User Manual

Lumax Technical Manual 89
The Sustained VT parameter is intended to force tachycardia
therapy in cases where a cardiac rhythm meets the VT rate
criteria but does not satisfy one or more detection enhancement
criterion (Onset, SMART Detection, or Stability) for an extended
duration. This “safety” timer is initiated within one of the VT
zones. If the programmed Sustained VT time period expires
without tachycardia detection, redetection is initiated without
utilizing the detection enhancements.
A simple up/down counter is used to initiate the safety timer. The
counter is incremented by one when an interval falls into a VT
zone and decrements by one when an interval falls into the sinus
zone. When the counter reaches a number equal to the
programmed VT detection counter, the safety timer is started.
The timer runs until the programmed time expires and therapy is
delivered or until the timer is reset. The timer is reset with initial
detection or VT termination.
The safety timer is not used in redetection. If initial detection was
due to the safety timeout and SMART Redetection is
programmed “ON”, then SMART Detection will not be used for
redetection.
2.5.8 VT Monitoring Zone
The VT1 zone can be programmed to monitor for non-sustained
arrhythmias not requiring therapy. The monitoring zone can be
programmed with all the standard detection enhancements
including SMART Detection
TM
to monitor for non-sustained
ventricular tachycardia or atrial tachyarrhythmias. Any
tachyarrhythmia meeting the Monitor Zone criteria will store an
IEGM.
2.5.9 Atrial Monitoring Zone
This feature allows the device to store an IEGM for atrial
tachyarrhythmias such as Atrial Fibrillation or Atrial Flutter. The
zone is programmed by rate with a range of 100 bpm to 250 bpm.
Any atrial tachyarrhythmia meeting the Atrial Arrhythmia Monitor
Zone criteria will store an IEGM.