Recent research, published on December 14, 2024, in the Journal of the American Heart Association—a peer-reviewed, open-access journal of the American Heart Association—suggests that consuming several cups of coffee daily may be beneficial in staving off cognitive decline in individuals diagnosed with atrial fibrillation (AFib or AF). This groundbreaking study, led by Jürg H. Beer, M.D., senior author and a professor of medicine and hematology at the University of Zürich, Switzerland, challenges existing myths surrounding caffeine consumption in patients with AFib. According to Dr Beer, there is no evidence to suggest that patients with AFib should avoid coffee; on the contrary, he advises them to relish their coffee drinking, as it might prove beneficial.
Atrial fibrillation, the most prevalent heart rhythm disorder among adults, impacts over five million individuals in the U.S. alone. Notably, the 2023 ACC/AHA/ACCP/HRS Guideline for the Diagnosis and Management of Atrial Fibrillation indicates that avoiding caffeine does not benefit those with AFib in preventing heart rhythm disturbances. However, the guideline does acknowledge that abstaining from coffee could mitigate symptoms for those who find that caffeine exacerbates their AFib symptoms, such as rapid heartbeat, dizziness, and fatigue.
Dr Massimo Barbagallo, M.D., lead author of the study and a resident in the neuro intensive care unit at the University Hospital Zürich, points out that while regular coffee consumption has been shown to enhance cognitive performance among healthy individuals, atrial fibrillation itself independently heightens the risk of dementia. The critical question raised by the study is whether coffee consumption could counteract this increased risk of cognitive impairment in those with AFib.
The U.S. federal dietary guidelines suggest that three to five 8-ounce cups of plain black coffee daily can form part of a healthy diet. However, the American Heart Association cautions against high-calorie, sugary coffee-based beverages like lattes and macchiatos. The Swiss Atrial Fibrillation Cohort Study (Swiss-AF), which includes over 2,400 Swiss participants diagnosed with AFib, has provided significant insights into this query. Participants in this study, enrolled between 2014 and 2017, underwent several cognitive tests and reported their coffee consumption over the past year. Interestingly, the study found that higher mental test scores were consistently associated with higher coffee consumption, particularly in processing speed, visuomotor coordination, and attention. Cognitive age was calculated to be 6.7 years younger among those who consumed the most coffee than those who consumed the least. Additionally, inflammatory markers, which are linked with Alzheimer’s disease and AFib due to their association with systemic inflammation, were over 20% lower in participants who drank five cups daily compared to those who drank less than one cup.
Despite these findings, José A. Joglar, M.D., FAHA, chair of the 2023 joint guideline on managing atrial fibrillation, emphasizes that this observational study cannot definitively conclude that coffee prevents long-term cognitive decline. While other studies have broadly demonstrated coffee’s cognitive-enhancing capabilities, these findings are not specific to the AFib population. Dr Joglar advises that, although there is no need to discontinue coffee consumption, starting to drink coffee to prevent AFib or cognitive decline should not be recommended based on this study alone.
Considering the study’s limitations, the research concurrently assessed participants’ cognitive ability and coffee consumption. This approach does not allow observing cognitive decline over time or changes in coffee consumption habits. As such, while the study offers promising data, it cannot establish a causal relationship between coffee drinking and improved cognitive performance. Additionally, the study may not be generalizable to broader populations, as it primarily involved a mostly white demographic in Switzerland, where espresso is the prevalent form of coffee consumed.
In conclusion, the study underscores the potential benefits of coffee consumption in mitigating cognitive decline associated with atrial fibrillation. However, it also highlights the need for longitudinal studies to fully understand the impact of coffee on cognitive health in this specific patient population. The insights provided by such research could be invaluable in shaping dietary recommendations and therapeutic approaches for those suffering from AFib, potentially altering the conventional wisdom regarding caffeine and heart health.
More information: Massimo Barbagallo et al, Coffee Consumption Correlates With Better Cognitive Performance in Patients With a High Incidence for Stroke, Journal of the American Heart Association. DOI: 10.1161/JAHA.124.034365
Journal information: Journal of the American Heart Association Provided by American Heart Association
