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PubMed1994

Magnetic resonance abnormalities and cardiovascular disease in older adults. The Cardiovascular Health Study.

BACKGROUND AND PURPOSE: Cerebral magnetic resonance imaging often detects abnormalities whose significance is unknown. The prevalence and correlates of findings such as ventricular enlargement, sulcal widening, and increased white matter signal intensity were examined in 303 men and women aged 65 to 95 years participating in a multicenter study of cardiovascular disease. METHODS: Cerebral magnetic resonance imaging was performed and interpreted according to a standard protocol, and findings were correlated with measures of cardiovascular disease and its risk factors. RESULTS: Measures of cerebral atrophy increased with age and were greater in men than in women (each P < .01). Ventricular enlargement and sulcal widening were associated with prior stroke, hypertension, diabetes, and white race (each P < .03). Extent of white matter hyperintensity was associated with age, prior stroke, hypertension, and use of diuretics (each P < .004). On multivariate analysis, age, male gender, white race, and prior stroke retained strong associations with increased ventricular and sulcal scores. After adjustment for age, prior stroke, and other risk factors, white matter hyperintensity was associated with atherosclerosis as measured by increased internal carotid artery thickness on ultrasound. CONCLUSIONS: Cerebral atrophy and white matter hyperintensity are common in the elderly and are associated with age, prior stroke, and known cardiovascular risk factors. Though these findings have been suggested to represent normal aging, their wide variability and associations with cardiovascular disease argue against their inevitability with advancing age and support the need to identify modifiable risk factors for these abnormalities.

Age Factors↗

PubMed1994

Cardiovascular reactivity in cardiovascular disease: "once more unto the breach".

Discussed here are conceptual and methodologic issues that bear on the role of behaviorally evoked cardiovascular reactivity in cardiovascular disease. It is argued that recent criticisms concerning the validity of cardiovascular reactivity as a stable dimension of individual differences arise from inadequacies of measurement prevalent in prior literature. With standardization of test stimuli and application of psychometric principles lo protocol development, assessment of reactivity are found to be highly reliable and, in turn, to demonstrate the dispositional nature of this construct. Recent studies also document an underlying heterogeneity of hemodynamic reactions to stress, with distinct cardiac and vascular components. Because hemodynamic adjustments show some plasticity under differing task conditions, responses seen in particular contexts reflect influences of both an individual-specific response potential and response-eliciting properties of the stimulus. On the question of disease relevance, it is concluded that cardiovascular reactivity cannot yet be considered an established risk factor for either coronary heart disease or hypertension. However, the preponderance of existing clinical, experimental. and epidemiologic evidence is consistent with such an association and warrants further study in the context or population-based, prospective investigation.

Journal Article↗

PubMed1992

[Cardiovascular surgery in Spain in 1991. Registry of operations of the Spanish Society of Cardiovascular Surgery (SECCV)].

The Spanish Society of Cardiovascular Surgery has sent a questionnaire to all 37 cardiovascular surgical groups to know the number and type of cardiovascular operations carried out in our country during 1991. The questionnaire was answered by 36 out of 37. In the year 1991, 21,771 cardiovascular patients have been operated upon and 10,913 interventions with extracorporeal circulation have been carried out: 42.4% in valvular disease, 37.2% in coronary and 11.2% in congenital. The number of operations was 5,415 for vascular disease, 4,627 for valvular, 3,168 for coronary, 1,896 for congenital and 3,741 for pacemaker implantation. The total number of operations in 1991 comparing to those performed during 1988 is similar; but the number of open heart operation and the number of these per cardiac unit and per million population during 1991 have increased 20.5, 13.9 and 24.3% respectively. Coronary and valvular operations have also increased 11 and 27% respectively, as well as the number of pacemaker implanted (30%). The number of congenital cases remains the same and the number of vascular operations has decreased by 7.9%.

Cardiac Surgical Procedures↗

PubMed1991

[Cardiovascular surgery in Spain in 1990. The registry of operations of the Spanish Society of Cardiovascular Surgery].

