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Stroke is a leading cause of death and morbidity, but incidence rates vary dramatically from one population to another. The reasons for this heterogeneity are being explored in several large-scale epidemiologic studies around the world. Much of the heterogeneity in stroke can be related to the prevalence of risk factors, but some populations have a higher stroke incidence than would be predicted from risk factor levels. Hypertension, including borderline hypertension, is probably the most important stroke risk factor based on degree of risk and prevalence. However, cardiac morbidity, cigarette smoking, diabetes, physical inactivity, and high levels of alcohol consumption are also strongly related to stroke risk. High levels of blood cholesterol and homocysteine may also increase stroke risk. Mortality after stroke is highest within the first 30 days but remains elevated to a degree that depends on the presenting stroke syndrome, stroke subtype, and other co-morbidities. Lacunar strokes have the best short- and long-term prognoses. Strokes due to large-vessel atherosclerosis frequently worsen; these and cardioembolic strokes have the poorest long-term prognosis. The risk for recurrence is also highest within 30 days after a first stroke, depending on the type of infarct, history of hypertension, and blood glucose levels on admission. Predictors of late recurrence include cardiac disease, hypertension, and heavy alcohol use. Only about half of stroke survivors are independent 6 months after a stroke, and quality of life is decreased. Understanding factors that predispose to stroke and determine its outcome will help in the design of acute stroke trials and in prevention programs.
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PMID:Risk factors and their management for stroke prevention: outlook for 1999 and beyond. 1053 44

An epidemic of cardiovascular disease (CVD) and end stage renal disease (ESRD) has developed among Aborigines in the Northern Territory; CVD deaths increased over the 1980s (tripling among women!), and are now more than five times those of non-Aboriginal people, while ESRD rates are increasing more than 20-fold and are doubling every three to four years. Dialysis costs (>$75,000 per person/year) pose a crisis for health care budgets, but premature mortality is the greater human catastrophe. Health services are not meeting the challenge of timely diagnosis, prevention and containment. We screened 90% of adults (20+ years) in one community, with CVD mortality among the highest in Australia, and ESRD rates increased 60-fold. Seventy-five per cent of persons were smokers. Central obesity was common, but BMIs only modestly increased by Caucasian standards, 23% had hypertension (>140/90), 29% had diabetes or impaired glucose tolerance (IGT) (peaking at 65% of persons aged 40-49 years), high triglyceride and insulin levels were common, and 55% had albuminuria (albumin/creatinine ratio (ACR), >3.4 gm/moL). Progressive albuminuria predicted renal failure. ACR was correlated with age, BMI, blood pressure, lipid, glucose and insulin levels, heavy drinking and past and current skin infections, and, inversely with birth weight. ACR correlated strongly with a composite CV risk score, and in a two to five year follow-up, microalbuminuria (ACR 3.4-33) and overt albuminuria (ACR 34+) have both predicted increased rate of premature death from natural causes of lower ACRs. Thus albuminuria marks CV risk/disease. This implies that renal and CV disease share common risk factors, and should respond to the same interventions, and that this response might be monitored through ACR levels. Robust public health programmes could reduce all these reversible risk factors, lowering disease rates over the intermediate term, however, few such programmes are in place. Modification of disease in persons already afflicted is a parallel responsibility. To this end, in November 1995, we introduced a treatment programme with Coversyl (perindopril, Servier) for all persons in the study community with hypertension (>140/90), for all diabetics with ACR 3.4+ and for all nondiabetic, non-hypertensive persons with progressive overt albuminuria (ACR 34+). One-quarter of all adults, or 224 persons have enrolled; 162 have reached one year of treatment and 100 have passed two years. Compliance is reasonable and enthusiasm high. Average SBP has fallen 12 mmHg (24 mmHg in hypertensive persons), while average ACR and estimated glomerular filtration rate (GFR) have stabilised. This contrasts favourably with the pretreatment course (average 2.7 years) in the same persons, when SBP had increased by 3 mmHg, ACR had increased by 15% and GFR had decreased by 3.5 mL/min each year. Cautious estimates suggest a >50% fall in ESRD, and a reduction in all-cause and CV deaths, even at this early stage, although more extended observation is needed. These data predict a dramatic and rapid fall in morbidity, premature deaths and health care costs if these basic principles of medical care are extended to all Aboriginal people. A national, concerted, multi-disciplinary effort to implement a coherent, effective strategy to this end is of great urgency.
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PMID:Stemming the tide: reducing cardiovascular disease and renal failure in Australian Aborigines. 1086 23

