Risk marker associations with venous thrombotic events: a cross-sectional analysis.

ObjectiveTo examine the interrelations among, and risk marker associations for, superficial and deep venous events-superficial venous thrombosis (SVT), deep venous thrombosis (DVT) and pulmonary embolism (PE).DesignCross-sectional analysis.SettingSan Diego, California, USA.Participants2404 men and women aged 40-79 years from four ethnic groups: non-Hispanic White, Hispanic, African-American and Asian. The study sample was drawn from current and former staff and employees of the University of California, San Diego and their spouses/significant others.Outcome measuresSuperficial and deep venous events, specifically SVT, DVT, PE and combined deep venous events (DVE) comprising DVT and PE.ResultsSignificant correlates on multivariable analysis were, for SVT: female sex, ethnicity (African-American=protective), lower educational attainment, immobility and family history of varicose veins. For DVT and DVE, significant correlates included: heavy smoking, immobility and family history of DVEs (borderline for DVE). For PE, significant predictors included immobility and, in contrast to DVT, blood pressure (BP, systolic or diastolic). In women, oestrogen use duration for hormone replacement therapy, in all and among oestrogen users, predicted PE and DVE, respectively.ConclusionsThese findings fortify evidence for known risk correlates/predictors for venous disease, such as family history, hormone use and immobility. New risk associations are shown. Striking among these is an association of PE, but not DVT, to elevated BP: we conjecture PE may serve as cause rather than consequence. Future studies should evaluate the temporal direction of this association. Oxidative stress and cell energy compromise are proposed to explain and predict many risk factors, operating through cell-death mediated triggering of coagulation activation

Associations of Perirenal Fat Thickness with Renal and Systemic Calcified Atherosclerosis.

BackgroundWe investigated associations between perirenal fat thickness and atherosclerotic calcification in six different vascular beds.MethodsUsing a community-based cohort (n=3,919), perirenal fat thickness was estimated from computed tomography scans. It was classified as Q1 (the lowest quartile) to Q4 (the highest quartile) in each sex. Calcification in the carotid arteries, coronary arteries, thoracic aorta, abdominal aorta, iliac arteries, and renal arteries was evaluated.ResultsPerirenal fat thickness was associated with older age (P<0.01) and a higher prevalence of obesity, hypertension, and dyslipidemia (P<0.01 for all). Perirenal fat thickness was independently associated with renal arterial calcification even after adjustment for age, sex, body mass index, hypertension, dyslipidemia, smoking history, and family history of heart diseases in first-degree relatives (odds ratio [OR] per quartile of perirenal fat thickness, 1.25; 95% confidence interval [CI], 1.09 to 1.44). Compared to Q1, the odds of renal arterial calcification in Q4 was about two times higher (OR, 2.05; 95% CI, 1.29 to 3.25). After adjustment for renal arterial calcification and atherosclerotic risk factors, the only other vascular bed where perirenal fat thickness showed a significant association with calcification was the abdominal aorta (OR, 1.11; 95% CI, 1.00 to 1.23; P=0.045).ConclusionPerirenal fat thickness was independently associated with vascular calcification in the renal artery and abdominal aorta

Quantified duplex augmentation in healthy subjects and patients with venous disease: San Diego population study

AbstractObjective: This study was undertaken to determine the quantitative augmentation response in several veins examined in a cohort assembled to permit comparisons by sex, age, and ethnicity, under normal conditions and in the presence of obstruction, with and without trophic changes. Method: The common femoral vein, superficial femoral vein, sapheno-femoral junction, popliteal vein, sapheno-popliteal junction, and posterior tibial vein were studied with duplex ultrasonographic scanning. Augmentation response was elicited with use of an automated cuff inflator. Mean level of each response was analyzed according to patient sex, age, and ethnicity, each adjusted for the other two. Normal values were compared with those obtained from legs with venous obstructive disease, with or without signs of trophic changes. Results: Decreased augmentation response was noted only in the sapheno-femoral junction and sapheno-popliteal junction, and was smaller in women. Augmentation response was slightly increased in the oldest age group (>70 years) in the common femoral vein, superficial femoral vein, popliteal vein, and posterior tibial vein. The highest augmentation response was found in Asian subjects, in the common and superficial femoral veins and the sapheno-femoral and sapheno-popliteal junctions; and the smallest augmentation response was found in African American subjects, in these same veins and junctions. Differences in vein diameters may explain these findings, ie, smaller diameters in Asians and larger diameters in African Americans. Most important, compared with normal values, augmentation response was decreased in legs with venous obstructive disease only when trophic changes were present. Conclusion: Like quantification of reflux, quantitative evaluation of the augmentation response may help in diagnosis of venous obstructive disease when trophic changes are present. (J Vasc Surg 2003;37:1054-8.