The Spanish Society of Cardiovascular Surgery has sent a questionnaire to all 37 cardiovascular surgical groups to know the number and type of cardiovascular operations carried out in our country during 1990. The questionnaire was answered by 36 our of 37. In the year 1990, 20.806 cardiovascular patients have been operated upon and 10.065 interventions with extracorporeal circulation have been carried out: 43% in valvular disease, 37% in coronary and 11% in congenital. The number of operations was 5.541 for vascular disease, 4.364 for valvular, 3.917 for coronary, 2.019 for congenital and 4.617 for pacemaker implantation. The number of operations in 1990 is similar to the previous years. There is an increase of about 500 operations under extracorporeal circulation per year in the latest 2 years, mainly due to coronary bypass surgery. The number of vascular operations has slightly been reduced.

Cardiac Surgical Procedures↗

PubMed2006

Impact of sex-specific body composition on cardiovascular risk factors: the Hong Kong Cardiovascular Risk Factor Study.

The aim of the study was to analyze the effects of sex-specific distribution of adiposity, particularly emphasizing the independent contribution of waist and hip circumferences relative to body mass index (BMI), on cardiovascular risk factors in a Chinese population. Blood pressure and anthropometric and biochemical parameters were measured in 2510 population-based Chinese subjects. The relative contributions of waist and hip circumferences to the presence of cardiovascular risk factors were determined. The Chinese men were significantly larger than women, with greater BMI and central adiposity. Waist and hip circumferences were both positively associated with the presence of hypertension, dyslipidemia, and diabetes. However, after adjustment for BMI and age, hip circumference exhibited a significant dose-dependent inverse relationship with dyslipidemia and diabetes in women, but not men. Sex-specific differences exist. After adjustment for age and BMI, hip circumferences independently and inversely contribute to cardiovascular risk in women, but not in men. Increasing adjusted waist circumference was associated with increased risk of hypertension and diabetes in Chinese and dyslipidemia in women only.

Abdominal Fat↗

PubMed2004

The association of personal and neighborhood socioeconomic indicators with subclinical cardiovascular disease in an elderly cohort. The cardiovascular health study.

There has been recent interest in determining whether neighborhood characteristics are related to the cardiovascular health of residents. However, there are no data regarding the relationship between neighborhood socioeconomic status (SES) and prevalence of subclinical cardiovascular disease (CVD) in the elderly. We related personal SES (education, income, and occupation type) and neighborhood socioeconomic characteristics (a block-group score summing six variables reflecting neighborhood income and wealth, education, and occupation) to the prevalence of subclinical CVD (asymptomatic peripheral vascular disease or carotid atherosclerosis, electrocardiogram or echocardiogram abnormalities, and/or positive responses to Rose Questionnaire claudication or angina pectoris) among 3545 persons aged 65 and over, without prevalent CVD, in the Cardiovascular Health Study. Sixty percent of participants had at least one indicator of subclinical disease. Compared to those without, those with subclinical disease had significantly lower education, income, and neighborhood scores and were more likely to have blue-collar jobs. After adjustment for age, gender, and race, those in the lowest SES groups had increased prevalence of subclinical disease compared with those in the highest SES groups (OR = 1.50; 95% CI 1.21, 1.86 for income; OR = 1.41; 95% CI 1.18, 1.69 for education; OR = 1.39; 95% CI 1.16, 1.67 for block-group score). Those reporting a blue-collar lifetime occupation had greater prevalence of subclinical disease relative to those reporting a white-collar occupation (OR = 1.29; 95% CI 1.02-1.59). After adjustment for behavioral and biomedical risk factors, all of these associations were reduced. Neighborhood score tended to remain inversely associated with subclinical disease after adjustment for personal socioeconomic indicators but associations were not statistically significant. Personal income and blue-collar occupation remained significantly associated with subclinical disease after simultaneous adjustment for neighborhood score and education. Personal and neighborhood socioeconomic indicators were associated with subclinical disease prevalence in this elderly cohort. These relationships were reduced after controlling for traditional CVD risk factors.

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PubMed1999

Homocysteine metabolism in cardiovascular cells and tissues: implications for hyperhomocysteinemia and cardiovascular disease.

We have determined the activity and protein levels of CBS in a number of cardiovascular cells and tissues by direct enzyme assay and Western blot analysis, respectively. We have also determined the activity of BHMT in these same tissues and cells and have come to the conclusion that neither enzyme is expressed. This results suggests that in the human cardiovascular system homocysteine metabolism is limited to the remethylation pathway catalyzed by MS. Thus, hyperhomocysteinemia in conjunction with a limited metabolic capacity for homocysteine in the cardiovascular system could result in cellular dysfunction.

