) and panniculus thickness (P=0.0444). HDL cholesterol concentration was inversely associated with BMI (P=0.0577), but not with panniculus thickness (P=0.2462). Glycohemoglobin was directly associated with BMI (P=0.0001), but not with panniculus thickness (P=0.1458). Smoking prevalence decreased with increasing BMI (P=0.0001), but not with panniculus thickness (P=0.6116), and smokers had a lower BMI than nonsmokers (nonsmokers, 25.5±0.2; smokers, 24.2±0.2 kg/m2; P=0.0001). Prevalence of hypertension did not differ between BMI<25 and 25
BMI
30 (P=0.3318), but was greater with BMI>30 than with BMI
30 (P=0.0408). Prevalence of hypertension was not associated with panniculus thickness (P=0.5384).
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Relation of Adiposity to Lesions of the RCA
The mean extent of lesions by BMI, panniculus thickness, and sex, adjusted for race and 5-year age group, is shown in Figure 1. In men, extent of fatty streaks increased with increasing BMI (P=0.0001) but was not affected by panniculus thickness (P=0.1734). There was a nonsignificant trend for extent of fatty streaks to increase with increasing BMI in women with a thick panniculus (P=0.1449), whereas there was no association in women with a thin panniculus (P=0.3454). Over all categories of BMI, women with a thick panniculus had an increased extent of fatty streaks (P=0.0225).
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Extent of raised lesions increased with increasing BMI in men regardless of panniculus thickness (P=0.0001). In men, there was no effect of panniculus thickness for BMI
30, whereas for BMI>30, those with a thick panniculus had more extensive raised lesions (P=0.0244). Neither BMI nor panniculus thickness was associated with extent of raised lesions in women.
There were no significant interactions of age with obesity (P>0.6981) or race with obesity (P>0.4617) for fatty streaks or raised lesions.
Topographic maps of lesion prevalence in the RCA of men (Figure 2) and women (Figure 3) show that adiposity did not change the pattern of lesion distribution. Adiposity increased the prevalence of both fatty streaks and raised lesions in men although it had little effect on prevalence of lesions in women. These relationships were similar to that shown by analyses of extent of intimal surface (Figure 1). Lesion prevalence was greatest in the first 2 to 3 cm of the RCA,13 and in men, the effects of adiposity on raised lesions in this region were evident even before age 25.
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Adiposity and RCA Lesions After Adjusting for Other Risk Factors
We compared the effects of adiposity with and without adjusting for the other risk factors in 1080 men having measurements for all risk factors. The mean extent of lesions in these men with and without adjusting for other risk factors is shown in Figure 4. Adjusting for the other risk factors diminished but did not eliminate the effects of adiposity (fatty streaks, P=0.0001; raised lesions, P=0.0642) and did not change the observed associations. The effects of adiposity on lesions, expressed as the ratio of mean extent of lesions relative to the mean extent in the category of BMI<25 kg/m2 and panniculus thickness
median, were reduced an average of 15% for fatty streaks and 12% for raised lesions due to adjustment for other risk factors.
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Adiposity and LAD Lesions
Preliminary analyses indicated no difference in prevalence of AHA grades or stenosis
40% between BMI 25 to 30 and BMI<25, but there were differences between BMI
30 and BMI>30. Table 3 shows odds ratios before and after adjusting for other risk factors. Men with BMI>30 had a greater prevalence of AHA grades 2 to 3, AHA grades 4 to 5, and stenosis
40% than those with BMI
30. There was no association of BMI with AHA grade or stenosis in women. Panniculus thickness was not associated with AHA grade or stenosis in men or women. Other risk factors did not account for the association of BMI with AHA grade or stenosis in men. 0
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| Discussion |
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Comparison With Other Studies
Alexander1 reviewed the predominantly negative results regarding the relationship of obesity to atherosclerosis in both autopsy and angiographic studies. Positive findings may be more frequent among the more recent studies, possibly because the increasing prevalence of obesity makes the association easier to detect. The association of obesity with other cardiovascular risk factors in youth is consistent with the results of many other studies.15,16
Mechanism of Effects of Obesity on Atherosclerosis and CHD
Obesity may affect atherosclerosis through unrecognized intervening variables.1 Emerging risk factors for CHD also associated with obesity are C-reactive protein in adults17 and children,18,19 insulin resistance,2022 and fibrinogen.23 As other physiological variables related to obesity are identified, they may explain a larger proportion of the association of obesity with atherosclerosis through plausible physiological mechanisms.
