User Manual

96 Lumax Technical Manual
2.8.3.2 Number of Shocks
The number of shocks defines the total number of shock attempts
per therapy zone (VT-1, VT-2 or VF). Up to 8 shocks are
available in each therapy zone. The first and second shock
energies are independently programmable, while the remaining
shocks are fixed at maximum energy (30 joules for
300/500/600/700 series devices and 40 joules for
340/540/640/740 series devices).
2.8.3.3 Shock Waveform
Two waveforms of shock therapy are available with the
Lumax
ICDs/CRT-Ds, Biphasic and Biphasic 2 (ms). The following
diagram describes each of the shock waveforms.
Figure 9. Biphasic Waveforms
Both waveforms start at the calculated voltage, based on the
programmed energy level. After an exponential discharge through
the lead system to 40% of the initial charge voltage, both shock
waveforms switch polarity. At the second phase the:
 Biphasic waveform discharges to 20% of the initial charge
voltage before the waveform is truncated
 Biphasic 2ms waveform discharges the remaining energy
for two milliseconds before the waveform is truncated
Figure 9 provides a pictorial representation of both biphasic
waveforms.
BIOTRONIK recommends use of the standard Biphasic shock
waveform for initial defibrillation threshold testing. If testing
demonstrates high defibrillation thresholds, testing with the
Biphasic 2ms waveform is offered as a therapeutic alternative to
the standard Biphasic shock.