extrastimulus

extrastimulus

/ex·tra·stim·u·lus/ (-stim´u-lus) a premature stimulus delivered, singly or in a group of several stimuli, at precise intervals during an extrasystole in order to terminate it.
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The programmed atrial stimulation was performed with a decrement of the coupling interval of atrial extrastimulus of 10 ms with sensed cycle or with stimulated cycles, the length of which were 600, 500, and 430 ms, until the achievement of the atrial refractoriness.