Lack of Association of Obesity With Atherosclerosis in Young Women
The association of obesity with clinical CHD in middle-aged and older women is firmly established, but the relative risks for women are slightly lower than those for men.24 However, we find only a weak and nonsignificant trend of an association of BMI with fatty streaks in the RCA of young women who also had a thick panniculus (Figure 1). Serum lipids, smoking, blood pressure, or elevated glycohemoglobin did not account for the differences in the effects of obesity in men compared with women.
At an equivalent BMI, women at all ages, even as children, have a larger percentage of body fat than men.25 However, men are more likely to have a central (visceral) distribution of fat than women,26 and most reports indicate that the adverse consequences of obesity are more strongly associated with central obesity2729 than non-central obesity.
Another possible explanation is the slower progression of atherosclerosis with age in young women compared with that in young men. Coronary raised lesions in young women lag behind those in young men by about 10 years independently of risk factor status, and obesity may accelerate the process in women only after 35 years of age. In older women, obesity may affect susceptibility to plaque rupture and thrombosis rather than affecting atherosclerosis.1
Fat Distribution
The potential importance of central obesity compared with peripheral obesity was not appreciated when this study began in 1985, and we do not have any of the usual measurements of this variable. Subcutaneous abdominal fat is associated with visceral fat (r
0.6),30 and therefore, the thickness of the panniculus may also provide information on visceral fat. Despite the numerous reports similar to those cited regarding the contribution of visceral obesity to CHD, 2 studies report that subcutaneous abdominal fat is more closely associated with insulin resistance than visceral fat;21,22 and 2 others find that BMI is a stronger predictor of other major risk factors than waist-hip ratio.31,32 Apparently, excess adipose tissue in any depot adversely affects health-related variables.
Implications
Our results show that obesity in adolescent and young adult men is associated with extent and severity of early atherosclerotic lesions. This conclusion is consistent with results of long-term follow-up studies, which show that obesity in youth not only predicts obesity in adulthood,20,33 but also predicts CHD morbidity and mortality.34,35 These results indicate that obesity in adolescents and young adults, through mechanisms yet to be identified, accelerates the progression of atherosclerosis decades before clinical manifestations appear. Obesity is an important modifiable contributor to coronary atherosclerosis, particularly in young adult men, and efforts to control childhood obesity are justified for the long-range prevention of CHD as well as other chronic diseases. The increasing prevalence of obesity among young persons4 emphasizes the need for obesity control efforts.
| Acknowledgments |
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Received December 27, 2001; revision received March 29, 2002; accepted March 29, 2002.
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S. S. Gidding, C. A. McMahan, H. C. McGill, L. A. Colangelo, P. J. Schreiner, O. D. Williams, and K. Liu Prediction of Coronary Artery Calcium in Young Adults Using the Pathobiological Determinants of Atherosclerosis in Youth (PDAY) Risk Score: The CARDIA Study Arch Intern Med, November 27, 2006; 166(21): 2341 - 2347. [Abstract] [Full Text] [PDF] |
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C. A. McMahan, S. S. Gidding, G. T. Malcom, R. E. Tracy, J. P. Strong, H. C. McGill Jr, and for the Pathobiological Determinants of Atheroscle Pathobiological Determinants of Atherosclerosis in Youth Risk Scores Are Associated With Early and Advanced Atherosclerosis Pediatrics, October 1, 2006; 118(4): 1447 - 1455. [Abstract] [Full Text] [PDF] |
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J. W Anderson, S. M Schwartz, J. Hauptman, M. Boldrin, M. Rossi, V. Bansal, and C. A Hale Low-Dose Orlistat Effects on Body Weight of Mildly to Moderately Overweight Individuals: A 16 Week, Double-Blind, Placebo-Controlled Trial Ann. Pharmacother., October 1, 2006; 40(10): 1717 - 1723. [Abstract] [Full Text] [PDF] |