Animals↗

PubMed1998

Cardiovascular assessment for home healthcare nurses. Part 1: Initial cardiovascular assessment.

A description of the technique for standard cardiovascular assessment as it applies to patients in the home care setting is provided in this two-part article. The first, Initial Cardiovascular Assessment, covers basic physical assessment of the cardiovascular patient. The second article, Assessing Blood Pressure and Cardiac Function, which will appear in the August, 1998 issue, provides information that home care nurses can use to develop a thorough method of blood pressure, heart, and breath sound assessment.

Auscultation↗

PubMed2003

Cardiovascular calcifications in uremic patients: clinical impact on cardiovascular function.

Cardiovascular disease is the leading cause of mortality among patients with ESRD (chronic kidney disease stage 5). Left ventricular hypertrophy and arterial diseases are the two principal risk factors for cardiovascular mortality in hemodialysis patients. Epidemiologic studies show that damage to large conduit arteries contributes to morbidity and mortality in patients with chronic kidney disease. Atherosclerosis is primarily an intimal disease characterized by the presence of plaques and occlusive lesions. Although atherosclerosis is the most frequent underlying cause of cardiovascular disease in patients with ESRD, it represents only one form of structural response to metabolic and hemodynamic alterations that interfere with the process of aging. Arterial alterations in ESRD include nonocclusive arterial remodeling accompanying the growing hemodynamic burden and humoral abnormalities that are associated with chronic uremia. The consequences of these alterations are different from those attributed to atherosclerotic plaques and are characterized principally by hardening (stiffening) of arteries. Arteriosclerosis, characterized by stiffening of the aorta and large capacitative arteries, is a major determinant of left ventricular pressure overload and of abnormal coronary perfusion. Atherosclerosis and arteriosclerosis are frequently comorbid and characterized by a high degree of both intimal and medial calcifications in patients with ESRD. The extent of calcifications and the degree of arterial stiffening are independent predictors of mortality. Studies in patients with ESRD have shown that attenuation of arterial stiffness can have a favorable effect, associated with regression of left ventricular hypertrophy, on survival. Calcium-free, metal-free phosphate binders such as sevelamer can reduce calcification scores.

Aorta↗

PubMedDate not supplied

Subclinical cardiovascular disease in older adults: insights from the Cardiovascular Health Study.

Knowledge about the epidemiology of subclinical cardiovascular disease (SCVD) in older adults may hold the key for improved opportunities for primary prevention of cardiovascular disease (CVD), a top clinical and public health priority. This review reports findings on the prevalence of SCVD and the ability of SCVD measures to predict incident and adverse outcomes from one of the largest (N=5888) and most comprehensive prospective observational studies on SCVD in older adults, the Cardiovascular Health Study. According to a composite index that combined SCVD measures from different vascular beds, the overall prevalence of SCVD was 37%, making it as common as clinically overt CVD in older adults. SCVD measures strongly predicted incident CVD, stroke, mortality, frailty, and physical and cognitive decline, even after adjustment for traditional CVD risk factors. Ongoing research will address the potential use of SCVD for clinical decision making in older adults.

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PubMed2005

The metabolic syndrome in older individuals: prevalence and prediction of cardiovascular events: the Cardiovascular Health Study.

OBJECTIVE: The prevalence of the metabolic syndrome, a potent risk factor for cardiovascular diseases (CVDs), has not been adequately explored in older individuals. Moreover, two sets of criteria have been proposed for the definition of metabolic syndrome, one by the World Health Organization (WHO) and one by the National Cholesterol Education Program Adult Treatment Panel III (NCEP ATPIII). We therefore investigated the prevalence of this syndrome in a subgroup of older participants from the Cardiovascular Health Study (CHS) who were free of CVD at baseline. We also compared the prognostic significance of the two definitions of the metabolic syndrome. RESEARCH DESIGN AND METHODS: A total of 2,175 subjects from the CHS who were free of CVD at baseline and not taking antihypertensive or lipid-lowering medications were studied. Prevalence of the metabolic syndrome was assessed with both the WHO and ATPIII criteria. The incidence of coronary or cerebrovascular disease was ascertained during a median follow-up time of 4.1 years. RESULTS: Prevalence of the metabolic syndrome was 28.1% by ATPIII criteria and 21.0% by WHO criteria. The two sets of criteria provided concordant classification for 80.6% of participants. Multivariate Cox propotional hazard models showed that the metabolic syndrome defined with the ATPIII criteria, but not with the WHO criteria, was an independent predictor of coronary or cerebrovascular events and was associated with a 38% increased risk (hazard ratio 1.38 [95% CI 1.06-1.79], P < 0.01). CONCLUSIONS: Prevalence of the metabolic syndrome in older individuals is approximately 21-28% (depending on the definition used). The two sets of criteria have 80% concordance in classifying subjects. As defined by the ATPIII criteria, the metabolic syndrome yields independent prognostic information, even after adjusting for traditional cardiovascular risk factors and the individual domains of the metabolic syndrome.

