User Manual

90 Lumax Technical Manual
2.6 Tachyarrhythmia Redetection
The Lumax ICDs/CRT-Ds offer independently programmable
settings for determining if tachyarrhythmias remain after therapy
has been delivered. The redetection routine allows the
ICDs/CRT-Ds to determine whether further therapy is required
when the initial therapy was unsuccessful in terminating the
arrhythmia.
Tachyarrhythmia redetection criteria are based on cardiac cycle
length and number of intervals. The number of intervals is distinct
and independent of the initial detection criteria.
2.6.1 VT Redetection
The Counter: Redetection parameter may be programmed
separately for each arrhythmia class, independent of the initial
detection parameters:
Redetection of an ongoing tachyarrhythmia is declared when the
Counter: Redetection is satisfied (based on individual cycles). If a
sensed cardiac signal meets any VT rate criteria, following
therapy, that signal is counted and compared to the programmed
Counter: Redetection setting.
Redetection functions are based exclusively on the VT criterion.
2.6.2 SMART Redetection
DR and HF versions only
With SMART Redetection programmed ON, both atrial and
ventricular signals are used for redetection after initial detection
and therapy for a VT. SMART Detection™ will function identically
as in initial VT detection. SMART Redetection is autotmatically
programmed ON in the Lumax 600/640 and 700/740 models.
2.6.3 Forced Termination
DR and HF versions only
With SMART Redetection programmed ON, this programmed
parameter sets a time after which the SMART Redetection will be
terminated even if the SVT is still ongoing. This forces the device
to terminate the episode and allow detection of a new VT or VF
episode.