The online version of this article (doi:10.1186/1471-2261-14-107) contains supplementary material, which is available to authorized users.
The authors declared that they have no competing interests.
PN and GE conceived of the study. All authors participated in study design. LJ carried out analyses with the participation of GE and drafted the manuscript. All authors contributed equally. All authors revised and approved the final manuscript.
Type 2 diabetes has been associated with increased incidence of atrial fibrillation (AF) and cardiovascular disease. Controversy remains regarding the role of insulin in the epidemiology of AF risk. The aim of the present study was to study the association between fasting plasma insulin (FPI) and incidence of AF, as well as any effect modification by fasting blood glucose (FBG) or 2 h post-load blood glucose and body mass index (BMI).
The study population consisted of 6052 men and 1014 women followed for an average of 26.2 years. There were 983 cases of incident AF. Analysis was performed using Cox regression and competing risks regression approaches. The population was analysed as a whole, and by subgroups according to glucose levels and BMI.
After adjustment for age, height, weight, systolic blood pressure and smoking there was a significant inverse association between FPI and AF (hazard ratio; HR) for 4th vs. 1st quartile: 0.69 (95% confidence interval (CI): 0.57-0.83, p < 0.0001) in the cohort as a whole. Among men the corresponding values were HR 0.64 (95% CI 0.52-0.78, p < 0.001) and among women HR 1.16 (95% CI 0.69-1.93, p = 0.58); p-value for interaction 0.06. The protective effects of insulin tended to be weaker in subjects with elevated fasting glucose, implying that the relation between FPI and incident AF could be dependent on the status of individual’s glucose metabolism.
High levels of FPI are associated with lower risk of incident AF in a middle-aged population with a long follow-up.
Additional file 1: Table S1. Hazard ratios per unit increase in ln fP-Insulin and incidence of AF analysed with Cox regression; subgroups by fasting blood glucose (FBG). Table S2. Hazard Ratios per unit increase in ln fP-Insulin and incidence of AF, stratified by quartile of BMI. Table S3. Baseline characteristics, comparison between men and women. (DOCX 20 KB)
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- Low fasting plasma insulin is associated with atrial fibrillation in men from a cohort study - the Malmö preventive project
Linda SB Johnson
Peter M Nilsson
- BioMed Central
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