The association between lipoprotein-associated phospholipase A2 and cardiovascular disease and total mortality in vascular medicine patients

IntroductionIn some community-based studies, lipoprotein-associated phospholipase A2 (Lp-PLA2) has been shown to be independently predictive of future fatal and nonfatal cardiovascular disease (CVD) events. We tested the hypothesis that Lp-PLA2 is independently predictive of mortality in high-risk patients from a vascular laboratory.MethodsBetween 1990 and 1994, patients seen in the previous 10 years for noninvasive lower extremity arterial testing were invited to return for a vascular examination of the lower extremities. By medical record review, we identified 2265 eligible patients; of these, 508 returned for interviews, blood collection, and arterial examination and represent those who had survived, could be located, and were willing to participate. The 508 subjects were followed up for an average of 6.7 years until the end of the study period on December 31, 2001. Vital status was ascertained by multiple searches of the Social Security Death Index. The primary outcomes for this study were time to any, CVD, and coronary heart disease (CHD) mortality.ResultsThe mean age was 68.2 years, 88% were men, 87% were non-Hispanic white, 39.1% were diagnosed with peripheral arterial disease only, 9.2% with other CVD only, and 28.5% with both peripheral arterial disease and other CVD. During the entire follow-up period, 299 (59.7%) patients died, 167 from CVD, of which 88 deaths were due to coronary heart disease. With adjustment for CVD risk factors and baseline peripheral arterial disease and other CVD, an increment of one standard deviation in Lp-PLA2 activity was associated with a 40% higher risk for CHD mortality at 5 years of follow-up (P = .04). Additional adjustment for triglycerides, high-density lipoprotein, and low-density lipoprotein cholesterol reduced this association to nonsignificance (hazard risk, 1.12).ConclusionIn a vascular laboratory patient population, higher levels of LpPLA2 mass and activity were not significantly associated with total, CVD, or CHD mortality at 5 years of follow-up and after adjustment for traditional CVD risk factors and the presence of PAD and other CVD at baseline. An apparent elevated risk of CHD death associated with elevated Lp-PLA2 was largely explained by associated elevations in lipids and lipoproteins

Femoral Artery Atherosclerosis Is Associated With Physical Function Across the Spectrum of the Ankle-Brachial Index: The San Diego Population Study.

BackgroundThe ankle-brachial index (ABI) is inadequate to detect early-stage atherosclerotic disease, when interventions to prevent functional decline may be the most effective. We determined associations of femoral artery atherosclerosis with physical functioning, across the spectrum of the ABI, and within the normal ABI range.Methods and resultsIn 2007-2011, 1103 multiethnic men and women participated in the San Diego Population Study, and completed all components of the summary performance score. Using Doppler ultrasound, superficial and common femoral intima media thickness and plaques were ascertained. Logistic regression was used to assess associations of femoral atherosclerosis with the summary performance score and its individual components. Models were adjusted for demographics, lifestyle factors, comorbidities, lipids, and kidney function. In adjusted models, among participants with a normal-range ABI (1.00-1.30), the highest tertile of superficial intima media thickness was associated with lower odds of a perfect summary performance score of 12 (odds ratio=0.56 [0.36, 0.87], P=0.009), and lower odds of a 4-m walk score of 4 (0.34 [0.16, 0.73], P=0.006) and chair rise score of 4 (0.56 [0.34, 0.94], P=0.03). Plaque presence (0.53 [0.29, 0.99], P=0.04) and greater total plaque burden (0.61 [0.43, 0.87], P=0.006) were associated with worse 4-m walk performance in the normal-range ABI group. Higher superficial intima media thickness was associated with lower summary performance score in all individuals (P=0.02).ConclusionsFindings suggest that use of femoral artery atherosclerosis measures may be effective in individuals with a normal-range ABI, especially, for example, those with diabetes mellitus or a family history of peripheral artery disease, when detection can lead to earlier intervention to prevent functional declines and improve quality of life

Biomarkers in peripheral arterial disease patients and near- and longer-term mortality

To determine in patients with peripheral arterial disease (PAD) whether novel biomarkers improve prediction of cardiovascular disease (CVD) mortality and total mortality

The association between elevated ankle systolic pressures and peripheral occlusive arterial disease in diabetic and nondiabetic subjects