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S. Zarich, C. Luciano, J. Hulford, and A. Abdullah Prevalence of metabolic syndrome in young patients with acute MI: does the Framingham Risk Score underestimate cardiovascular risk in this population? Diabetes and Vascular Disease Research, September 1, 2006; 3(2): 103 - 107. [Abstract] [PDF] |
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P. Poirier, T. D. Giles, G. A. Bray, Y. Hong, J. S. Stern, F. X. Pi-Sunyer, and R. H. Eckel Obesity and cardiovascular disease: pathophysiology, evaluation, and effect of weight loss. Arterioscler Thromb Vasc Biol, May 1, 2006; 26(5): 968 - 976. [Abstract] [Full Text] [PDF] |
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A. A. Meyer, G. Kundt, M. Steiner, P. Schuff-Werner, and W. Kienast Impaired Flow-Mediated Vasodilation, Carotid Artery Intima-Media Thickening, and Elevated Endothelial Plasma Markers in Obese Children: The Impact of Cardiovascular Risk Factors Pediatrics, May 1, 2006; 117(5): 1560 - 1567. [Abstract] [Full Text] [PDF] |
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A. Tedgui and Z. Mallat Cytokines in Atherosclerosis: Pathogenic and Regulatory Pathways Physiol Rev, April 1, 2006; 86(2): 515 - 581. [Abstract] [Full Text] [PDF] |
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P. Poirier, T. D. Giles, G. A. Bray, Y. Hong, J. S. Stern, F. X. Pi-Sunyer, and R. H. Eckel Obesity and Cardiovascular Disease: Pathophysiology, Evaluation, and Effect of Weight Loss: An Update of the 1997 American Heart Association Scientific Statement on Obesity and Heart Disease From the Obesity Committee of the Council on Nutrition, Physical Activity, and Metabolism Circulation, February 14, 2006; 113(6): 898 - 918. [Abstract] [Full Text] [PDF] |
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Z. Chen, G. Yang, M. Zhou, M. Smith, A. Offer, J. Ma, L. Wang, H. Pan, G. Whitlock, R. Collins, et al. Body mass index and mortality from ischaemic heart disease in a lean population: 10 year prospective study of 220 000 adult men Int. J. Epidemiol., February 1, 2006; 35(1): 141 - 150. [Abstract] [Full Text] [PDF] |
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L. A. Watson Commentary Clin Nurs Res, November 1, 2005; 14(4): 324 - 326. [PDF] |
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G. P. Van Guilder, G. L. Hoetzer, D. T. Smith, H. M. Irmiger, J. J. Greiner, B. L. Stauffer, and C. A. DeSouza Endothelial t-PA release is impaired in overweight and obese adults but can be improved with regular aerobic exercise Am J Physiol Endocrinol Metab, November 1, 2005; 289(5): E807 - E813. [Abstract] [Full Text] [PDF] |
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P.H. Whincup, J.A. Gilg, A.E. Donald, M. Katterhorn, C. Oliver, D.G. Cook, and J.E. Deanfield Arterial Distensibility in Adolescents: The Influence of Adiposity, the Metabolic Syndrome, and Classic Risk Factors Circulation, September 20, 2005; 112(12): 1789 - 1797. [Abstract] [Full Text] [PDF] |
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T. S. Hannon, G. Rao, and S. A. Arslanian Childhood Obesity and Type 2 Diabetes Mellitus Pediatrics, August 1, 2005; 116(2): 473 - 480. [Abstract] [Full Text] [PDF] |
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D. C. W. Lau, B. Dhillon, H. Yan, P. E. Szmitko, and S. Verma Adipokines: molecular links between obesity and atheroslcerosis Am J Physiol Heart Circ Physiol, May 1, 2005; 288(5): H2031 - H2041. [Abstract] [Full Text] [PDF] |
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C. A. McMahan, S. S. Gidding, Z. A. Fayad, A. W. Zieske, G. T. Malcom, R. E. Tracy, J. P. Strong, H. C. McGill Jr, and for the Pathobiological Determinants of Atheroscle Risk Scores Predict Atherosclerotic Lesions in Young People Arch Intern Med, April 25, 2005; 165(8): 883 - 890. [Abstract] [Full Text] [PDF] |
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S. Mora, L. R. Yanek, T. F. Moy, M. D. Fallin, L. C. Becker, and D. M. Becker Interaction of Body Mass Index and Framingham Risk Score in Predicting Incident Coronary Disease in Families Circulation, April 19, 2005; 111(15): 1871 - 1876. [Abstract] [Full Text] [PDF] |
