Binge Drinking Found to Impair Vascular Function in Healthy Young Adults
Researchers at the University of Illinois at Chicago compared 19 men and women ages 18 to 25 years with normal serum lipoproteins, triglycerides, CRP, glucose, and insulin levels who had a history of binge drinking to 17 healthy young adults in the same age range who consumed no more than five drinks within the last year (abstainers). Binge drinking was defined as having five or more standard alcoholic drinks within two hours for men, and four or more standard drinks within two hours for women. The binge drinkers in this study had an average of six binge-drinking episodes within the past month and an average four years of binge-drinking behavior.Results found that the binge drinkers had significantly lower brachial artery endothelial-dependent flow-mediated vasodilation (FMD) (8.4 percent lower; p=0.022) and nitroglycerin-mediated dilation (NTG) (19.6 percent lower; p=0.009) 24 to 96 hours after the most recent binge-drinking episode, compared to abstainers. The FMD impairments are equivalent to those found in individuals who have a lifetime history of daily heavy alcohol consumption (> 6 drinks/day for > 8 years), the researchers said. In addition, the reductions in NTG dilations suggest that there could be "reduced smooth muscle cell responses to NO and altered post-receptor signal transduction events, such as alterations in the cyclic guanosine monophosphate pathway." There were no differences between groups in terms of blood pressure, lipoproteins, and Creactive protein.
Moving forward, the study authors suggest a potential need to screen young adults for a history of binge drinking when looking at risk factors for cardiovascular disease. Robert A. Vogel, MD, FACC, writes in an accompanying JACC editorial that additional studies should also look at moderate, steady young drinkers and study the time course of vascular function immediately after cessation of intake, as well as after longer abstinence — something the current study does not explore. "Why alcohol, a vasodilator, might cause a persistent vasoconstrictive state days after cessation of intake remains unclear," he notes.
Keywords: Insulin, Vasodilation, Brachial Artery, Ethanol, Guanosine Monophosphate, Lipoproteins, Respiratory Insufficiency, Binge Drinking, Risk Factors, Blood Pressure, Vasodilator Agents, Cyclic GMP, Signal Transduction, Glucose, Myocytes, Smooth Muscle, Chicago, Cardiovascular Diseases, Triglycerides, United States, Nitroglycerin
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