BIOTRONIK Lumax DR ICD Series, Technical Manual, Page: 76 / 176

68 Lumax Technical Manual
The ICDs/CRT-Ds may be programmed to use ventricular-only
information, or both atrial and ventricular information for the
discrimination of ventricular tachycardias. With SMART
Detection™ turned ON, the Lumax ICDs/CRT-Ds use atrial and
ventricular signals for discrimination of fast heart rhythms. With
SMART Detection™ turned OFF, only the ventricular rate is used
to discriminate between ventricular rhythm classes. If SMART
Detection

is enabled, this algorithm evaluates all cardiac signals
within the VT range and increments the VT Sample Count for all
intervals that are deemed VT. A full description of SMART
Detection™ is provided in the following text.
In addition, when the Lumax senses the programmed number of
consecutive intervals (termination count) within the sinus rate
zone, all tachyarrhythmia detection criteria, including the VT
sample counters are reset.
2.5.4 SMART Detection™
DR and HF versions only
This discrimination algorithm enhances VT-1 and VT-2 detection
by applying a series of tests to the sensed cardiac signal.
SMART Detection™ is intended to discriminate VT from a variety
of supraventricular arrhythmias that are conducted to the ventricle
and that would otherwise satisfy VT-1 or VT-2 rate detection
criteria.
First, the average ventricular rate is compared to the average
atrial rate. In the event that the measured ventricular rate is
faster than the atrial rate, the device immediately declares the
rhythm a VT and delivers programmed ventricular therapy for the
detected VT zone.
In the event that an atrial rate is faster compared to the ventricular
rate one of three tests are performed:
Ventricular rhythm stability, (see Stability on page 69 ) if the
ventricular signal is unstable, then the rhythm is declared a
supraventricular tachyarrhythmia, (SVT) and ventricular therapy is
typically withheld.