doi: 10.1161/hc4601.099486
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(Circulation. 2001;104:2815.)
© 2001 American Heart Association, Inc.
Clinical Investigation and Reports |
Carotid Intimal-Medial Thickness Is Related to Cardiovascular Risk Factors Measured From Childhood Through Middle Age
The Muscatine Study
From the Division of Cerebrovascular Diseases, Department of Neurology (P.H.D.), the Department of Biostatistics (J.D.D.), the Division of Pediatric Cardiology, Department of Pediatrics (R.M.L.), and the Department of Epidemiology (R.M.L.), University of Iowa, Iowa City, Iowa; and the Department of Neurology, Wake Forest University, Winston-Salem, NC (W.A.R.).
Correspondence to Patricia H. Davis, MD, Department of Neurology, University of Iowa College of Medicine, 200 Hawkins Drive, Iowa City, IA 52242. E-mail pat-davis{at}uiowa.edu
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Abstract |
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Background— Higher carotid intimal-medial thickness (IMT) is associated with cardiovascular risk factors and is predictive of coronary artery disease and stroke in older adults. Carotid IMT was measured in young and middle-aged adults to determine its relationship with risk factors measured (1) in childhood, (2) currently, and (3) as a "load" from childhood to adulthood.
Methods and Results— Carotid ultrasound studies were performed in 346 men and 379 women aged 33 to 42 years who were representative of a cohort followed since childhood and who live in Muscatine, Iowa. The mean of the measurements of maximal carotid IMT at 12 locations was determined for each subject. A medical questionnaire was completed, and measurements of anthropometric characteristics and risk factors were obtained. The mean maximum carotid IMT was 0.79±0.12 mm for men and 0.72±0.10 mm for women. On the basis of multivariable analysis, the significant current predictors of IMT were age and LDL cholesterol in both sexes and diastolic blood pressure in women. Total cholesterol was a significant childhood predictor in both sexes, while childhood body mass index was significant only in women. For men, LDL cholesterol, HDL cholesterol, and diastolic blood pressure were predictive of carotid IMT in a risk factor load model, whereas in women, LDL cholesterol, body mass index, and triglycerides were predictive.
Conclusions— Higher carotid IMT in young and middle-aged adults is associated with childhood and current cardiovascular risk factors, as well as risk factor load.
Key Words: atherosclerosis • epidemiology • carotid arteries
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Introduction |
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In children, adolescents, and young adults, information about risk factors for the development of the early atherosclerotic process is derived mainly from autopsy studies.1 In older adults, higher carotid intimal-medial thickness (IMT) is linked to the atherosclerotic process by the association of carotid IMT with known cardiovascular risk factors2 and prevalent and incident coronary artery disease and stroke.3–6 However, identification of young and middle-aged adults with premature atherosclerosis using noninvasive methods, such as measurement of carotid IMT, long before they develop clinical events would identify those at highest risk. In younger adults, the predictiveness of cardiovascular risk factors for clinical events in later life has not yet been established, but the association of these risk factors with carotid IMT would lend support to measuring risk factors at a young age.
A cohort of children in Muscatine, Iowa, has been followed since 1971. Their risk factors were measured in childhood (aged 8 to 18 years) and young adulthood (aged 20 to 33 years, and again at 29 to 37 years). This cohort has now reached the age of 33 to 42 years. Using B-mode ultrasound to noninvasively measure carotid artery atherosclerosis in a sample of this cohort, we previously demonstrated an association between higher carotid IMT and the presence of coronary artery calcification (CAC), another measure of subclinical atherosclerosis.7 In the present study, our objective was to determine the relationship of carotid IMT with childhood and current cardiovascular risk factors and a risk factor "load" from childhood to adulthood in this cohort.
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Methods |
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Population
Between 1971 and 1981, school children aged 8 to 18 years in Muscatine, Iowa, underwent biennial examinations. A total of 14 066 children underwent 32 636 examinations.8,9 Between 1981 and 1991, 2446 participants (67% of those eligible) who were then aged 20 to 34 years were examined again. From 1992 to 1996, a subset of this cohort (769 individuals) had a repeat examination with electron-beam computed tomography to measure CAC.10 Between 1996 and 1999, we re-examined these individuals, who had then reached the age of 33 to 42 years. Subjects were eligible to be included if they had previously participated in at least one childhood survey, one young adult survey, and the CAC study. There were 346 men and 379 women, which included 94% of those targeted for the study. Childhood risk factor levels (adjusted for age, sex, and calendar year) of these 725 participants did not differ significantly from the entire childhood cohort with respect to height, weight, blood pressure, triceps skin fold, total cholesterol, or triglycerides for either sex or for body mass index (weight divided by height squared; BMI) for women. For men, the childhood BMI was 0.09 SDs higher in the participants compared with the rest of the original cohort (P<0.05). The protocol was approved by the University of Iowa Institutional Review Board, and informed consent was obtained from all subjects. Subjects were compensated for participating.
