Most people are familiar with alcohol’s negative impacts on the brain, liver, and kidneys, but many do not understand the risks that alcohol abuse carries for the heart. These risks are exacerbated by the amount of alcohol a user consumes and the frequency of consumption.

Healthy Heart Functions

In order to understand the way alcohol abuse affects the heart, it’s important to understand how the human heart is constructed. The heart is comprised of four chambers: two upper chambers known as atria and two lower chambers referred to as ventricles. These four chambers allow blood to flow through the heart in one direction at any given time. In order for this process to stay consistent, the four chambers must beat in an organized rhythm.

With each heartbeat, the human heart pumps blood out of its four chambers and through the body’s circulatory system. Although that pace may fluctuate based on a person’s health or physical activity, the rhythm largely stays consistent. Health concerns arise when the pace of a heartbeat becomes erratic or irregular.

Cardiac Arrhythmia

The term “arrhythmia” refers to any irregularity in a heartbeat that disrupts the typical organized rhythm of the heart’s beating. Although many people experience very brief arrhythmias, such as a quickened heartbeat or a temporary pause, these small disruptions don’t impact the human heart rate in a significant way. The heart cannot pump blood effectively, however, when such an irregularity continues for an extended period of time.

Types of Cardiac Arrhythmia

  • Premature atrial contractions. These are early extra beats that start in the heart’s upper chambers, called the atria. …
  • Premature ventricular contractions (PVCs). …
  • Atrial fibrillation. …
  • Atrial flutter. …
  • Paroxysmal supraventricular tachycardia (PSVT). …
  • Accessory pathway tachycardias.


A heart rate exceeding 100 beats per minute is referred to as tachycardia, while a heart rate below 60 beats per minute is called bradycardia. Since the heart is responsible for carrying blood and oxygen to the rest of the body, these conditions can contribute to several significant health problems.

A single or short series of irregular beats may be felt as a palpitation or fluttering sensation, whereas a longer lasting arrhythmia can result in fatigue, chest pain, lightheadedness or even cardiac arrest.

The most common treatment for arrhythmia in older patients is the installation of a pacemaker. These small devices are implanted and send regular electrical pulses to keep the heart beating regularly. In other cases, a doctor may prescribe blood pressure medication.


Atrial Fibrillation

Alcohol abuse poses a unique threat to heart health because it increases a person’s risk of atrial fibrillation, a quivering in the atria chambers of the heart, by 60%. This dangerous form of arrhythmia makes the heart incapable of effectively moving blood into the heart’s ventricles. As a result, individuals suffering from the condition are more vulnerable to blood clots, strokes, heart failures and other life-threatening complications.

Other health concerns can compound this heart risk, so it is vital to understand alcohol’s full effects on the body and interactions with other health complications.

Complications from Atrial Fibrillation

According to the American Heart Association, roughly 15-20% of people who suffer strokes also have atrial fibrillation. If a blood clot breaks loose and enters the bloodstream, it can lodge inside an artery that leads to the brain and causes a stroke. Typically, doctors treat the condition with blood thinners to prevent this possibility.

A recent study from the Karolinska Institute in Stockholm, Sweden found significant links between alcohol abuse and an increased risk of developing atrial fibrillation. When comparing total alcohol use, the researcher discovered the following:

  • Consuming1 to 6 alcoholic drinks in one week increases the drinker’s chances of developing atrial fibrillation by 6%
  • 7 to 14 drinksincreases the risk by 12%
  • 14 or more drinksincreases the risk by 18%

The study also analyzed the effects of various types of alcohol. When subjects only drank wine, the results showed:

  • 1 to 6 glasses of winein one week only increased the risk of developing atrial fibrillation by 2%
  • 7 to 14 glasses of winein one week generated a 7% increased risk
  • More than 14 glassesin one week increased the risk by 35%

For subjects who drank only beer, the results were different, and somewhat counter-intuitive:

  • 1 to 6 beers in one weekdid not increase the risk of developing atrial fibrillation by a measurable amount
  • 7 to 14 beers in one weekincreased the risk by 11%                                                                                               
  • 14 or more beers in one weekonly showed a 3% increased risk

Finally, the researchers compared the effects of liquor:

  • 1 to 6 drinksled to a 5% increased risk of developing atrial fibrillation
  • 7 to 14 drinksled to a 14% increased risk
  • 14 or more drinks per weekincreased the risk of developing atrial fibrillation by a staggering 46%.
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