parasystole
noun
para·sys·to·le
-ˈsis-tə-(ˌ)lē 
: an irregularity in cardiac rhythm caused by an ectopic pacemaker in addition to the normal one
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“Parasystole.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/parasystole. Accessed 25 Dec. 2024.
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