Medical Dictionary

automaticity

noun au·to·ma·tic·i·ty \ ˌȯ-tə-mə-ˈti-sə-tē, -ma- \

medical Definition of automaticity

plural automaticities
:the capacity of a cell to generate an action potential spontaneously without an external stimulus
  • Atrial tachycardias due to abnormal automaticity or triggered activity are particularly difficult to abolish with antiarrhythmic drugs.
  • —Leonard I. Ganz and Peter L. FriedmanThe New England Journal of Medicine19 Jan. 1995
  • All adult cardiac myocytes can respond to electrical stimuli and conduct action potentials, but the working cells of the atria and ventricles generally lack automaticity
  • —Arnold M. Katz, Physiology of the Heart, 5th edition2011

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