Korean Circ J.  2015 Mar;45(2):149-157. 10.4070/kcj.2015.45.2.149.

Cervical Vagal Nerve Stimulation Activates the Stellate Ganglion in Ambulatory Dogs

Affiliations
  • 1Krannert Institute of Cardiology and Division of Cardiology, Department of Medicine, Indiana University School of Medicine, Indianapolis, IN, USA. chenpp@iupui.edu
  • 2Department of Neurology, Indiana University School of Medicine, Indianapolis, IN, USA.
  • 3Department of Pathology and Laboratory Medicine, The David Geffen School of Medicine, UCLA, Los Angeles, CA, USA.
  • 4Department of Internal Medicine, Chonbuk National University School of Medicine, Jeonju, Korea.
  • 5Department of Cardiovascular Medicine, Chonnam National University Medical School, Gwangju, Korea.
  • 6Division of Cardiology, College of Medicine, Catholic University of Daegu, Daegu, Korea.

Abstract

BACKGROUND AND OBJECTIVES
Recent studies showed that, in addition to parasympathetic nerves, cervical vagal nerves contained significant sympathetic nerves. We hypothesized that cervical vagal nerve stimulation (VNS) may capture the sympathetic nerves within the vagal nerve and activate the stellate ganglion.
MATERIALS AND METHODS
We recorded left stellate ganglion nerve activity (SGNA), left thoracic vagal nerve activity (VNA), and subcutaneous electrocardiogram in seven dogs during left cervical VNS with 30 seconds on-time and 30 seconds off time. We then compared the SGNA between VNS on and off times.
RESULTS
Cervical VNS at moderate (0.75 mA) output induced large SGNA, elevated heart rate (HR), and reduced HR variability, suggesting sympathetic activation. Further increase of the VNS output to >1.5 mA increased SGNA but did not significantly increase the HR, suggesting simultaneous sympathetic and parasympathetic activation. The differences of integrated SGNA and integrated VNA between VNS on and off times (DeltaSGNA) increased progressively from 5.2 mV-s {95% confidence interval (CI): 1.25-9.06, p=0.018, n=7} at 1.0 mA to 13.7 mV-s (CI: 5.97-21.43, p=0.005, n=7) at 1.5 mA. The difference in HR (DeltaHR, bpm) between on and off times was 5.8 bpm (CI: 0.28-11.29, p=0.042, n=7) at 1.0 mA and 5.3 bpm (CI 1.92 to 12.61, p=0.122, n=7) at 1.5 mA.
CONCLUSION
Intermittent cervical VNS may selectively capture the sympathetic components of the vagal nerve and excite the stellate ganglion at moderate output. Increasing the output may result in simultaneously sympathetic and parasympathetic capture.

Keyword

Autonomic nervous system; Vagus nerve stimulation; Stellate ganglion

MeSH Terms

Animals
Autonomic Nervous System
Dogs*
Electrocardiography
Heart Rate
Stellate Ganglion*
Vagus Nerve Stimulation*
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