
76 Lumax Technical Manual
2.8.2.4 ATP One Shot
ATP One Shot offers the opportunity to treat fast VTs that are
detected in the VF zone with a single ATP sequence delivered
immediately before charging of the high energy capacitors. The
device performs a stability check (same as VT zones, criterion
12% fixed) to determine if the arrhythmia might be a fast VT and if
the rhythm is stable, the programmed ATP sequence is delivered
prior to charging. Charging starts without redetection and the
successful treatment of the arrhythmia will be confirmed prior to
shock delivery during shock charging. If the arrhythmia is
converted by the ATP, the shock is aborted. All ATP therapy
parameters are available for programming ATP One Shot and it
can only be used with shock therapy is programmed ON.
2.8.3 Shock Therapy
Shock Therapy is developed by internal circuitry that stores
energy across high energy capacitors. The voltage level for the
charging cycle is based on the programmed energy level. The
energy is then delivered over the connected ICD lead and through
the ICD/CRT-D housing utilizing a biphasic waveform. The first
and second shock energies in each shock module have
independently programmable Shock Energy.
A synchronization window is started at the end of the charging
period. During this window, the device will attempt to synchronize
the shock therapy to an R-wave. If no R-wave is detected and
Confirmation is programmed to OFF, the shock will be delivered
asynchronously at the end of the synchronization period (DF). If
no R-wave is detected and Confirmation is programmed to ON,
the shock will be aborted at the end of the synchronization period
(DFc = Cardio Version).
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