Alcohol may worsen heart arrhythmia
Study says even light consumption may increase risk in those with history of condition
A new study has found that consuming alcohol, even as little as one can of beer or one glass of wine, can quickly increase the risk of a common type of cardiac arrhythmia known as atrial fibrillation in people who have a history of the condition.
Doctors have long suspected a link between alcohol and atrial fibrillation, but until now, they did not have definitive evidence that alcohol could cause arrhythmias. The new study is among the most rigorous to date: The researchers recruited 100 people with a history of atrial fibrillation and tracked them intensely for four weeks, monitoring their alcohol intake and their cardiac rhythms in real time.
The scientists found that drinking alcohol heightened the odds that a person would have an episode of atrial fibrillation, or an abnormal heart rhythm, within the next few hours. And the more they drank, the greater their likelihood of having an arrhythmia. The new study was published last week in the Annals of Internal Medicine. The conclusions, along with data from previous studies, suggest that people with a history of atrial fibrillation could reduce their chances of developing arrhythmias by cutting back on alcohol or avoiding it altogether.
The authors speculated that the findings could have broader implications for healthy adults as well. Although moderate drinking is widely considered beneficial for heart health, the new research suggests that, at least in some people, it could potentially disrupt how the heart functions. “This demonstrates that whenever we consume alcohol, it is presumably having a nearly immediate effect on the electrical workings of our hearts,” said Dr. Gregory Marcus, an author of the study and a professor of medicine in the division of cardiology at the University of California, San Francisco.
Atrial fibrillation, also known as A-fib, is the most commonly occurring heart rhythm abnormality, affecting an estimated 3 million adults in the United States. It occurs when the upper chambers of the heart, the atria, start beating irregularly, which can disrupt blood flow to the lower chambers of the heart, called the ventricles. Over time, it can lead to complications like heart failure and strokes. A-fib can be persistent, or it can occur sporadically, with symptoms such as palpitations, shortness of breath and fatigue that last for a few minutes or hours at a time. When the episodes occur occasionally, the condition is known as paroxysmal atrial fibrillation.
People have a greater chance of developing atrial fibrillation as they get older. It’s also more likely to occur in people who have risk factors such as high blood pressure, heart disease, obesity, European ancestry or a family history of arrhythmias. About four decades ago, doctors began documenting cases of people experiencing arrhythmias after bouts of heavy drinking on weekends and holidays, a phenomenon that came to be known as holiday heart syndrome. Since then, a number of large observational studies have found that people who regularly consume alcohol, even as little as one drink a day, have an increased likelihood of going on to develop atrial fibrillation compared with people who abstain.