Abstract
Objective
We investigated the relation between the endothelin system and atrial fibrillation.
Background
Endothelin has been implicated in the pathophysiology of atrial fibrillation, but the exact role of A- and B-receptors is unknown.
Methods
We obtained right atrial biopsies from patients in sinus rhythm and preserved left ventricular function, undergoing off-pump coronary artery bypass grafting. The expression of endothelin, A- and B-receptors was measured using real time reverse-transcribed polymerase chain reaction.
Results
We studied 52 patients (45 male, mean age 66 ± 1 years, mean ejection fraction 52 ± 1%). During a 5-day post-operative period, persistent atrial fibrillation occurred in 15 patients (28.8%). Endothelin mRNA expression was comparable in patients who subsequently developed atrial fibrillation and in those maintaining sinus rhythm. However, the former group displayed down-regulation of endothelin A- (by approximately 60%, p = 0.0059) and of B-receptors (by approximately 40%, p = 0.0084). The decreased endothelin A-receptor expression could predict atrial fibrillation occurrence (Wilks λ = 0.86, F = 6.16, p = 0.017).
Conclusion
Decreased endothelin A- and B-receptor expression is associated with atrial fibrillation after bypass surgery.
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Acknowledgements
Paraskevi Lioni, BSc, offered invaluable help as a research coordinator. We are grateful to our patients for their participation in the study.
Funding
This work was supported by two grants from the Hellenic Ministry of Development, General Council for Research and Technology (1st Project: PENED Prosmeno-7034-05/21/2001 and 2nd Project: Operational Program for Competitiveness, Axis 4-Measure 4.5, EPAN 2002, Hercules).
Disclosures
Conflict of Interest: None declared.
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Theofilos M. Kolettis and Zenon S. Kyriakides contributed equally to the study.
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Kolettis, T.M., Kyriakides, Z.S., Zygalaki, E. et al. Endothelin system and atrial fibrillation post-cardiac surgery. J Interv Card Electrophysiol 21, 203–208 (2008). https://doi.org/10.1007/s10840-008-9206-5
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DOI: https://doi.org/10.1007/s10840-008-9206-5