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Overactivity or irritability of the vagus nerve, adversely affecting function of the blood vessels, stomach, and muscles.

va′go·ton′ic (-tŏn′ĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Pathology) pathological overactivity of the vagus nerve, affecting various bodily functions controlled by this nerve
[C19: from vag(us) + -tonia, from Latin tonus tension, tone]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌveɪ gəˈtoʊ ni ə)

excessive excitability of the vagus nerve, producing bradycardia, decreased heart output, and faintness.
va`go•ton′ic (-ˈtɒn ɪk) adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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The temporal sequence, while the patient was in the emergency department, of abdominal pain, lightheadedness, a slow pulse, and the arrhythmia shown in the Figure suggest that reflex vagotonia may have played a role in the patient's arrhythmia.
These changes are thought to happen as a result of heterogenity of the myocardial action potential caused by vagotonia (24-27).