End of episodes
End of episode refers to determining if the VA episode has terminated (either spontaneously or after therapy).
Abbott
Return to sinus rhythm intervals are programmable
•Short: 3 intervals
•Normal: 5 intervals
•Long: 7 intervals
Biotronik
When 12/16 intervals (non programmable) are slower than the slowest VT zone
Boston Scientific
Redetection looks for 8/10 fast intervals to occur.
An end of episode duration period is then set in seconds (non programmable)
•Non treated episodes 10 seconds
•ATP only therapy 10 seconds
•Shock therapy 30 seconds
As long as 6/10 intervals remains fast, the arrhythmia is determined as sustained.
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Boston Scientific - Subcutaneous ICD
Once in an episode, the device applies a hysteresis of 40ms under the lowest therapy zone.
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24 intervals need to be below this rate to declare end of episode
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Medtronic
8 consecutive VS intervals
Microport
When at least 75% of the last 8 cycles are slower than the tachycardia zones