Caffeine does not increase the risk of atrial fibrillation: a systematic review and meta-analysis of observational studies
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Published on: February 26, 2013
Daniel Caldeira1, Cristina Martins, Luís Brandão Alves
1Laboratory of Clinical Pharmacology and Therapeutics, Faculty of Medicine, University of Lisbon, Lisboa, Portugal. dgcaldeira@hotmail.com
Insights
Caffeine consumption does not increase the risk of atrial fibrillation (AF). Low-dose caffeine intake may even offer a protective effect against AF, according to a meta-analysis of observational studies.
Area of Science:
- Cardiology
- Epidemiology
- Pharmacology
Background:
- Atrial fibrillation (AF) is a common heart arrhythmia with established risk factors.
- Previous research on caffeine's association with AF risk has yielded inconsistent results.
Purpose of the Study:
- To systematically evaluate the relationship between chronic caffeine exposure and the risk of developing atrial fibrillation.
- To synthesize existing observational data to clarify caffeine's role in AF etiology.
Main Methods:
- A systematic review and meta-analysis of observational studies were conducted.
- Searches of major databases (PubMed, CENTRAL, ISI Web of Knowledge, LILACS) up to December 2012 identified relevant studies.
- Data from seven observational studies, including 115,993 participants, were analyzed using random-effects models.
Main Results:
- Overall caffeine exposure was not associated with an increased risk of AF (OR 0.92, 95% CI 0.82 to 1.04).
- High-quality studies indicated a potential 13% reduction in AF risk with caffeine consumption (OR 0.87, 95% CI 0.80 to 0.94).
- Low-dose caffeine intake demonstrated a significant protective effect (OR 0.85, 95% CI 0.78 to 0.92) with no heterogeneity.
Conclusions:
- Caffeine exposure is not linked to a higher risk of atrial fibrillation.
- Low-dose caffeine consumption may exert a protective influence on AF development.
- Further research into dose-dependent effects of caffeine on cardiovascular health is warranted.
Background:
Atrial fibrillation (AF) is the most prevalent sustained arrhythmia, and risk factors are well established. Caffeine exposure has been associated with increased risk of AF, but heterogeneous data exist in the literature.
Objective:
To evaluate the association between chronic exposure to caffeine and AF.
Design:
Systematic review and meta-analysis of observational studies.
Data Sources:
PubMed, CENTRAL, ISI Web of Knowledge and LILACS to December 2012. Reviews and references of retrieved articles were comprehensively searched.
Study Selection:
Two reviewers independently searched for studies and retrieved their characteristics and data estimates.
Data Synthesis:
Random-effects meta-analysis was performed, and pooled estimates were expressed as OR and 95% CI. Heterogeneity was assessed with the I(2) test. Subgroup analyses were conducted according to caffeine dose and source (coffee).
Results:
Seven observational studies evaluating 115 993 individuals were included: six cohorts and one case-control study. Caffeine exposure was not associated with an increased risk of AF (OR 0.92, 95% CI 0.82 to 1.04, I(2)=72%). Pooled results from high-quality studies showed a 13% odds reduction in AF risk with lower heterogeneity (OR 0.87; 95% CI 0.80 to 0.94; I(2)=39%). Low-dose caffeine exposure showed OR 0.85 (95% CI 0.78 to 92, I(2)=0%) without significant differences in other dosage strata. Caffeine exposure based solely on coffee consumption also did not influence AF risk.
Conclusions:
Caffeine exposure is not associated with increased AF risk. Low-dose caffeine may have a protective effect.
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