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Published on: February 26, 2013
Serum electrolyte concentrations and risk of atrial fibrillation: an observational and mendelian randomization study
Yang Wu1,2, Xiang-Jun Kong1,2, Ying-Ying Ji1,2
1Department of Cardiology, the First Affiliated Hospital, Sun Yat-Sen University, Guangzhou, China.
Insights
Electrolyte imbalances, including low potassium, low magnesium, and high phosphate, are linked to increased atrial fibrillation (AF) risk. However, these electrolyte levels do not appear to causally influence AF development.
Area of Science:
- Cardiology
- Electrophysiology
- Public Health
Background:
- Atrial fibrillation (AF) is a common arrhythmia linked to high mortality and stroke risk.
- Electrolyte imbalances are suspected contributors to AF, but their precise relationship is not fully understood.
Purpose of the Study:
- To investigate the association between serum electrolyte levels and the risk of developing atrial fibrillation.
- To explore potential causal links between serum electrolytes and AF using Mendelian randomization.
Main Methods:
- An observational study of 15,792 individuals from the Atherosclerosis Risk in Communities (ARIC) study.
- Cox regression models were used to assess hazard ratios for AF based on serum electrolyte levels.
- Mendelian randomization analyses were conducted to evaluate causal associations.
Main Results:
- Low serum potassium and magnesium, and high serum phosphate were associated with an increased risk of AF.
- Serum calcium levels showed no significant association with AF risk.
- Mendelian randomization analyses did not support a causal relationship between genetically predicted serum electrolyte levels and AF.
Conclusions:
- Serum electrolyte disorders like hypokalemia, hypomagnesemia, and hyperphosphatemia are associated with increased AF risk and may be prognostic factors.
- The study did not find evidence that serum electrolytes causally mediate AF development.
Background:
Atrial fibrillation (AF) is a prevalent arrhythmic condition resulting in increased stroke risk and is associated with high mortality. Electrolyte imbalance can increase the risk of AF, where the relationship between AF and serum electrolytes remains unclear.
Methods:
A total of 15,792 individuals were included in the observational study, with incident AF ascertainment in the Atherosclerosis Risk in Communities (ARIC) study. The Cox regression models were applied to calculate the hazard ratio (HR) and 95% confidence interval (CI) for AF based on different serum electrolyte levels. Mendelian randomization (MR) analyses were performed to examine the causal association.
Results:
In observational study, after a median 19.7 years of follow-up, a total of 2551 developed AF. After full adjustment, participants with serum potassium below the 5th percentile had a higher risk of AF relative to participants in the middle quintile. Serum magnesium was also inversely associated with the risk of AF. An increased incidence of AF was identified in individuals with higher serum phosphate percentiles. Serum calcium levels were not related to AF risk. Moreover, MR analysis indicated that genetically predicted serum electrolyte levels were not causally associated with AF risk. The odds ratio for AF were 0.999 for potassium, 1.044 for magnesium, 0.728 for phosphate, and 0.979 for calcium, respectively.
Conclusions:
Serum electrolyte disorders such as hypokalemia, hypomagnesemia and hyperphosphatemia were associated with an increased risk of AF and may also serve to be prognostic factors. However, the present study did not support serum electrolytes as causal mediators for AF development.
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