1- What diagnosis is suggested by the interval plot?
Probable episode of monomorphic VT detected in the VF zone and treated by a first burst which appeared ineffective and then by a second burst which appeared effective.
2- What is the first therapy delivered by the device?
The episode is detected in the VF zone; when the initial VF counter is full, a burst before charging is delivered.
3-Has the device charged its capacitors?
No, this is a burst before charging; when the burst is effective, the device does not charge its capacitors.
4- What is the second therapy delivered by the device?
The first burst was ineffective; the redetection criterion is verified (12 / 16 cycles classified as VF); the second therapy is a burst during charging (ATP + start of capacitor charging).
5- What does ‘abandon’ mean?
The burst was effective in terminating the arrhythmia; after 4 consecutive ventricular paced cycles, the criterion for confirming the persistence of the arrhythmia is not met (criterion of 2/5 rapid cycles) and the charge is interrupted (therapy discontinued).
