A new meta-analysis looked at whether genetic ancestry influences the risk of developing atrial fibrillation, a common heart rhythm problem. Researchers combined data from four large studies, including the UK Biobank, and focused on people of Black ethnicity. In the UK Biobank group of 6,920 participants, 205 people (3%) developed atrial fibrillation over a median follow-up of 13.7 years. For every 10% increase in European genetic ancestry, the risk of atrial fibrillation was 7% higher, but this result was not statistically significant, meaning it could be due to chance.
When the researchers pooled results from all four studies, they found a 9% higher risk with more European ancestry, but again, this was not statistically significant. However, when they excluded one study (the Women's Health Initiative), the link became stronger and statistically significant: a 14% higher risk per 10% increase in European ancestry.
The main limitation is that the studies were quite different from each other, which makes the combined results less reliable. This is an observational analysis, so it cannot prove that ancestry itself causes atrial fibrillation. Other factors, like social or environmental influences, might explain the link.
For now, this research suggests a possible genetic component to atrial fibrillation risk in people of Black ethnicity, but it is not strong enough to change medical practice. If you have concerns about your heart health, talk to your doctor.
