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- W1620452307 abstract "Introduction: Atrial Fibrillation (AF) is the most common arrhythmia in clinical practice. MicroRNAs (miRs) are small RNAs that play a role in regulating cardiac remodeling and have been implicated in cardiac arrhythmogenesis. However, few studies have examined the association of atrial miR expression to AF. Hypothesis: Changes in miR expression (estimated as fold-difference in the delta cycle threshold compared to global mean) in human atria can be associated with AF. Methods: Thirty-one consecutive patients undergoing elective cardiac surgery were divided into 2 groups: those with history of AF (n=19) and those with no history of AF who stayed in sinus rhythm post-operatively (n=12). Atrial tissue samples were obtained from the right atrium in all but one (left atrium). Based on pilot data and prior literature, the expression of 82 miRs was assessed using high-throughput quantitative reverse-transcriptase polymerase chain reaction. We used logistic regression adjusting for age and sex to detect the associations between levels of atrial miRs and AF. Results: The mean age of the sample was 65 years (±13) and 71% were men. A history of coronary artery disease and heart failure was present in 42% and 36%, respectively. Among AF subjects, the age- and sex- adjusted odds ratios for the expression of miRs 411-5p, 21-5p, 409-3p and 320a were 0.08 (p= 0.02), 0.20 (p=0.02), 0.13 (p= 0.04) and 0.04 (p=0.048), respectively, compared to no AF. The fold-difference in atrial expression of miRs 411-5p, 21-5p, 409-3p and 320a were -0.567, -0.588, -0.375 and -0.427, respectively, in those with AF compared to no AF. Conclusion: In our study, the atrial expression of miRs 411, 21, 409 and 320 was lower in AF patients compared to those with no AF. Notably, these miRs regulate genes involved in atrial fibrosis, apoptosis, and ion channel function. Our findings further implicate miRs as important mediators of pathological atrial remodeling and suggest their usefulness as biomarkers in detecting AF." @default.
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- W1620452307 date "2014-11-25" @default.
- W1620452307 modified "2023-10-02" @default.
- W1620452307 title "Abstract 12750: Atrial Tissue MicroRNAs 411-5p, 21-5p, 409-3p and 320a Are Associated With Atrial Fibrillation" @default.
- W1620452307 doi "https://doi.org/10.1161/circ.130.suppl_2.12750" @default.
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