extrasystole
noun
ex·tra·sys·to·le
ˌek-strə-ˈsi-stə-(ˌ)lē 
: a premature beat of one of the chambers of the heart that leads to momentary arrhythmia
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“Extrasystole.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/extrasystole. Accessed 22 Nov. 2024.
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extrasystole
noun
ex·tra·sys·to·le
-ˈsis-tə-(ˌ)lē
: a prematurely occurring beat of one of the chambers of the heart that leads to momentary arrhythmia but leaves the fundamental rhythm unchanged
called also premature beat
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