Risk Factor Assessment
After a 12-hour fast, we measured, in each subject, total cholesterol, HDL cholesterol, triglycerides, lipoprotein(a), homocysteine, glucose, and insulin, and we calculated LDL cholesterol. If triglycerides were 
400 mg/dL, the LDL cholesterol could not be calculated, and these were treated as missing values. Height, weight, triceps skin fold, hip circumference, and waist circumference were recorded. Three random-zero blood pressure measurements were obtained after a 5-minute seated rest. Participants completed a medical and personal history questionnaire.
Carotid Ultrasound Studies
Carotid ultrasound studies were performed by a single technician. The protocol for measuring carotid IMT was the same as that used in the Asymptomatic Carotid Artery Plaque Study (ACAPS).11 For each subject, the maximum carotid IMT was imaged for the near and far wall of each common carotid artery (CCA), carotid bifurcation, and internal carotid artery. Scans were read at a central reading center (AUTREC, Inc), which had demonstrated high inter-reader reliability during the ACAPS trial.11 A 4.4% random sample underwent repeat carotid ultrasound studies during a second visit to assess intrasubject reliability.
Statistical Analyses
The mean of the maximum carotid IMT measured at the 12 locations (3 sitesx2 sidesx2 walls) was the primary outcome of interest. For subjects who had missing data, the mean of their non-missing walls was used. Because the walls of the internal carotid artery are more often missing and tend to be thinner, this method may lead to overestimating the IMT. To address this, we compared our estimates with those from a random effects model, using terms for subject and wall location.12
Childhood risk factors included BMI, triceps skin fold, systolic blood pressure, diastolic blood pressure (DBP), cholesterol, and triglycerides determined at the last childhood examination. These results were standardized by age, sex, and year of the childhood survey to produce a Z-score. A similar method was used to standardize the young adult measurements, which included waist-hip ratio, LDL cholesterol, and HDL cholesterol, in addition to those measured in childhood and the results from current risk factors. For current risk factors, we repeated the analysis after excluding participants taking lipid-lowering medication from the lipid analyses, those taking antihypertensives from the blood pressure analyses, and those taking hypoglycemic medications from the insulin and glucose determinations, with the same results.
To integrate the longitudinal risk factor data collected since childhood for each individual, we conducted an analysis based on a risk factor load, which was a time-weighted average for each risk factor. For men, the mean number of observations used to calculate risk factor load was 5.8; for women, the mean number was 5.7. Information about pack-years of smoking was included as a measure of risk load.
For each sex, the association between carotid IMT and risk factors at various ages and the risk factor load was tested using Spearman rank correlation coefficients. For multivariable associations, we dichotomized IMT into values above or below the upper quartile and used stepwise logistic regression after adjusting for age. This was done to define those with the highest levels of carotid atherosclerosis. To quantify the predictiveness of the logistic regression models, the area under the receiver operator characteristic curve was calculated.
To further investigate the relationship of childhood risk factors to young adult carotid IMT, instead of using the last childhood measurement of risk factors performed at a mean age of 15.2 years in boys and 15.5 years in girls, we repeated the analysis using only measurements performed at age 8 to 11 years.
