Medtronic PROTECTA XT DR D314DRG, Clinician Manual

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Figure 199. Example of an aborted cardioversion therapy
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1 2
200 ms
Normal events
Confirmation interval
ECG
Marker Channel
1 The device has detected VT. It charges its capacitors for cardioversion and confirms that the
tachyarrhythmia is still present.
2 The VT spontaneously terminates, and normal sinus rhythm resumes.
3 The charging period ends, and synchronization starts. At this point, the device stops the
confirmation process.
4 The cardioversion therapy aborts when a “normal event” occurs during synchronization.
9.3.2.5 Bradycardia pacing during and after a cardioversion therapy
On the first ventricular event after charging, the device changes the pacing mode to VVI
until the charge is delivered or aborted. The pacing interval remains unchanged during this
time.
After the cardioversion therapy is delivered, the device monitors for the end of the episode
or redetection. Immediately after delivering the shock, the device starts a post-shock
blanking period of 520 ms and resumes bradycardia pacing If the programmed pacing mode
is an MVP mode (AAIR<=>DDDR or AAI<=>DDD), the device operates in DDDR or DDD
mode for 1 min after a cardioversion therapy. In other cases, the device operates in the
programmed pacing mode.
The Post Shock Pacing parameters are applied. For more information, refer to Section 7.16,
“Increasing the pacing output after a high-voltage therapy”, page 276. If Post VT/VF Shock
Pacing is programmed to On, the device paces at the programmed Overdrive Rate. For
more information, refer to Section 7.19, “Providing overdrive pacing after a VT/VF
high-voltage therapy”, page 289.
Medtronic PROTECTA™ XT DR D314DRG
Clinician Manual 385