Why do Black people have lower rates of atrial fibrillation (AFib) but higher stroke risks when they do have AFib?

Atrial fibrillation (AFib) is a condition where the heart beats irregularly and often rapidly. It's more common as people age. Interestingly, studies have shown that Black people in America have lower rates of AFib compared to white people. For example, one study found that 2.5% of Black people had AFib compared to 7.8% of white people. Despite having risk factors like obesity, high blood pressure, and diabetes, which are common in Black individuals, they still have lower rates of AFib. This phenomenon is known as the “atrial fibrillation paradox.” Researchers believe there might be other factors, possibly genetic, that protect Black people from AFib. However, it's also possible that white people have additional, yet unidentified, risk factors for AFib. Even though Black people have lower rates of AFib, they face higher risks of complications like stroke if they do get AFib. Studies suggest that Black individuals with AFib are more likely to have a stroke compared to white individuals. Therefore, it's crucial for Black people to get diagnosed and treated for AFib to reduce the risk of stroke and other health issues. Regardless of race, anyone with AFib or concerns about it should consult a doctor for proper diagnosis and treatment.