au·​to·​ma·​tic·​i·​ty ˌȯ-tə-mə-ˈti-sə-tē, -ma- How to pronounce automaticity (audio)
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. Friedman, The New England Journal of Medicine
All adult cardiac myocytes can respond to electrical stimuli and conduct action potentials, but the working cells of the atria and ventricles generally lack automaticityArnold M. Katz, Physiology of the Heart, 5th edition

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Cite this Entry

“Automaticity.” Medical Dictionary, Merriam-Webster, Accessed 23 Apr. 2024.

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