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Results |
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The means of the 12 maximum carotid IMT measurements were 0.79±0.12 mm for men and 0.72±0.10 mm for women (P<0.001). Most subjects (85.1%) had
10 walls measured, and nearly all (98.5%) had 6 walls measured. The completeness of the data measured according to site was as follows: near wall of internal carotid artery, 74.0%; far wall of internal carotid artery, 88.0%; near wall of carotid bifurcation, 92.7%; far wall of carotid bifurcation, 92.8%; near wall of CCA, 98.9%; and far wall of CCA, 99.7%. Our method of using the available IMT measurements to calculate the mean IMT gave estimates similar to those using the random effects model: they were only 0.6% higher on average. For the 4.4% sample of subjects with a second ultrasound done a mean of 107 days later, the within-subject reliability was 76%, with a mean absolute value of the within-subject deviation of 0.058 mm. In Tables 1 and 2, the results of the univariate analysis of risk factors for men and women, respectively, are shown according to the time of measurement. In men, the only childhood risk factor associated with current IMT was cholesterol. In women, childhood risk factors associated with current IMT were BMI, triceps skin fold, cholesterol, systolic blood pressure, DBP, and triglycerides. Diabetes mellitus was not a significant current risk factor, but the prevalence in this cohort was low (1.2% in men and 6.4% in women). Smoking was also not a significant risk factor, with a prevalence of current smoking of 28.2% in women and 35.4% in men, with a mean number of pack-years of 5.7±9.3 in women and 9.8±12.1 in men. Although some risk factors were significant for only one sex, further analysis showed that the DBP load correlation was the only one that was significantly different for men and women.
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In Tables 3 and 4, the multivariable models using childhood risk factors, currently measured risk factors, and risk factor loads are shown for men and women, respectively. For both sexes, LDL cholesterol was a significant current risk factor, and for women, DBP was also significant. For both sexes, cholesterol was a significant childhood risk factor, and childhood BMI was also significant for women. For men, the load model included LDL cholesterol, HDL cholesterol, and DBP. For women, the load model included LDL cholesterol, BMI, and triglycerides. In men, the area under the receiver operator characteristic curve was 0.629 for the childhood risk factors, 0.653 for young adulthood, 0.687 for current, and 0.713 for load; in women, the respective areas were 0.650, 0.653, 0.669, and 0.689. There was no significant difference in the area under the receiver operator characteristic curve among the 4 models within either sex.13
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In the multivariable analysis using only measurements performed at age 8 to 11 years, total cholesterol was a significant risk factor in men, with an odds ratio of 1.47 (95% confidence interval: 1.02, 2.13), and in women, with an odds ratio of 1.71 (95% confidence interval: 1.16, 2.50). The Figure shows the median of the mean carotid IMTs according to tertile of the last childhood measurement of cholesterol and sex, thus demonstrating the significant association.
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Discussion |
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Measurement of Carotid IMT and Atherosclerosis
In older adults, measuring carotid IMT has gained acceptance as a noninvasive, inexpensive method to assess the extent of atherosclerosis.14 Several pieces of evidence support the validity of this. Measuring carotid IMT with ultrasonography correlates well with pathological measurements15 and is reproducible.11 Increased carotid IMT is significantly related to known cardiovascular risk factors2 and to carotid plaque,16 a more advanced atherosclerotic lesion. Finally, carotid IMT is linked to prevalent stroke, coronary artery disease, and peripheral vascular disease, as well as incident myocardial infarction and stroke, and this association persists after adjustment for known cardiovascular risk factors.3–6 However, there are limited data concerning carotid IMT in young and middle-aged adults.17,18
Current Risk Factors
In this study of young and middle-aged adults, LDL cholesterol was the strongest current predictor of higher carotid IMT in men, and no other risk factors remained significant after adjusting for LDL cholesterol and age. In women, both current LDL cholesterol and DBP remained significant after adjusting for age and each other. In prior smaller studies of subjects in this age group, significant risk factors for higher carotid IMT included age, systolic blood pressure, DBP, and pack-years of smoking, whereas HDL cholesterol and grams of alcohol consumed were significant protective factors.17,18 Case-control studies of children and young adults demonstrate that familial hypercholesterolemia19–21 and borderline hypertension22 are associated with greater IMT. Young adults with diabetes23 have also shown higher carotid IMT than controls. In the Muscatine cohort, the lack of association of IMT with diabetes and smoking pack-years may be due to a lack of a sufficient number of years of exposure. These risk factors may become of increasing importance as the cohort ages.
Several risk factors were not associated with carotid IMT in the present study, although studies in older adults have shown an association. Elevated plasma homocysteine has been shown to be a significant risk factor for higher carotid IMT.24 In the present study, plasma homocysteine was not a significant risk factor and, in the same cohort, Mahoney et al10 did not find an association between plasma homocysteine and CAC. These observations suggest that elevated homocysteine levels may not affect carotid IMT at a younger age. In the present study, fasting glucose was not associated with carotid IMT, although fasting insulin was significantly associated with carotid IMT in men by univariate analysis. In an older cohort, an association between carotid IMT and fasting insulin and glucose was seen.25 Lipoprotein(a) has also been associated with increased carotid IMT26 but, in the Muscatine cohort, no association was found. Although these risk factors are not associated with carotid IMT in young and middle-aged adults, they may still be important factors in coronary atherosclerosis and thrombosis.
