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- W2916017003 abstract "Background High output subcutaneous nerve stimulation (ScNS) remodels the stellate ganglia and suppresses cardiac arrhythmia. Objective The purpose of this study was to test the hypothesis that long duration low output ScNS causes cardiac nerve sprouting and increases plasma norepinephrine concentration and the duration of paroxysmal atrial tachycardia (PAT) in ambulatory dogs. Methods We prospectively randomized 22 dogs (11 males and 11 females) into 5 different output groups for 2 months of ScNS: 0 mA (sham) (n = 6), 0.25 mA (n = 4), 1.5 mA (n = 4), 2.5 mA (n = 4), and 3.5 mA (n = 4). Results As compared with baseline, the changes in the durations of PAT episodes per 48 hours were significantly different among different groups (sham, −5.0 ± 9.5 seconds; 0.25 mA, 95.5 ± 71.0 seconds; 1.5 mA, −99.3 ± 39.6 seconds; 2.5 mA, −155.3 ± 87.8 seconds; and 3.5 mA, −76.3 ± 44.8 seconds; P < .001). The 3.5 mA group had a greater reduction in sinus heart rate than did the sham group (−29.8 ± 15.0 beats/min vs −14.5 ± 3.0 beats/min; P = .038). Immunohistochemical studies showed that the 0.25 mA group had a significantly increased while 2.5 mA and 3.5 mA stimulation had significantly reduced growth-associated protein 43 nerve densities in both atria and ventricles. The plasma norepinephrine concentrations in the 0.25 mA group was 5063.0 ± 4366.0 pg/mL, which was significantly higher than that in the other groups of dogs (739.3 ± 946.3; P = .009). There were no significant differences in the effects of simulation between males and females. Conclusion In ambulatory dogs, low output ScNS causes cardiac nerve sprouting and increases plasma norepinephrine concentration and the duration of PAT episodes while high output ScNS is antiarrhythmic. High output subcutaneous nerve stimulation (ScNS) remodels the stellate ganglia and suppresses cardiac arrhythmia. The purpose of this study was to test the hypothesis that long duration low output ScNS causes cardiac nerve sprouting and increases plasma norepinephrine concentration and the duration of paroxysmal atrial tachycardia (PAT) in ambulatory dogs. We prospectively randomized 22 dogs (11 males and 11 females) into 5 different output groups for 2 months of ScNS: 0 mA (sham) (n = 6), 0.25 mA (n = 4), 1.5 mA (n = 4), 2.5 mA (n = 4), and 3.5 mA (n = 4). As compared with baseline, the changes in the durations of PAT episodes per 48 hours were significantly different among different groups (sham, −5.0 ± 9.5 seconds; 0.25 mA, 95.5 ± 71.0 seconds; 1.5 mA, −99.3 ± 39.6 seconds; 2.5 mA, −155.3 ± 87.8 seconds; and 3.5 mA, −76.3 ± 44.8 seconds; P < .001). The 3.5 mA group had a greater reduction in sinus heart rate than did the sham group (−29.8 ± 15.0 beats/min vs −14.5 ± 3.0 beats/min; P = .038). Immunohistochemical studies showed that the 0.25 mA group had a significantly increased while 2.5 mA and 3.5 mA stimulation had significantly reduced growth-associated protein 43 nerve densities in both atria and ventricles. The plasma norepinephrine concentrations in the 0.25 mA group was 5063.0 ± 4366.0 pg/mL, which was significantly higher than that in the other groups of dogs (739.3 ± 946.3; P = .009). There were no significant differences in the effects of simulation between males and females. In ambulatory dogs, low output ScNS causes cardiac nerve sprouting and increases plasma norepinephrine concentration and the duration of PAT episodes while high output ScNS is antiarrhythmic." @default.
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- W2916017003 date "2019-08-01" @default.
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- W2916017003 title "Antiarrhythmic and proarrhythmic effects of subcutaneous nerve stimulation in ambulatory dogs" @default.
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- W2916017003 doi "https://doi.org/10.1016/j.hrthm.2019.02.027" @default.
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