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D. A. Lawlor and D. A. Leon Association of Body Mass Index and Obesity Measured in Early Childhood With Risk of Coronary Heart Disease and Stroke in Middle Age: Findings From the Aberdeen Children of the 1950s Prospective Cohort Study Circulation, April 19, 2005; 111(15): 1891 - 1896. [Abstract] [Full Text] [PDF] |
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G. de Simone, K. Wachtell, V. Palmieri, D. A. Hille, G. Beevers, B. Dahlof, U. de Faire, F. Fyhrquist, H. Ibsen, S. Julius, et al. Body Build and Risk of Cardiovascular Events in Hypertension and Left Ventricular Hypertrophy: The LIFE (Losartan Intervention For Endpoint reduction in hypertension) Study Circulation, April 19, 2005; 111(15): 1924 - 1931. [Abstract] [Full Text] [PDF] |
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P Friberg, A Allansdotter-Johnsson, A Ambring, R Ahl, H Arheden, J Framme, A Johansson, D Holmgren, H Wahlander, and S Marild Increased left ventricular mass in obese adolescents Eur. Heart J., June 1, 2004; 25(11): 987 - 992. [Abstract] [Full Text] [PDF] |
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N. Marx, D. Walcher, C. Raichle, M. Aleksic, H. Bach, M. Grub, V. Hombach, P. Libby, A. Zieske, S. Homma, et al. C-Peptide Colocalizes with Macrophages in Early Arteriosclerotic Lesions of Diabetic Subjects and Induces Monocyte Chemotaxis In Vitro Arterioscler Thromb Vasc Biol, March 1, 2004; 24(3): 540 - 545. [Abstract] [Full Text] |
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M. Gossl, N. M. Malyar, M. Rosol, P. E. Beighley, and E. L. Ritman Impact of coronary vasa vasorum functional structure on coronary vessel wall perfusion distribution Am J Physiol Heart Circ Physiol, November 1, 2003; 285(5): H2019 - H2026. [Abstract] [Full Text] [PDF] |
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L. B Tanko, Y. Z Bagger, P. Alexandersen, P. J Larsen, C. Christiansen, and for the PERF study group Central and peripheral fat mass have contrasting effect on the progression of aortic calcification in postmenopausal women Eur. Heart J., August 2, 2003; 24(16): 1531 - 1537. [Abstract] [Full Text] [PDF] |
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S. Cook, M. Weitzman, P. Auinger, M. Nguyen, and W. H. Dietz Prevalence of a Metabolic Syndrome Phenotype in Adolescents: Findings From the Third National Health and Nutrition Examination Survey, 1988-1994 Arch Pediatr Adolesc Med, August 1, 2003; 157(8): 821 - 827. [Abstract] [Full Text] [PDF] |
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L. L. Carr Summary of the Role of Statins in the Treatment of Dyslipidemia J Am Osteopath Assoc, July 1, 2003; 103(7_suppl_3): S1 - S3. [Full Text] [PDF] |
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J. Rehman, R. V. Considine, J. E. Bovenkerk, J. Li, C. A. Slavens, R. M. Jones, and K. L. March Obesity is associated with increased levels of circulating hepatocyte growth factor J. Am. Coll. Cardiol., April 16, 2003; 41(8): 1408 - 1413. [Abstract] [Full Text] [PDF] |
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M. I. Goran, G. D. C. Ball, and M. L. Cruz Obesity and Risk of Type 2 Diabetes and Cardiovascular Disease in Children and Adolescents J. Clin. Endocrinol. Metab., April 1, 2003; 88(4): 1417 - 1427. [Abstract] [Full Text] [PDF] |
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L. B. Tanko, Y. Z. Bagger, P. Alexandersen, P. J. Larsen, and C. Christiansen Peripheral Adiposity Exhibits an Independent Dominant Antiatherogenic Effect in Elderly Women Circulation, April 1, 2003; 107(12): 1626 - 1631. [Abstract] [Full Text] [PDF] |
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K. B. Keller and L. Lemberg Obesity and the Metabolic Syndrome Am. J. Crit. Care., March 1, 2003; 12(2): 167 - 170. [Full Text] [PDF] |
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P. Greenland, S. S Gidding, and R. P Tracy Commentary: Lifelong prevention of atherosclerosis: the critical importance of major risk factor exposures Int. J. Epidemiol., December 1, 2002; 31(6): 1129 - 1134. [Full Text] |
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Obesity Is Linked with Accelerated Atherosclerosis in Young Men Journal Watch (General), July 26, 2002; 2002(726): 4 - 4. [Full Text] |
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S. M. Grundy Obesity, Metabolic Syndrome, and Coronary Atherosclerosis Circulation, June 11, 2002; 105(23): 2696 - 2698. [Full Text] [PDF] |
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