User Manual Part 1

TACHYARRHYTHMIA THERAPY
VENTRICULAR SHOCK THERAPY AND PARAMETERS
4-25
2. If 5 of 10 beats are not detected as slow (or less than 4 consecutive slow
beats after an unsuccessful QUICK CONVERT ATP attempt) and charging
completes, post-charge reconfirmation is performed after charging ends.
After the post- charge refrac tory and the first sensed event, the pulse
generator measures up to 3 intervals following charging and compares
them to the lowest rate threshold.
• If 2 of the 3 intervals following charging are faster than the lowest rate
threshold, the shock will be delivered synchronously with the second
fast event.
• If 2 o f the 3 intervals following charging are slowe r than the lowest
rate threshold, the shock will not be delivered. If no beats are sensed,
pacing will begin at the programmed LRL following the 2-second
no-sense period. If a shock is not delivered, o r if pacing pulses are
delivered, this is also considered a Diverted-Reconfirm.
If a shock is required after redetection, the charge time for the shock may
be short.
The reconfirmation algorithm will not allow two consecutive Diverted-Reconfirm
cycles. If the arrhythmia is detected after a Diverted-Reconfirm, the next shock
in the episode is delivered as if Committed Shock were programmed to O n.
Once a shock has been delivered, the reconfirmation algorithm can be applie d
again (Figure 4-24 on page 4-25).
23 4 56 7 81
23 4 51
231
Intervals are measured and compared to the lowest Rate threshold. If 2 of 3 are slow,
the shock will not be delivered. If 2 of 3 are fast, the shock will be delivered.
Reconfirmation determines arrhythmia
is no longer present. Shock is not
delivered. If no beats are sensed,
pacing will start.
Duration complete.
Start charging.
Refractory
period
Divert
window
Intervals are measured
during charging.
Charging
500 ms
135 ms
Figure 4-24. Committed Shock is programmed to O ff, reconfirmation is On
- DRAFT -