In the Muscatine cohort, cardiovascular risk factors were significantly associated with carotid IMT, even at a young age. In a subset of this cohort, we demonstrated that greater carotid IMT is significantly correlated with the presence of CAC.7 These observations support the assumption that higher carotid IMT also reflects the atherosclerotic process in young and middle-aged adults.
Method of Measuring IMT
Carotid IMT has been measured in both far walls of the CCA alone or at multiple sites. We used the average of 12 measurements of maximal IMT in the present study because we predicted more stable results than when using only 2 measurements, and we obtained stronger relationships with risk factors. We recalculated the 38 Spearman coefficients between current risk factors and the average of the far walls of the CCA (CCA method). Comparing our results (Tables 1 and 2) with those obtained from the CCA method, we found more correlations >0.20 (9 versus 0), more correlations significant at P<0.05 (26 versus 19), and more correlations significant at P<0.001 (14 versus 1). In the Cardiovascular Health Study, risk factors accounted for 25% of the variability for a composite of CCA and internal carotid artery IMT but only 17% of the variability in the CCA IMT.27
Childhood Risk Factors and Risk Factor Load
We demonstrated that childhood total cholesterol, measured as early as aged 8 to 11 years, is a significant risk factor for carotid IMT measured in young adulthood. These findings support the recommendations of the National Cholesterol Education Program to screen children with a family history of elevated cholesterol or premature heart disease and to intervene in childhood.28 In a prior study of this cohort, Mahoney et al10 demonstrated that childhood BMI also significantly correlated with the presence of CAC measured in young men and women. In the present study, childhood BMI was only associated with carotid IMT in women.
In the Muscatine cohort, risk factor load measured over time from childhood to adulthood did not contribute additional predictive value for higher carotid IMT compared with contemporaneous risk factors. We anticipated that such averaging would decrease measurement error to give a more stable measure of risk factor status, giving the load a higher correlation with mean IMT. However, a single current risk factor measurement was generally just as informative as the load. This may be due to the consistency of rank order of risk factors from childhood to adulthood that was previously demonstrated in this cohort.29 In a British study, lifestyle and biological risk markers measured in adulthood were greater determinants of carotid IMT than early life factors.30 In the older Framingham cohort, time-integrated measures of risk factors were more associated with carotid stenosis than contemporaneously measured risk factors.31
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Summary |
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In the Muscatine cohort, who were examined over the age range of 8 to 42 years, childhood risk factors, including total cholesterol for both sexes and BMI only for women, predicted carotid IMT. Both childhood obesity and cholesterol levels have been shown to track into young adulthood.29,32 Contemporaneous LDL cholesterol in both sexes and DBP in women are independent predictors of carotid IMT. A risk factor "load" model included LDL cholesterol in both sexes, HDL cholesterol and DBP in men, and triglycerides and BMI in women. Risk factors measured as early as ages 8 to 11 years are predictive of adult carotid IMT. In trials testing interventions to retard the atherosclerotic process in late adolescence and young adulthood, measures of carotid IMT may be considered surrogate markers of the degree of atherosclerotic process.
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Acknowledgments |
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Funding for this project came from NIH-NHLBI grant HL54730 and grant RR00059 from the General Clinical Research Centers Program, National Center for Research Resources, NIH.
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Footnotes |
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Presented in part at the 71st Scientific Sessions of the American Heart Association, Dallas, Tex, November, 1998, and published in abstract form (Circulation. 1998;98[suppl I]:I-516).
Received June 28, 2001; revision received September 17, 2001; accepted September 18, 2001.
