Is atrial fibrillation dangerous, and what can I do about it?
Atrial fibrillation substantially increases your risk of death, heart failure, and stroke, and requires active treatment. Discuss blood thinners for stroke prevention with your doctor, as well as which lifestyle changes are worthwhile in your specific situation.
Atrial fibrillation is a heart rhythm disorder in which the atria beat chaotically. That may sound harmless, but large-scale research involving nearly 9.7 million people shows that having atrial fibrillation gives you a 46% higher chance of dying than people without the condition. Doctors are therefore right to take it seriously.
The greatest risk is heart failure: the likelihood of that is almost five times higher than with a normal heart rhythm. The risk of a stroke caused by a blood clot is also more than doubled. Women with the condition have a stroke more often than men with the same diagnosis, and also die from it more often. In addition, atrial fibrillation is associated with a 64% higher chance of chronic kidney disease. In people who also have diabetes, the risk of a foot amputation appears to more than quadruple, but that comes from a single large Korean study and still needs to be confirmed1.
The most well-proven way to prevent a stroke is the use of blood thinners2,3,4. Modern agents that do not work via vitamin K are included in this category. Your doctor will decide together with you which medication is appropriate, because blood thinners themselves also increase the risk of bleeding. That requires a tailored approach.
There is also reasonably good evidence that lifestyle changes help, although long-term studies are still scarce5. Losing weight if you are overweight, exercising more, drinking less alcohol, quitting smoking, getting sleep apnea treated, and keeping your blood pressure well controlled can reduce symptoms. This is seen as a fourth pillar alongside the conventional medications.
Finally: atrial fibrillation is also the most common complication after heart surgery. If you are about to undergo a cardiac procedure, ask your doctor in advance about the prevention and treatment of this risk.
All claims come from observational cohort studies and a large meta-analysis (PMID 27599725, ~9.7 million participants). The associations are associative, not formally proven to be causal, but the size and consistency of the evidence are substantial. The evidence for blood thinners is based on guideline literature and clinical studies (PMID 29028452, 33846159, 20031792). The lifestyle evidence is more limited (PMID 36598428). The finding on foot amputation in diabetes and atrial fibrillation comes from a single study (PMID 37851370) and requires confirmation.