The etiology of pancreatic cancer is poorly understood, partly because of the inconsistency of findings among case-control studies of pancreatic cancer. Because of the unfavorable prognosis for pancreatic cancer, many case-control studies have been based largely on interviews with next of kin, who are known to report less reliable information on potential risk factors than original respondents. The purpose of this study was to estimate the effects of speculative risk factors such as dietary/nutritional factors and alcohol drinking, as well as those of established risk factors such as cigarette smoking, diabetes mellitus, and family history of pancreatic cancer, on pancreatic cancer risk based solely on direct interviews. This investigation was a population-based case-control study of pancreatic cancer diagnosed in Atlanta (GA), Detroit (MI), and ten New Jersey counties from August 1986 through April 1989. Direct interviews were conducted with 526 incident cases and 2,153 population controls. This study revealed a significant interaction between body mass index and caloric intake that was consistent by both race and gender. Subjects with elevated body mass index and caloric intake had increased risk, whereas those with elevated values for one of these factors but not the other experienced no increased risk. This finding suggests that energy balance may play a major role in pancreatic carcinogenesis. Diabetes mellitus was also a risk factor for pancreatic cancer, as well as a possible complication of the tumor. Our data are consistent with a key role for hyperinsulinemia in pancreatic carcinogenesis, particularly among non-diabetics with an elevated body mass index. A three-fold risk of pancreatic cancer among first-degree relatives of affected individuals was apparent. An increased risk also was associated with a family history of colon, endometrial, ovary, and breast cancer, suggesting a possible link to hereditary non-polyposis colon cancer. Our findings support a causal role for cigarette smoking in pancreatic carcinogenesis. Alcohol drinking at levels typically consumed by the general population of the United States did not appear to be a risk factor for pancreatic cancer, although heavy drinking may be related to risk, particularly in blacks.
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PMID:Risk factors for pancreatic cancer: a case-control study based on direct interviews. 1113 18

Numerous epidemiological studies have disclosed documented evidence that light to moderate consumption of any alcoholic beverage is associated with approximately 20% reduction in cardiovascular disease risk. This finding applies to both men and women and to healthy individuals as well as those with coronary heart disease, diabetes, hypertension, or heart failure. Nevertheless, the issue of including a recommendation for mild to moderate alcohol consumption within the routine recommendations for primary and secondary prevention of coronary heart disease is still controversial. The controversy is derived partly from methodological issues and partly from documented adverse health effects of excessive alcohol drinking. The key issue is the definition of the optimal dose of alcohol which guarantees a positive benefit-risk ratio, i.e. enjoying the benefits of alcohol without substantial risk. The accumulating scientific evidence shows that a daily consumption of less than 30 grams of alcohol for men and less than 15 grams for women is compatible with the above goal and is not associated with health risks. Therefore, for most individuals it is appropriate to recommend mild to moderate alcohol consumption as part of a healthy life style for the prevention of cardiovascular disease. Recommendations should be given on an individual basis, taking into account the patient's age, gender, physical and mental health status, personality and past drinking habits. The desirable quantity and its upper limit as well as drinking patterns should be clearly defined. All persons should be warned to avoid heavy drinking. Awareness of indications for abstinence from alcohol such as pregnancy, sport activity and the use of certain medications is highly important.
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PMID:[Is drinking alcohol good for your health?]. 1175 77