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References |
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M. G. Frontini, S. R. Srinivasan, J. Xu, R. Tang, M. G. Bond, and G. S. Berenson Usefulness of Childhood Non-High Density Lipoprotein Cholesterol Levels Versus Other Lipoprotein Measures in Predicting Adult Subclinical Atherosclerosis: The Bogalusa Heart Study Pediatrics, May 1, 2008; 121(5): 924 - 929. [Abstract] [Full Text] [PDF]
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M. Juonala, J. S.A. Viikari, T. Ronnemaa, J. Marniemi, A. Jula, B.-M. Loo, and O. T. Raitakari Associations of Dyslipidemias From Childhood to Adulthood With Carotid Intima-Media Thickness, Elasticity, and Brachial Flow-Mediated Dilatation in Adulthood: The Cardiovascular Risk in Young Finns Study Arterioscler. Thromb. Vasc. Biol., May 1, 2008; 28(5): 1012 - 1017. [Abstract] [Full Text] [PDF]
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H. C. McGill Jr, C. A. McMahan, and S. S. Gidding Preventing Heart Disease in the 21st Century: Implications of the Pathobiological Determinants of Atherosclerosis in Youth (PDAY) Study Circulation, March 4, 2008; 117(9): 1216 - 1227. [Full Text] [PDF]
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S. Stern Are We Getting Nearer to Screening for Atherosclerosis? Circulation, January 1, 2008; 117(1): 122 - 126. [Full Text] [PDF]
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C. G. Magnussen, O. T. Raitakari, R. Thomson, M. Juonala, D. A. Patel, J. S.A. Viikari, J. Marniemi, S. R. Srinivasan, G. S. Berenson, T. Dwyer, et al. Utility of Currently Recommended Pediatric Dyslipidemia Classifications in Predicting Dyslipidemia in Adulthood: Evidence From the Childhood Determinants of Adult Health (CDAH) Study, Cardiovascular Risk in Young Finns Study, and Bogalusa Heart Study Circulation, January 1, 2008; 117(1): 32 - 42. [Abstract] [Full Text] [PDF]
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R. Femia, M. Kozakova, M. Nannipieri, C. Gonzales-Villalpando, M. P. Stern, S. M. Haffner, and E. Ferrannini Carotid Intima-Media Thickness in Confirmed Prehypertensive Subjects: Predictors and Progression Arterioscler. Thromb. Vasc. Biol., October 1, 2007; 27(10): 2244 - 2249. [Abstract] [Full Text] [PDF]
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J. A. Morrison, L. A. Friedman, and C. Gray-McGuire Metabolic Syndrome in Childhood Predicts Adult Cardiovascular Disease 25 Years Later: The Princeton Lipid Research Clinics Follow-up Study Pediatrics, August 1, 2007; 120(2): 340 - 345. [Abstract] [Full Text] [PDF]
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L. L. Hayman, J. C. Meininger, S. R. Daniels, B. W. McCrindle, L. Helden, J. Ross, B. A. Dennison, J. Steinberger, and C. L. Williams Primary Prevention of Cardiovascular Disease in Nursing Practice: Focus on Children and Youth: A Scientific Statement From the American Heart Association Committee on Atherosclerosis, Hypertension, and Obesity in Youth of the Council on Cardiovascular Disease in the Young, Council on Cardiovascular Nursing, Council on Epidemiology and Prevention, and Council on Nutrition, Physical Activity, and Metabolism Circulation, July 17, 2007; 116(3): 344 - 357. [Full Text] [PDF]
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E. M. Haney, L. H. Huffman, C. Bougatsos, M. Freeman, R. D. Steiner, and H. D. Nelson Screening and Treatment for Lipid Disorders in Children and Adolescents: Systematic Evidence Review for the US Preventive Services Task Force Pediatrics, July 1, 2007; 120(1): e189 - e214. [Abstract] [Full Text] [PDF]
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K. M. Modesto, A. Dispenzieri, M. Gertz, S. A. Cauduro, B. K. Khandheria, J. B. Seward, R. Kyle, C. M. Wood, K. R. Bailey, A. J. Tajik, et al. Vascular abnormalities in primary amyloidosis Eur. Heart J., April 12, 2007; (2007) ehm066v1. [Abstract] [Full Text] [PDF]
