BIOTRONIK Lumax DR ICD Series, Technical Manual, Page: 89 / 176

Lumax Technical Manual 81
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AUTION
Shock Impedance - If the shock impedance is less than
twenty-five ohms, reposition the lead system to allow a
greater distance between the electrodes. Never implant the
device with a lead system that has measured shock
impedance as less than twenty-five ohms. Damage to the
device may result.
Defibrillation Threshold - Be aware that changes in the
patient’s condition, drug regimen, and other factors may
change the defibrillation threshold (DFT), which may result in
non-conversion of the arrhythmia post-operatively.
Successful conversion of ventricular fibrillation or ventricular
tachycardia during arrhythmia conversion testing is no
assurance that conversion will occur post-operatively.
Shock Therapy Confirmation – Programming
CONFIRMATION to OFF may increase the incidence of the
ICD/CRT-D delivering inappropriate shocks.
2.8.3.5 Shock Polarity
The polarity of the shock therapy may be programmed and
changed non-invasively. The
Normal polarity configures the
HV 1 connector port as the negative electrode and the HV 2
connector port and the outer housing of the ICD/CRT-D as the
positive electrode for the first phase of the shock.
Reversed
polarity will switch the electrical polarity of the connector ports
and housing. The shock polarity is separately programmable for
each arrhythmia zone.
Alternating polarity is automatically employed when a maximum
energy shock with normal polarity fails to cardovert. The next
shock will have reversed polarity and alternates the polarity for all
subsequent shocks.