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Alcohol and cardiovascular diseases: where do we stand today?
1Division of Research and Department of Cardiology, Northern California Kaiser Permanente, Oakland, CA, USA.
Insights
Heavy alcohol consumption increases cardiovascular risks, including cardiomyopathy and stroke. However, light to moderate drinking may reduce risks for coronary artery disease and heart failure, with potential benefits from wine consumption.
Area of Science:
- Cardiology
- Epidemiology
- Public Health
Background:
- Heavy alcohol consumption (≥3 drinks/day) is linked to significant cardiovascular (CV) and non-CV health risks.
- These CV risks include alcoholic cardiomyopathy, hypertension, arrhythmias, and stroke.
- Conversely, light-moderate alcohol intake is associated with lower morbidity and mortality, primarily due to reduced coronary artery disease risk.
Purpose of the Study:
- To review the complex relationship between alcohol consumption levels and various cardiovascular conditions.
- To explore potential mechanisms underlying alcohol's effects on cardiovascular health.
- To discuss the influence of beverage type, particularly wine, on cardiovascular outcomes.
Main Methods:
- Review of epidemiological studies and existing literature on alcohol consumption and cardiovascular disease.
- Analysis of proposed biological mechanisms for alcohol's impact on the cardiovascular system.
- Consideration of confounding factors and methodological challenges in alcohol-CV research.
Main Results:
- Heavy drinking elevates risks for conditions like alcoholic cardiomyopathy, hypertension, atrial arrhythmias, and stroke.
- Light-moderate drinking is associated with decreased risk of coronary artery disease and heart failure.
- Alcohol's protective effect against coronary artery disease is supported by evidence, but mechanisms for other associations are unclear.
Conclusions:
- The relationship between alcohol and cardiovascular health is dose-dependent and complex.
- Light-moderate alcohol consumption may offer cardiovascular benefits, particularly for coronary artery disease.
- Further research is needed to clarify mechanisms and address methodological issues in alcohol-CV epidemiology.
Abstract:
For centuries, multiple medical risks of heavy alcohol drinking have been evident with simultaneous awareness of a less harmful or sensible drinking limit. The increased risks of heavy drinking, defined as three or more standard-sized drinks per day, are both cardiovascular (CV) and non-CV. The CV risks include the following: (i) alcoholic cardiomyopathy (ACM), (ii) systemic hypertension, (iii) atrial arrhythmias, (iv) haemorrhagic stroke and, probably, ischaemic stroke. By contrast, modern epidemiological studies have shown lower morbidity and mortality amongst light-moderate drinkers, due mostly to a reduced risk of coronary artery disease (CAD), with contributions from ischaemic stroke and heart failure (HF). A low level of alcohol drinking has no clear relation to increased risk of any CV condition, except for haemorrhagic stroke. There is good evidence that supports the existence of mechanisms by which alcohol might protect against CAD, but the mechanisms for other alcohol-CV associations remain unclear. Interrelationships amongst the CV conditions affect the individual alcohol-disease relationships; for example, lower CAD risk in light-moderate drinkers is to a large extent responsible for the reduced HF risk. International comparison data plus the presence of proposed beneficial nonalcohol components in wine (particularly in red wine) suggest that this beverage type might afford extra CAD protection. However, the effect of beverage choice is confounded by a healthier drinking pattern and more favourable risk traits in wine drinkers. Debate persists about methodological and public health issues related to the epidemiology of alcohol-related CV disease.
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