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PubMed2001

Preclinical cardiovascular research projects and capabilities at the Atlanta Cardiovascular Research Institute.

The professional and technical staff of the Atlanta Cardiovascular Research Institute preclinical laboratory facility are aggressively pursuing basic and applied research to aid in the understanding of cardiovascular disease and develop new therapeutic approaches. We are optimistic that our intense and broad-ranging research efforts will contribute to important advances in the care of cardiovascular disease patients in the near future and for years to come.

Academies and Institutes↗

PubMed1996

Physical activity and cardiovascular health. NIH Consensus Development Panel on Physical Activity and Cardiovascular Health.

OBJECTIVE: To provide physicians and the general public with a responsible assessment of the relationship between physical activity and cardiovascular health. PARTICIPANTS: A nonfederal, nonadvocate, 13-member panel representing the fields of cardiology, psychology, exercise physiology, nutrition, pediatrics, public health, and epidemiology. In addition, 27 experts in cardiology, psychology, epidemiology, exercise physiology, geriatrics, nutrition, pediatrics, public health, and sports medicine presented data to the panel and a conference audience of 600 during a 2-day public session. Questions and statements from conference attendees were considered during the open session. Closed deliberations by the panel occurred during the remainder of the second day and the morning of the third day. EVIDENCE: The literature was searched through MEDLINE and an extensive bibliography of references was provided to the panel and the conference audience. Experts prepared abstracts with relevant citations from the literature. Scientific evidence was given precedence over clinical anecdotal experience. CONSENSUS PROCESS: The panel, answering predefined questions, developed their conclusions based on the scientific evidence presented in open forum and the scientific literature. CONSENSUS STATEMENT: The panel composed a draft statement that was read in its entirety and circulated to the experts and the audience for comment. There-after, the panel resolved conflicting recommendations and released a revised statement at the end of the conference. The panel finalized the revisions within a few weeks after the conference. CONCLUSIONS: All Americans should engage in regular physical activity at a level appropriate to their capacity, needs, and interest. Children and adults alike should set a goal of accumulating at least 30 minutes of moderate-intensity physical activity on most, and preferably all, days of the week. Most Americans have little or no physical activity in their daily lives, and accumulating evidence indicates that physical inactivity is a major risk factor for cardiovascular disease. However, moderate levels of physical activity confer significant health benefits. Even those who currently meet these daily standards may derive additional health and fitness benefits by becoming more physically active or including more vigorous activity. For those with known cardiovascular disease, cardiac rehabilitation programs that combine physical activity with reduction in other risk factors should be more widely used.

Adult↗

PubMed2006

10-year follow-up of subclinical cardiovascular disease and risk of coronary heart disease in the Cardiovascular Health Study.

BACKGROUND: The incidence of coronary heart disease (CHD) is very high among individuals 65 years or older. METHODS: We evaluated the relationships between measurements of subclinical disease at baseline (1989-1990) and at the third-year follow-up examination (1992-1993) and subsequent incidence of cardiovascular disease and total mortality as of June 2001. Approximately 61% of the participants without clinical cardiovascular disease at baseline had subclinical disease based on our previously described criteria from the Cardiovascular Health Study. RESULTS: The incidence of CHD was substantially increased for participants with subclinical disease compared with those who had no subclinical disease: 30.5 per 1000 person-years with and 16.3 per 1000 person-years without for white individuals, and 31.2 per 1000 person-years with and 12.5 per 1000 person-years without for black individuals. The risk persisted over the entire follow-up period. Incidence rates were higher for men than for women with or without subclinical disease, but there was little difference in rates for black individuals and white individuals. CONCLUSIONS: In multivariable models, subclinical disease at baseline remained a significant predictor of CHD in both men and women; the hazard ratios (95% confidence intervals) of their relative risks were 1.64 (1.30-2.06) and 1.49 (1.21-1.84), respectively. The presence of subclinical disease substantially increased the risk of subsequent CHD for participants with hypertension, diabetes mellitus, or elevated C-reactive protein. In summary, subclinical disease is very prevalent among older individuals, is independently associated with risk of CHD even over a 10-year follow-up period, and substantially increases the risk of CHD among participants with hypertension or diabetes mellitus.

