User's Manual

63
Antitachycardia Functions
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Antitachycardia Functions
Overview of antitachycardia functions:
• Upper tracking rate
• Tachycardia mode
• Tachycardia response
- mode conversion and
- mode switching
• PMT management
• Preventive overdrive pacing
• VES Lock-in Protection
Upper Tracking Rate
In atrial-controlled dual-chamber modes, the upper tracking rate, along
with the atrial refractory period, determines the maximum P-wave-
triggered ventricular rate.
In all the triggered modes, the upper tracking rate limits the pacing
rate triggered by sense events.
Caution! The upper tracking rate must be selected so that it
can be tolerated by the patient for an extended
period of time. The upper tracking rate determines
the minimum interval between a sense or pace
event and the subsequent atrial or ventricular pace
event. A decrease of the pacing interval to that of
the interval corresponding to the upper rate may
be initiated - also at rest - for example, by
detection of atrial extrasystoles, muscle potentials,
or other interferences. Therefore, programming a
low upper tracking rate may be indicated for
patients with increased vulnerability.