Abstract
Aims
Atrial ganglionated plexi (GP) have been shown to modulate atrial electrophysiology and play an important role in atrial fibrillation initiation and maintenance. The purpose of this study was to investigate the effects of atrial GP stimulation (GPS) on ventricular refractoriness, restitution properties and electrical alternans.
Methods
In 12 anesthetized dogs, two multiple electrode catheters were sutured at left and right ventricular free walls for recording. Monophasic action potentials were recorded from six epicardial ventricular sites. Ventricular effective refractory period (ERP), action potential duration (APD) restitution properties and APD alternans were measured at baseline and during GPS.
Results
Compared with baseline, GPS significantly prolonged ventricular ERP and APD at all sites and decreased their spatial dispersions (P < 0.05 for all). GPS also significantly flattened ventricular restitution curves and decreased the maximal slope of restitution curves at each site (P < 0.05 for all). APD alternans occurred at shorter pacing cycle length at each site during GPS when compared with baseline (P < 0.05 for all).
Conclusions
GPS prolonged ventricular ERP, decreased the slope of restitution curves and delayed APD alternans, indicating that GPS may exert a protective role for ventricular arrhythmias.
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Acknowledgments
This work was supported by grants 81270250 (ZL), 81270339 (HJ, LY), 81100128 (BC) and 81070143 (ZL, HJ) from National Natural Science Foundation of China, grant 4101024 from the Fundamental Research Funds for the Central Universities (ZL) and the Specialized Research Fund for the Doctoral Program of Higher Education of China (No. 20100141120072, ZL) and Wuhan Planning Project of Science and Technology (No. 201271031429, ZL).
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Bo He and Zhibing Lu contributed equally to this work.
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He, B., Lu, Z., He, W. et al. The effects of atrial ganglionated plexi stimulation on ventricular electrophysiology in a normal canine heart. J Interv Card Electrophysiol 37, 1–8 (2013). https://doi.org/10.1007/s10840-012-9774-2
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DOI: https://doi.org/10.1007/s10840-012-9774-2