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B. W. McCrindle, E. M. Urbina, B. A. Dennison, M. S. Jacobson, J. Steinberger, A. P. Rocchini, L. L. Hayman, and S. R. Daniels Drug Therapy of High-Risk Lipid Abnormalities in Children and Adolescents: A Scientific Statement From the American Heart Association Atherosclerosis, Hypertension, and Obesity in Youth Committee, Council of Cardiovascular Disease in the Young, With the Council on Cardiovascular Nursing Circulation, April 10, 2007; 115(14): 1948 - 1967. [Abstract] [Full Text] [PDF]
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R.-E. W. Kavey, V. Allada, S. R. Daniels, L. L. Hayman, B. W. McCrindle, J. W. Newburger, R. S. Parekh, and J. Steinberger Cardiovascular Risk Reduction in High-Risk Pediatric Patients: A Scientific Statement From the American Heart Association Expert Panel on Population and Prevention Science; the Councils on Cardiovascular Disease in the Young, Epidemiology and Prevention, Nutrition, Physical Activity and Metabolism, High Blood Pressure Research, Cardiovascular Nursing, and the Kidney in Heart Disease; and the Interdisciplinary Working Group on Quality of Care and Outcomes Research: Endorsed by the American Academy of Pediatrics Circulation, December 12, 2006; 114(24): 2710 - 2738. [Abstract] [Full Text] [PDF]
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C. Napoli, L. O. Lerman, F. de Nigris, M. Gossl, M. L. Balestrieri, and A. Lerman Rethinking Primary Prevention of Atherosclerosis-Related Diseases Circulation, December 5, 2006; 114(23): 2517 - 2527. [Full Text] [PDF]
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R. Wunsch, G. de Sousa, A. M. Toschke, and T. Reinehr Intima-Media Thickness in Obese Children Before and After Weight Loss Pediatrics, December 1, 2006; 118(6): 2334 - 2340. [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. A. Groner, M. Joshi, and J. A. Bauer Pediatric Precursors of Adult Cardiovascular Disease: Noninvasive Assessment of Early Vascular Changes in Children and Adolescents Pediatrics, October 1, 2006; 118(4): 1683 - 1691. [Abstract] [Full Text] [PDF]
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M. Juonala, J. S.A. Viikari, T. Ronnemaa, H. Helenius, L. Taittonen, and O. T. Raitakari Elevated Blood Pressure in Adolescent Boys Predicts Endothelial Dysfunction: The Cardiovascular Risk in Young Finns Study Hypertension, September 1, 2006; 48(3): 424 - 430. [Abstract] [Full Text] [PDF]
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S. J. Nicholls, E. M. Tuzcu, T. Crowe, I. Sipahi, P. Schoenhagen, S. Kapadia, S. L. Hazen, C.-C. Wun, M. Norton, F. Ntanios, et al. Relationship Between Cardiovascular Risk Factors and Atherosclerotic Disease Burden Measured by Intravascular Ultrasound J. Am. Coll. Cardiol., May 16, 2006; 47(10): 1967 - 1975. [Abstract] [Full Text] [PDF]
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J. Lo, S. E. Dolan, J. R. Kanter, L. C. Hemphill, J. M. Connelly, R. S. Lees, and S. K. Grinspoon Effects of Obesity, Body Composition, and Adiponectin on Carotid Intima-Media Thickness in Healthy Women J. Clin. Endocrinol. Metab., May 1, 2006; 91(5): 1677 - 1682. [Abstract] [Full Text] [PDF]
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O. T. Raitakari, T. Ronnemaa, M. J. Jarvisalo, T. Kaitosaari, I. Volanen, K. Kallio, H. Lagstrom, E. Jokinen, H. Niinikoski, J. S.A. Viikari, et al. Endothelial Function in Healthy 11-Year-Old Children After Dietary Intervention With Onset in Infancy: The Special Turku Coronary Risk Factor Intervention Project for Children (STRIP) Circulation, December 13, 2005; 112(24): 3786 - 3794. [Abstract] [Full Text] [PDF]
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D. E. Williams, B. L. Cadwell, Y. J. Cheng, C. C. Cowie, E. W. Gregg, L. S. Geiss, M. M. Engelgau, K. M. V. Narayan, and G. Imperatore Prevalence of Impaired Fasting Glucose and Its Relationship With Cardiovascular Disease Risk Factors in US Adolescents, 1999-2000 Pediatrics, November 1, 2005; 116(5): 1122 - 1126. [Abstract] [Full Text] [PDF]
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R Wunsch, G de Sousa, and T Reinehr Intima-media thickness in obesity: relation to hypertension and dyslipidaemia Arch. Dis. Child., October 1, 2005; 90(10): 1097 - 1097. [Full Text] [PDF]
