Reducing your intake of alcohol might improve atrial fibrillation (AFib), a common type of irregular heartbeat, according to an Australian study in The New England Journal of Medicine. It found that moderate to heavy drinkers with AFib—a leading cause of stroke—who lowered their alcohol intake had fewer episodes of arrhythmias (abnormal heart rhythms) when measured against those who didn’t change their drinking habits.
...
It's worth noting that the original length of the clinical trial was slated to be one year. However, the researchers couldn’t recruit enough participants to commit to abstinence for that long, so the trial length was shortened to six months. Longer trials are needed to see whether the positive effects persist.

However, after enrolling just 81 patients, the researchers saw some concerning signs. Within a few days of starting the treatment, more patients in the high dose group experienced heart rhythm problems than did those in the low dose group. And two patients in the high dose group developed a fast, abnormal heart rate known as ventricular tachychardia before they died.