What does alcohol do to heart rate?

In the short-term:

- Low to moderate alcohol consumption: may cause a slight decrease in heart rate

In the long-term:

- Chronic heavy alcohol consumption: may cause an increase in heart rate (tachycardia) and changes in the structure and function of the heart, including alcoholic cardiomyopathy.

Mechanisms:

- Vasodilation: Alcohol causes dilation of blood vessels, which reduces blood pressure. The heart does not need to pump as hard, so the heart rate slows down.

- Stimulation of the vagus nerve: Alcohol stimulates the vagus nerve, which slows down the heart rate.

- Cardiotoxic effects: Chronic heavy alcohol consumption can damage the heart muscle, leading to an increase in heart rate and other heart problems.