Aged↗

PubMedDate not supplied

Male-type fat distribution is associated with cardiovascular risk factors and the prevalence of cardiovascular disease in noninsulin-treated diabetics.

Abdominal fat distribution estimated by the waist/hip ratio (WHR) was studied in 85 subjects (55 men, 30 women) with treated noninsulin-dependent diabetes mellitus (NIDDM), and its association with cardiovascular disease and cardiovascular risk factors was analyzed. In men, WHR was highly correlated with the body mass index (BMI; r = 0.697), but this was not true in women (r = 0.091). In men, WHR was significantly and positively correlated with mean diastolic blood pressure (DBP) level. In women, this correlation was also positive, but of lesser degree. Fasting plasma insulin was highly correlated with BMI and WHR in men, but not in women. In both sexes, WHR was positively correlated with fasting serum triglyceride and negatively correlated with serum high-density lipoprotein cholesterol. In addition, mean WHR, but not BMI, was significantly greater in subjects with cardiovascular disease (positive electrocardiographic signs and/or history of angina, myocardial infarction, stroke, intermittent claudication).

Adipose Tissue↗

PubMed2005

Hyperuricemia as a risk factor on cardiovascular events in Taiwan: The Chin-Shan Community Cardiovascular Cohort Study.

Little is known about uric acid role for cardiovascular events in the Asian-Pacific countries with relatively low coronary heart disease (CHD) but high stroke events. Also, there is scanty evidence for repeated measures of uric acid levels among population. We examined associations of basic and repeated measures of uric acid level with CHD and stroke events in one Taiwanese adult community prospectively. Cox proportional hazards models, treating uric acid as baseline and time-dependent covariates, were used to assess the 11-year risk of CHD and stroke events. Among 3602 adult subjects older than 35 years, 86 incident CHD and 155 incident stroke cases were identified. The rate ratios of hyperuricemia ranged between 2.00 and 3.96, with higher risk ratios in women than in men. The rate differences and population attributable fractions were also higher in women than in men, implying that women had high risk of uric acid on cardiovascular events. After adjustment for age effect, time-dependent uric acid was associated with significant CHD risk in both genders (hazard risk [HR] 1.43, 95% CI: 1.10-1.87 in men and HR 1.22, 95% CI: 1.03-1.44 in women). But the magnitude of hazard risks decreased after adjusting more atherosclerotic risk factors for CHD. For stroke event, the age-adjusted hazard risk of time-dependent continuous uric acid level was 1.23 (95% CI: 1.00-1.54) in men and 1.36 (95% CI: 1.05-1.75) in women. Multiple adjustment by risk factors demonstrated that uric acid was still a significant predictor for stroke in women (HR 1.32, 95% CI: 1.00-1.73). The similar hazard risk patterns existed for binary categories of hyperuricemia. Subgroup analyses demonstrated uric acid had significant risk only in hypertension and metabolic syndrome subgroups, not in their counterparts. We concluded that uric acid, in the baseline and time-dependent variables, could predict cardiovascular events in the community of relatively low CHD but high stroke risk in Taiwan.

Adult↗

PubMed2004

Prevalence of specific variant carotid geometric patterns and incidence of cardiovascular events in older persons. The Cardiovascular Health Study (CHS E-131).