No Abstract

Risk factors for chronic venous disease: The San Diego Population Study

BackgroundThe etiology of chronic venous disease in the lower limbs is unclear, and very limited data are available on potential risk factors from representative population studies.MethodsParticipants in the San Diego Population Study, a free-living adult population randomly selected from age, sex, and ethnic strata, were systematically assessed for risk factors for venous disease. Categorization of normal, moderate, and severe disease was determined hierarchically through clinical examination and ultrasonography imaging by trained vascular technologists, who also performed anthropometric measures. An interviewer administered a questionnaire and an examination assessed potential risk factors for venous disease suggested by previous reports.ResultsIn multivariable models, moderate venous disease was independently related to age, a family history of venous disease, previous hernia surgery, and normotension in both sexes. In men, current walking, the absence of cardiovascular disease, and not moving after sitting were also predictive. Additional predictors in women were weight, number of births, oophorectomy, flat feet, and not sitting. For severe disease, age, family history of venous disease, waist circumference, and flat feet were predictive in both sexes. In men, occupation as a laborer, cigarette smoking, and normotension were also independently associated with severe venous disease. Additional significant and independent predictors in women were hours standing, history of leg injury, number of births, and cardiovascular disease, but African American ethnicity was protective. Multiple other postulated risk factors for venous disease were not significant in multivariable analysis in this population.ConclusionsAlthough some risk factors for venous disease such as age, family history of venous disease, and findings suggestive of ligamentous laxity (hernia surgery, flat feet) are immutable, others can be modified, such as weight, physical activity, and cigarette smoking. Overall, these data provide modest support for the potential of behavioral risk-factor modification to prevent chronic venous disease

Associations of Perirenal Fat Thickness with Renal and Systemic Calcified Atherosclerosis.

BackgroundWe investigated associations between perirenal fat thickness and atherosclerotic calcification in six different vascular beds.MethodsUsing a community-based cohort (n=3,919), perirenal fat thickness was estimated from computed tomography scans. It was classified as Q1 (the lowest quartile) to Q4 (the highest quartile) in each sex. Calcification in the carotid arteries, coronary arteries, thoracic aorta, abdominal aorta, iliac arteries, and renal arteries was evaluated.ResultsPerirenal fat thickness was associated with older age (P<0.01) and a higher prevalence of obesity, hypertension, and dyslipidemia (P<0.01 for all). Perirenal fat thickness was independently associated with renal arterial calcification even after adjustment for age, sex, body mass index, hypertension, dyslipidemia, smoking history, and family history of heart diseases in first-degree relatives (odds ratio [OR] per quartile of perirenal fat thickness, 1.25; 95% confidence interval [CI], 1.09 to 1.44). Compared to Q1, the odds of renal arterial calcification in Q4 was about two times higher (OR, 2.05; 95% CI, 1.29 to 3.25). After adjustment for renal arterial calcification and atherosclerotic risk factors, the only other vascular bed where perirenal fat thickness showed a significant association with calcification was the abdominal aorta (OR, 1.11; 95% CI, 1.00 to 1.23; P=0.045).ConclusionPerirenal fat thickness was independently associated with vascular calcification in the renal artery and abdominal aorta

Effects of Different Allotments of Avocados on the Nutritional Status of Families: A Cluster Randomized Controlled Trial.

Avocados are a nutrient-dense plant-food, but limited trial-derived evidence exists about the effects of avocado intake on family nutritional status. We investigated the impact of two levels of avocado allotment, plus a standard nutrition education intervention on the nutritional status of Hispanic/Latino families. Seventy-two families consisting of at least three members of ≥5 years of age and residing in the same home, free of severe chronic disease, not on specific diets, and self-identified of Hispanic heritage, were randomized to one of two levels of avocado allotment (low = 3/week/family or high = 14/week/family) for 6 months plus 12 bi-weekly nutrition education sessions. The primary outcomes included change in a family's total energy and macro- and micronutrient intakes. Primary analysis was intention-to-treat with unpaired, two-sided t-tests to assess mean changes between groups at 6 months. At 6 months, the high avocado allotment group had a significant reduction in energy intake, carbohydrate, animal and vegetable protein, saturated and polyunsaturated fat, calcium, magnesium, sodium, potassium, iron, and vitamin D intakes (all p < 0.05). A high allotment of avocados significantly reduced self-reported energy intake by 29% kcal/family/day, compared to a 3% kcal/family/day reduction in families who received a low allotment. Culturally-appropriate plant-food interventions may alter the nutritional status of at-risk families