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86 Stratos LV/LV-T Technical Manual
2.6 Antitachycardia Functions:
The antitachycardia functions include:
• Upper basic rate
• Tachycardia mode
• Tachycardia behavior
• Mode Switching
• PMT Management
• Preventive Overdrive Pacing
• Post-AES Pacing
2.6.1 Upper Rate and UTR Response
In atrial-controlled dual chamber modes, the upper tracking
interval (UTI), along with the atrial refractory period or PMT
protection window limits the ventricular pacing rate such that it
will never exceed the programmed upper rate regardless of the
patient's atrial rate.
In all triggered modes, the upper tracking interval limits the
pacing rate that is triggered by sensing.
NOTE:
Select the upper rate based upon the patient’s tolerance for
the rate. The upper rate limit determines the minimal interval
between a sense or pace event and the subsequent atrial or
ventricular pacing event. A shortening of the pacing interval
to the upper rate interval may also be initiated at rest (e.g.,
by detection of muscle potentials). Therefore, for patients
with increased vulnerability a lower programmed upper rate
is recommended.
2.7 Wenckebach 2:1
Wenckebach behavior or 2:1 behavior is available depending on
the programming of the atrial refractory period, the PMT
protection window and the upper tracking interval in the modes
DDD, DDT/A, VDD, DDT and VDT.