Aggressive treatment of atherosclerotic risk factors can substantially reduce stroke risk in patients with a history of stroke or transient ischemic attack. Data from several recent large clinical trials provide convincing evidence of benefit for a number of specific therapies directed at this population. The authors recommend treatment with ramipril alone or perindopril plus indapamide regardless of blood pressure, provided there is no contraindication. For patients already taking a different angiotensin- converting enzyme (ACE) inhibitor, the authors do not routinely switch agents. The authors recommend use of simvastatin 40 mg per day in patients with a total cholesterol level of 135 mg/dL or greater, provided no contraindication exists. The authors also recommend consideration of gemfibrozil in patients with isolated low high- density lipoprotein levels. In patients with diabetes mellitus, tight glycemic control has not been shown to reduce macrovascular complications such as stroke, but does reduce microvascular complications. However, diabetics should receive especially aggressive treatment of other vascular risk factors. There is no role for post-menopausal hormone replacement therapy in prevention of stroke. Weight loss for overweight patients, regular exercise, and a diet rich in fruits, vegetables, cereals, and fish, as well as low in fat and cholesterol, should be a standard recommendation for this group of patients. Treatment with folic acid, B(6), and B(12) for patients with elevated homocysteine appears rational, though this is unproven. However, there is no benefit to vitamin E, vitamin C, or beta-carotene supplementation. Smokers should stop. For every 43 smokers who quit, one stroke is prevented. Moderate consumption of alcohol (one to two drinks a day) may be beneficial, but heavy alcohol use (more than five drinks a day) increases stroke risk.
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PMID:Atherosclerotic Risk Factors in Patients with Ischemic Cerebrovascular Disease. 1235 71

A population-based health interview and examination survey of 8 Inuit communities in the Kivalliq region of Nunavut, Canada, during the early 1990s has resulted in an increased understanding of the burden and extent of cardiovascular diseases and diabetes and their risk factors such as genetics, obesity, lipids, blood pressure and fatty acids. A recent national health interview survey which included a sample from Nunavut indicates that the Inuit still enjoy some advantages relative to other Canadians (lower level of self-reported diabetes and hypertension) and disadvantages (higher level of smoking, obesity, and heavy drinking). The pattern of health and disease among the Inuit is rapidly evolving, as the traditional lifestyle becomes further eroded. A long-term prospective cohort study that monitors this trend, investigates the etiology, and identifies potential interventions is urgently needed.
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PMID:Contributions to chronic disease prevention and control: studies among the Kivalliq Inuit since 1990. 1496 61

There is considerable debate about the association between individual socio-economic status, community socio-economic status and health. The current study examines individual data from a case-control study of stroke (n = 3489) conducted in Auckland, New Zealand. The study sought to identify whether individual socio-economic status (as measured by income from lifetime occupation) and community socio-economic status (measured in a number of ways) predicts the onset of stroke both independently and after controlling for individual risk factors (e.g., smoking, obesity and hypertension). Logistic regression results show that individual socio-economic status and all of the community socio-economic status measures predict the onset of stroke before controlling for individual risk factors. However, there is a high correlation between the various measures of community socio-economic status. Stepwise regression results suggest that average household income is the measure of community-level socio-economic status with the greatest predictive power. The results suggest that individual income and average household income are significant predictors of onset of stroke both independently and after controlling for behavioural and medical risk factors. Logistic regression analysis of the pathway suggests that individual income is a significant predictor of smoking and obesity, and that community socio-economic status is a significant predictor of heart disease, heavy drinking, diabetes, smoking and obesity.
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PMID:Individual socio-economic status, community socio-economic status and stroke in New Zealand: a case control study. 1597 Feb 29

