Plasma microRNAs are associated with atrial fibrillation and change after catheter ablation (the miRhythm study)

UMMS Affiliation

Department of Medicine, Division of Cardiovascular Medicine; Department of Quantitative Health Sciences; Department of Surgery

Publication Date


Document Type



Adult; Aged; Atrial Fibrillation; Case-Control Studies; Catheter Ablation; Cohort Studies; Female; Gene Expression Regulation; Heart Atria; Humans; Male; MicroRNAs; Middle Aged; Prospective Studies


Cardiovascular Diseases | Translational Medical Research


BACKGROUND: MicroRNAs (miRNAs) are associated with cardiovascular disease and control gene expression and are detectable in the circulation.

OBJECTIVE: The purpose of this study was to test the hypothesis that circulating miRNAs may be associated with atrial fibrillation (AF).

METHODS: Using a prospective study design powered to detect subtle differences in miRNAs, we quantified plasma expression of 86 miRNAs by high-throughput quantitative reverse transcriptase-polymerase chain reaction in 112 participants with AF and 99 without AF. To examine parallels between cardiac and plasma miRNA profiles, we quantified atrial tissue and plasma miRNA expression using quantitative reverse transcriptase-polymerase chain reaction in 31 participants undergoing surgery. We also explored the hypothesis that lower AF burden after ablation would be reflected in the circulating blood pool by examining change in plasma miRNAs after AF ablation (n = 47).

RESULTS: Mean age of the cohort was 59 years; 58% of participants were men. Plasma miRs-21 and 150 were 2-fold lower in participants with AF than in those without AF after adjustment (P ≤.0006). Plasma levels of miRs-21 and 150 also were lower in participants with paroxysmal AF than in those with persistent AF (P

CONCLUSION: Cardiac miRs-21 and 150 are known to regulate genes implicated in atrial remodeling. Our findings show associations between plasma miRs-21 and 150 and AF, suggesting that circulating miRNAs can provide insights into cardiac gene regulation.


UMCCTS funding

DOI of Published Version



Heart Rhythm. 2015 Jan;12(1):3-10. doi: 10.1016/j.hrthm.2014.09.050. Epub 2014 Oct 9. Link to article on publisher's website

Journal/Book/Conference Title

Heart Rhythm

Related Resources

Link to article in PubMed

PubMed ID