How can alcohol cause atrial fibrillation ?

Excess alcohol : Heavy drinking iver time can lead to cardiomyopathy as alcohol works as a myocardial suppressant but even in smaller but usually excessive quantities it can cause atrial fibrillation due to its dehydrating and electrolyte depleting effects. This is often referred to as "holiday heart".

Alcohol=toxic : Excessive alcohol can be toxic to your body including the heart. The cardiac cells that make up the sinus node (the automatic pacemaker) on the top part of your heart, as well as the rest of the heart are subject to the toxic effect of alcohol and thus can fibrillate(shaky) just as your brain cells do that make you unable to walk-a-straight-line test! cut it down. Drink responsibly. Good luck.