Myocardial damage from heavy alcohol intake can cause the heart failure (HF) syndrome, but the relation of lighter alcohol intake to HF has rarely been studied. We examined the risk of HF hospitalization among 126,236 subjects who supplied data about alcohol during health examinations from 1978 to 1985. Among 2,594 subjects who were subsequently hospitalized for HF, record review established an association between coronary artery disease (CAD) and HF (CAD-HF) in 1,559 patients. Among the remaining 1,035 subjects who had HF (non-CAD-HF), we attempted determination of preponderant etiologic and contributory factors. Analyses used Cox models that were controlled for 7 covariates, with usual alcohol intake studied categorically compared with that in subjects who did not drink alcohol. Heavier drinkers (> or =3 drinks/day) but not light to moderate drinkers had increased risk of non-CAD-HF; e.g., relative risk for subjects who reported > or =6 drinks/day was 1.7 (95% confidence interval 1.1 to 2.6). This association of non-CAD-HF with heavy drinking was limited to subsets with cardiomyopathy or of unclear preponderant etiology. Alcohol drinking was inversely related to risk of CAD-HF (e.g., at 1 to 2 drinks/day, relative risk 0.6, 95% confidence interval 0.5 to 0.7), with consistency across subgroups of age, gender, ethnicity, education, smoking status, interval to diagnosis, and presence or absence of baseline heart disease or systemic hypertension. Moderate drinking was inversely related to non-CAD-HF only in subjects who had diabetes mellitus (n = 252). In conclusion, heavy, but not light, alcohol drinking is associated with increased risk of non-CAD-HF and that apparent protection by alcohol drinking against CAD-HF risk provides confirmation of a protective effect of alcohol against CAD.
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PMID:Alcohol drinking and risk of hospitalization for heart failure with and without associated coronary artery disease. 1605 55

Although moderate alcohol intake is associated with reduced risk of atherosclerotic disease in both the general population and in diabetic patients, a recent report suggests that heavy alcohol intake facilitates the development of atherosclerosis exclusively in diabetic individuals. We studied cross-sectionally the effects of the interaction between ethanol consumption category and the prevalence of diabetes on plasma total homocysteine (tHcy), a risk factor for atherosclerotic disease, in middle-aged men. Heavy drinking was associated with elevated tHcy levels only in diabetic subjects but not in non-diabetic subjects. Plasma tHcy of heavy drinkers (average ethanol consumption > 30 ml/day) was higher than that of abstainers in the diabetic subgroup (10.25 +/- 3.39 vs. 8.88 +/- 1.94 micromol/l, P < 0.05), whereas tHcy levels in heavy drinkers were comparable with that of abstainers in the non-diabetic subgroup (9.36 +/- 2.52 vs. 9.12 +/- 2.10 micromol/l, NS). In a two-factor anova, significant interaction was observed on the effects of ethanol consumption category and diabetes prevalence on tHcy levels (P < 0.01). Confounding factors including folate, vitamin B(12), creatinine, age or cigarette smoking did not contribute to the interaction. These findings may partly explain the reported association between heavy drinking and atherosclerosis in diabetic subjects.
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PMID:Heavy alcohol intake, homocysteine and Type 2 diabetes. 1617 97

The association of lifetime alcohol drinking pattern with the prevalence of the metabolic syndrome is largely unknown. Analyses were conducted on a population-based sample in a cross-sectional study (N=2818, ages 35-79 years, 93% whites). Included were subjects who drank at least once a month for a period of at least six months during their lifetimes and were free of cardiovascular disease and cancer at the time of interview. Lifetime drinking measures included total years of drinking, total drinking days, volume (total drinks) and average intensity (#drinks/drinking day); frequency of intoxication and heavy drinking; and age drinking began and ended. Metabolic syndrome components included impaired fasting glucose (IFG), high triglycerides (HTG), low HDL cholesterol (LHDLC), abdominal obesity (ABO), and hypertension (HBP). Potential confounders examined were age, gender, race, family history of coronary heart disease or diabetes, years of education, lifetime and current cigarette smoking, current drinking status, physical activity, and dietary factors. Multiple logistic regressions indicated that average intensity was directly related to IFG, HTG, HBP, and metabolic syndrome overall (p for linear trend=0.03, 0.04, 0.003, and 0.009, respectively) and to ABO in women only (p for trend=0.0004). Prevalence ratios (95% CI) for the metabolic syndrome according to quartiles of intensity were 1.00 (lowest), 1.23 (0.91-1.67), 1.43 (1.06-1.91) and 1.60 (1.12-2.30). Total drinking days was inversely related to LHDLC (p for trend=0.0002) and to ABO in women only (p for trend<0.0001). It is concluded that lifetime drinking patterns are significantly related to the prevalence of the metabolic syndrome.
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PMID:Lifetime alcohol drinking pattern is related to the prevalence of metabolic syndrome. The Western New York Health Study (WNYHS). 1651 81


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