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Lumax Technical Manual 83
Furthermore, the ICD/CRT-D prevents therapies of different
arrhythmia classes from permanently retarding or accelerating a
VT in such a way that the cardiac rhythm fluctuates between the
different arrhythmia classes without achieving termination of the
arrhythmia regardless of the Progressive Course of Therapy
setting.
For example, a 10-joule defibrillation shock is delivered for an
arrhythmia detected in the VT-2 zone and results in a deceleration
of the VT so that it is subsequently redetected in the VT-1 zone.
At that point, the Lumax ICDs/CRT-Ds would continue with shock
therapy, but all shocks programmed at less than 10 joules would
be delivered at 10 joules.
If a defibrillation shock is delivered but does not terminate the
arrhythmia, the next shock will always have the same or higher
energy than the last delivered shock. Beginning with the third
shock, all shocks are delivered at maximum energy.
2.9 Bradycardia Therapy
The Lumax ICDs/CRT-Ds have independently programmable
single, dual and triple chamber and post-shock pacing functions.
The post-shock bradycardia parameters may be programmed to
higher rates or output values for the period following a delivered
shock, without significantly compromising the longevity of the
ICD/CRT-D for patients who require chronic bradycardia pacing.
The post-shock programmable values are presented in a
separate subsection from the normal bradycardia pacing support
values.
2.9.1 Bradycardia Pacing Modes
The available bradycardia pacing modes for each member of the
Lumax ICD/CRT-D family are listed in Table 25.