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W. S. Tzou, P. S. Douglas, S. R. Srinivasan, M. G. Bond, R. Tang, W. Chen, G. S. Berenson, and J. H. Stein Increased Subclinical Atherosclerosis in Young Adults With Metabolic Syndrome: The Bogalusa Heart Study J. Am. Coll. Cardiol., August 2, 2005; 46(3): 457 - 463. [Abstract] [Full Text] [PDF]
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R. T. Yan, T. J. Anderson, F. Charbonneau, L. Title, S. Verma, E. Lonn, and on behalf of the FATE Investigators Relationship Between Carotid Artery Intima-Media Thickness and Brachial Artery Flow-Mediated Dilation in Middle-Aged Healthy Men J. Am. Coll. Cardiol., June 21, 2005; 45(12): 1980 - 1986. [Abstract] [Full Text] [PDF]
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W. S. Tzou, P. S. Douglas, S. R. Srinivasan, W. Chen, G. Berenson, and J. H. Stein Advanced Lipoprotein Testing Does Not Improve Identification of Subclinical Atherosclerosis in Young Adults: The Bogalusa Heart Study Ann Intern Med, May 3, 2005; 142(9): 742 - 750. [Abstract] [Full Text] [PDF]
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A. Colao, C. Di Somma, F. Rota, S. Di Maio, M. Salerno, A. Klain, S. Spiezia, and G. Lombardi Common Carotid Intima-Media Thickness in Growth Hormone (GH)-Deficient Adolescents: A Prospective Study after GH Withdrawal and Restarting GH Replacement J. Clin. Endocrinol. Metab., May 1, 2005; 90(5): 2659 - 2665. [Abstract] [Full Text] [PDF]
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A. Vryonidou, A. Papatheodorou, A. Tavridou, T. Terzi, V. Loi, I.-A. Vatalas, N. Batakis, C. Phenekos, and A. Dionyssiou-Asteriou Association of Hyperandrogenemic and Metabolic Phenotype with Carotid Intima-Media Thickness in Young Women with Polycystic Ovary Syndrome J. Clin. Endocrinol. Metab., May 1, 2005; 90(5): 2740 - 2746. [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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A. Colao, C. Di Somma, F. Rota, R. Pivonello, M. C. Savanelli, S. Spiezia, and G. Lombardi Short-Term Effects of Growth Hormone (GH) Treatment or Deprivation on Cardiovascular Risk Parameters and Intima-Media Thickness at Carotid Arteries in Patients with Severe GH Deficiency J. Clin. Endocrinol. Metab., April 1, 2005; 90(4): 2056 - 2062. [Abstract] [Full Text] [PDF]
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T. H. Jafar, M. Islam, N. Poulter, J. Hatcher, C. H. Schmid, A. S. Levey, and N. Chaturvedi Children in South Asia Have Higher Body Mass-Adjusted Blood Pressure Levels Than White Children in the United States: A Comparative Study Circulation, March 15, 2005; 111(10): 1291 - 1297. [Abstract] [Full Text] [PDF]
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M. Juonala, J. S.A. Viikari, M. Kahonen, L. Taittonen, T. Ronnemaa, T. Laitinen, N. Maki-Torkko, V. Mikkila, L. Rasanen, H. K. Akerblom, et al. Geographic Origin as a Determinant of Carotid Artery Intima-Media Thickness and Brachial Artery Flow-Mediated Dilation: The Cardiovascular Risk in Young Finns Study Arterioscler. Thromb. Vasc. Biol., February 1, 2005; 25(2): 392 - 398. [Abstract] [Full Text] [PDF]
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M. J. Haller, M. Samyn, W. W. Nichols, T. Brusko, C. Wasserfall, R. F. Schwartz, M. Atkinson, J. J. Shuster, G. L. Pierce, and J. H. Silverstein Radial Artery Tonometry Demonstrates Arterial Stiffness in Children With Type 1 Diabetes Diabetes Care, December 1, 2004; 27(12): 2911 - 2917. [Abstract] [Full Text] [PDF]
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X. Li, S. Li, E. Ulusoy, W. Chen, S. R. Srinivasan, and G. S. Berenson Childhood Adiposity as a Predictor of Cardiac Mass in Adulthood: The Bogalusa Heart Study Circulation, November 30, 2004; 110(22): 3488 - 3492. [Abstract] [Full Text] [PDF]
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A. T. Hirsch and A. R. Folsom The Continuum of Risk: Vascular Pathophysiology, Function, and Structure Circulation, November 2, 2004; 110(18): 2774 - 2777. [Full Text] [PDF]
