Abstract
Background
This study tested the hypothesis that median nerve stimulation (MNS) prevents ventricular arrhythmias (VAs) induced by dorsomedial hypothalamus stimulation (DMHS) and investigated the electrophysiological mechanisms underlying the anti-arrhythmic effects of MNS by recording left stellate ganglion activity (LSGA).
Methods
Eighteen rabbits were anesthetized, the median nerve was anchored by stimulating electrodes, and a bipolar electrode was implanted into the LSG to record nerve activity. The DMH was stimulated to induce arrhythmia. All animals underwent six repetitions of DMHS (30 s). The 18 rabbits were divided into the following 3 groups: a control group, which underwent only DMHS (n = 6); an MNS group, which underwent MNS during both the third and fourth DMHS repetitions (n = 6); and an LSGA-recording group, for which LSGA was recorded at baseline, immediately following DMHS and again immediately following MNS and DMHS (n = 6).
Results
Repeated DMHS-induced multiple VAs, in the rabbits. Compared with the DMHS-only group, the concurrent administration of MNS during DMHS significantly reduced the incidence of VAs (7 ± 3 and 9 ± 2 beats for the third and fourth DMHS + MNS repetitions vs. 29 ± 8 and 27 ± 9 beats for the first two DMHS repetitions, p < 0.05). The total duration of the abnormal discharges of the LSG (ADLSG) following MNS and DMHS was significantly reduced compared with that of the DMHS-only group (40 ± 18 vs. 14 ± 6 s, p < 0.05).
Conclusion
MNS reduced VAs induced by DMHS, which is thought to be mediated through suppressing of ADLSG.
New and noteworthy
Median nerve electrical stimulation prevented ventricular arrhythmias induced by DMHS through the mechanism of suppressing abnormal discharges of left stellate ganglion.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant 81270243 to Shu Zhang, 81300139 to Jingli Gu, 81441018 to Min Tang, and 1171088 to Ji-Min Cao) and Peking Union Medical College Innovation Fund (10023-1002-1008 to Shuang Zhao).
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Shuang Zhao and Min Tang contributed equally to this work.
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Zhao, S., Tang, M., Yuan, K. et al. Median nerve stimulation reduces ventricular arrhythmias induced by dorsomedial hypothalamic stimulation. J Interv Card Electrophysiol 47, 275–283 (2016). https://doi.org/10.1007/s10840-016-0150-5
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DOI: https://doi.org/10.1007/s10840-016-0150-5