OBJECTIVES: We hypothesized that variant geometric patterns of the common carotid artery (CCA) predict the incidence of cardiovascular disease (CVD), after accounting for CCA intima-medial thickness (IMT). BACKGROUND: Common carotid artery intima-media thickness has been associated with the incidence of cardiovascular disease. METHOD: Noninvasive measurements of IMT were made with high-resolution ultrasonography in 5,640 subjects 65 years of age or older participating in the Cardiovascular Health Study. New coronary and/or cerebrovascular events served as outcome variables over a median 10.2-year follow-up. To characterize different carotid structural geometric patterns (CGP), vascular mass (VM) was combined with the wall-to-lumen ratio (W/L). Normal values for W/L and VM were defined as age-adjusted, gender-specific 75th percentiles of the 1,899 normotensive subjects free of CVD at baseline. Four CGPs were defined: CGP1 = normal W/L ratio and VM; CGP2 = arterial remodeling (i.e., increased W/L ratio with normal VM); CGP3 = arterial hypertrophy (i.e., increased W/L ratio with increased VM); and CGP4 = arterial hypertrophy with dilation (i.e., normal W/L ratio and increased VM). RESULTS: Coronary or cerebrovascular events (adjusted for age, gender, traditional risk factors, and IMT) were associated with CGP in subjects free of CVD at baseline. Specifically, the hazard ratio (Cox proportional-hazards analyses) for CGP3 (arterial hypertrophy) was 1.25 (95% confidence interval [CI] 1.03 to 1.53), and for CGP4 (arterial hypertrophy with dilation) was 1.43 (95% CI 1.16 to 1.75) compared with CGP1 (normal). CONCLUSIONS: Arterial hypertrophy defined by variant CGP patterns is associated with the development of new CVD, independent of age, traditional risk factors, and CCA IMT.

Aged↗

PubMed2005

Cardiovascular risk factors for retinal vein occlusion and arteriolar emboli: the Atherosclerosis Risk in Communities & Cardiovascular Health studies.

OBJECTIVE: To examine the associations of retinal vein occlusion and arteriolar emboli with cardiovascular disease. DESIGN: Population-based cross-sectional study. PARTICIPANTS: Pooled from the Atherosclerosis Risk in Communities Study (n = 12,642; mean age, 60 years) and the Cardiovascular Health Study (n = 2824; mean age, 79 years). METHODS: Retinal vein occlusion and arteriolar emboli were identified from a single nonmydriatic retinal photograph using a standardized protocol. Photographs were also graded for arteriovenous nicking and focal arteriolar narrowing. All participants had a comprehensive systemic evaluation, including standardized carotid ultrasonography. MAIN OUTCOME MEASURES: Retinal vein occlusion and arteriolar emboli. RESULTS: Prevalences of retinal vein occlusion and arteriolar emboli were 0.3% (n = 39 cases) and 0.2% (n = 34 cases), respectively. After adjusting for age, retinal vein occlusion was associated with hypertension (odds ratio [OR], 2.96; 95% confidence interval [CI], 1.43-6.14), systolic blood pressure (BP) (OR, 4.12; 95% CI, 1.40-12.16; highest quartile vs. lowest), diastolic BP (OR, 2.64; 95% CI, 1.07-6.46; highest quartile vs. lowest), carotid artery plaque (OR, 5.62; 95% CI, 2.60-12.16), body mass index (OR, 3.88; 95% CI, 1.23-12.18; highest quartile vs. lowest), plasma fibrinogen (OR, 3.29; 95% CI, 1.08-10.02; highest quartile vs. lowest), arteriovenous nicking (OR, 4.09; 95% CI, 2.00-8.36), and focal arteriolar narrowing (OR, 5.17; 95% CI, 2.59-10.29). After adjusting for age, retinal arteriolar emboli were associated with hypertension (OR, 3.14; 95% CI, 1.44-6.84), systolic BP (OR, 3.46; 95% CI, 1.13-10.65; highest quartile vs. lowest), prevalent coronary heart disease (OR, 2.33; 95% CI, 1.01-5.42), carotid artery plaque (OR, 4.62; 95% CI, 1.85-11.57), plasma lipoprotein (a) (OR, 3.69; 95% CI, 1.20-11.41; highest quartile vs. lowest), plasma fibrinogen (OR, 3.09; 95% CI, 0.98-9.76; highest quartile vs. lowest), and current cigarette smoking (OR, 3.08; 95% CI, 1.47-6.47). Approximately a quarter of participants with retinal vein occlusion and arteriolar emboli had evidence of carotid artery plaque as defined from ultrasound. CONCLUSIONS: Retinal vein occlusion and retinal arteriolar emboli are associated with carotid artery disease, hypertension, and other cardiovascular risk factors.

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