coun·ter·shock
| \ -ˌshäk
\
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Medical Definition of countershock
: a therapeutic shock of electricity applied to a heart for the purpose of altering a disturbed rhythm (as in chronic atrial fibrillation)
delivering a life-saving countershock within seconds of an arrhythmic episode— John Maurice
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“Countershock.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/countershock. Accessed 22 Jun. 2021.
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