TY - JOUR
T1 - Stellate ganglion stimulation causes spatiotemporal changes in ventricular repolarization in pig
AU - Meijborg, Veronique M. F.
AU - Boukens, Bastiaan J. D.
AU - Janse, Michiel J.
AU - Salavatian, Siamak
AU - Dacey, Michael J.
AU - Yoshie, Koji
AU - Opthof, Tobias
AU - Swid, Mohammed Amer
AU - Hoang, Jonathan D.
AU - Hanna, Peter
AU - Ardell, Jeffrey
AU - Shivkumar, Kalyanam
AU - Coronel, Ruben
PY - 2020/5
Y1 - 2020/5
N2 - Background: Dispersion in ventricular repolarization is relevant for arrhythmogenesis. Objective: The purpose of this study was to determine the spatiotemporal effects of sympathetic stimulation on ventricular repolarization. Methods: In 5 anesthetized female open-chest pigs, ventricular repolarization was measured from the anterior, lateral, and posterior walls of the left ventricle (LV) and right ventricle using up to 40 transmural plunge needles (4 electrodes each) before and after left stellate ganglion stimulation (LSGS) and right stellate ganglion stimulation. In addition, LSGS was performed in 3 pigs (2 male, 1 female) before and after verapamil (5–10 mg/h) administration. Results: LSGS yielded a biphasic response in repolarization in the lateral and posterior walls of the LV, with prolongation at ∼5 seconds (10 ± 1.5 ms) and shortening at 20–30 seconds of stimulation (–28.9 ± 4.4 ms) during a monotonic pressure increase. While the initial prolongation was abolished by verapamil, late shortening was augmented. Sequential transections of the vagal nerve and stellate ganglia augmented repolarization dispersion responses to LSGS in 2 of 5 hearts. An equal pressure increase by aortic occlusion resulted in a homogeneous shortening of repolarization in the LV, and the effects were smaller than those during LSGS. Right stellate stimulation shortened repolarization mainly in the anterior LV wall, but the effects were smaller than those of LSGS. Conclusion: LSGS first prolongs (through the L-type calcium current) and then shortens repolarization. The effect of LSGS was prominent in the posterior and lateral, not the anterior, LV walls.
AB - Background: Dispersion in ventricular repolarization is relevant for arrhythmogenesis. Objective: The purpose of this study was to determine the spatiotemporal effects of sympathetic stimulation on ventricular repolarization. Methods: In 5 anesthetized female open-chest pigs, ventricular repolarization was measured from the anterior, lateral, and posterior walls of the left ventricle (LV) and right ventricle using up to 40 transmural plunge needles (4 electrodes each) before and after left stellate ganglion stimulation (LSGS) and right stellate ganglion stimulation. In addition, LSGS was performed in 3 pigs (2 male, 1 female) before and after verapamil (5–10 mg/h) administration. Results: LSGS yielded a biphasic response in repolarization in the lateral and posterior walls of the LV, with prolongation at ∼5 seconds (10 ± 1.5 ms) and shortening at 20–30 seconds of stimulation (–28.9 ± 4.4 ms) during a monotonic pressure increase. While the initial prolongation was abolished by verapamil, late shortening was augmented. Sequential transections of the vagal nerve and stellate ganglia augmented repolarization dispersion responses to LSGS in 2 of 5 hearts. An equal pressure increase by aortic occlusion resulted in a homogeneous shortening of repolarization in the LV, and the effects were smaller than those during LSGS. Right stellate stimulation shortened repolarization mainly in the anterior LV wall, but the effects were smaller than those of LSGS. Conclusion: LSGS first prolongs (through the L-type calcium current) and then shortens repolarization. The effect of LSGS was prominent in the posterior and lateral, not the anterior, LV walls.
KW - Autonomic nervous system
KW - Heterogeneity
KW - Repolarization
KW - Stellate ganglion
KW - T-wave
UR - http://www.scopus.com/inward/record.url?scp=85080990730&partnerID=8YFLogxK
U2 - https://doi.org/10.1016/j.hrthm.2019.12.022
DO - https://doi.org/10.1016/j.hrthm.2019.12.022
M3 - Article
C2 - 31917369
SN - 1547-5271
VL - 17
SP - 795
EP - 803
JO - Heart Rhythm
JF - Heart Rhythm
IS - 5
ER -