User Manual Part 2

4-20
TACHYARRHYTHMIA THERAPY
ANTITACHYCARDIA PACING THERAPIES AND PARAMETERS
0 s 10 s 20 s 30 s 40 s
VF Zone
VT Zone
VT-1 Zone
VT Detection
window satisfied.
Duration starts.
Start episode.
VT Detection met.
Therapy intitiated.
Start ATP Time-out.
AT Time-out expires
in VT zone.
VT-1
Time-out
expires.
VT-1 Detection met.
Initiate shock therapy.
Programmed therapy for lower zones:
VT-1 ATP Time-out = 40 s
VT ATP Time-out = 30 s
ATP is programmed in VT-1 and VT zones.
Redetection and
ATP bursts
ATP Time-out
ATP 1 ATP 1
Burst 1 Burst 5
Redetect
Charging
Rhythm changes to VT-1 zone
Figure 4-20. ATP Time-outs, 3-zone configuration
QUICK CONVERT ATP
QUICK CONVERT ATP provides you with an additional option to treat fast,
monomorphic VT that is detected in t he VF zone.
When QUICK CONVERT ATP is programmed to On, the pulse generator
delivers one burst of ATP for an episode detected in the VF zone in an
attempt to avoid an otherwise scheduled charge and painful shock for a
pace-terminable fast VT.
When delivering QUICK CONVERT ATP therapy, the pulse generator delivers
one burst of ATP for an episode detected in the VF zone. This therapy consists
of 8 pacing pulses at 88% Coupling Interval and 88% BCL. It is delivered only
as the first therapy attempted in an episode and is followed by reconfirmation
(2 out of 3 intervals faster than the lowest rate threshold) prior to the shock
sequence.
In the event that QUICK CONVERT ATP was unsuccessful in converting the
rhythm and shock therapy is required, the feature’s algorithm minimizes the
delay to begin charging. QUICK CONVERT ATP is not applied to any rhythm
above a maximum rate of 250 bpm.
- DRAFT -