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M. Juonala, J. S.A. Viikari, T. Laitinen, J. Marniemi, H. Helenius, T. Ronnemaa, and O. T. Raitakari Interrelations Between Brachial Endothelial Function and Carotid Intima-Media Thickness in Young Adults: The Cardiovascular Risk in Young Finns Study Circulation, November 2, 2004; 110(18): 2918 - 2923. [Abstract] [Full Text] [PDF]
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A Kablak-Ziembicka, W Tracz, T Przewlocki, P Pieniazek, A Sokolowski, and M Konieczynska Association of increased carotid intima-media thickness with the extent of coronary artery disease Heart, November 1, 2004; 90(11): 1286 - 1290. [Abstract] [Full Text] [PDF]
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J. Miller, A. Rosenbloom, and J. Silverstein Childhood Obesity J. Clin. Endocrinol. Metab., September 1, 2004; 89(9): 4211 - 4218. [Full Text] [PDF]
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National High Blood Pressure Education Program Wor The Fourth Report on the Diagnosis, Evaluation, and Treatment of High Blood Pressure in Children and Adolescents Pediatrics, August 1, 2004; 114(2/S2): 555 - 576. [Full Text] [PDF]
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G. B. J. Mancini, B. Dahlof, and J. Diez Surrogate Markers for Cardiovascular Disease: Structural Markers Circulation, June 29, 2004; 109(25_suppl_1): IV-22 - IV-30. [Full Text] [PDF]
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S. Ten and N. Maclaren Insulin Resistance Syndrome in Children J. Clin. Endocrinol. Metab., June 1, 2004; 89(6): 2526 - 2539. [Abstract] [Full Text] [PDF]
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J. P.J. Halcox and J. E. Deanfield Beyond the Laboratory: Clinical Implications for Statin Pleiotropy Circulation, June 1, 2004; 109(21_suppl_1): II-42 - II-48. [Abstract] [Full Text] [PDF]
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J.A. Paramo, J. Orbe, O. Beloqui, A. Benito, I. Colina, E. Martinez-Vila, and J. Diez Prothrombin Fragment 1+2 Is Associated With Carotid Intima-Media Thickness in Subjects Free of Clinical Cardiovascular Disease Stroke, May 1, 2004; 35(5): 1085 - 1089. [Abstract] [Full Text] [PDF]
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S. Li, W. Chen, S. R. Srinivasan, and G. S. Berenson Childhood Blood Pressure as a Predictor of Arterial Stiffness in Young Adults: The Bogalusa Heart Study Hypertension, March 1, 2004; 43(3): 541 - 546. [Abstract] [Full Text] [PDF]
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J. K. Olijhoek, Y. van der Graaf, J.-D. Banga, A. Algra, T. J. Rabelink, F. L. J. Visseren, and for the SMART Study Group The Metabolic Syndrome is associated with advanced vascular damage in patients with coronary heart disease, stroke, peripheral arterial disease or abdominal aortic aneurysm Eur. Heart J., February 2, 2004; 25(4): 342 - 348. [Abstract] [Full Text] [PDF]
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V. A. Korshunov and B. C. Berk Flow-Induced Vascular Remodeling in the Mouse: A Model for Carotid Intima-Media Thickening Arterioscler. Thromb. Vasc. Biol., December 1, 2003; 23(12): 2185 - 2191. [Abstract] [Full Text] [PDF]
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T. P. Singh, H. Groehn, and A. Kazmers Vascular function and carotid intimal-medial thickness in children with insulin-dependent diabetes mellitus J. Am. Coll. Cardiol., February 19, 2003; 41(4): 661 - 665. [Abstract] [Full Text] [PDF]
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M. T. Magyar, Z. Szikszai, J. Balla, A. Valikovics, J. Kappelmayer, S. Imre, G. Balla, V. Jeney, L. Csiba, and D. Bereczki Early-Onset Carotid Atherosclerosis Is Associated With Increased Intima-Media Thickness and Elevated Serum Levels of Inflammatory Markers Stroke, January 1, 2003; 34(1): 58 - 63. [Abstract] [Full Text] [PDF]
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 S. L. Miller, D. B. DiRienzo, and G. D. Miller New Frontiers in Weight Management J. Am. Coll. Nutr., April 1, 2002; 21(2): 131S - 133. [Full Text] [PDF]
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