Filter
Top Products
Stratos LV/LV-T Technical Manual 89
Reversion back to the programmed pacing mode occurs in a
similarly programmable manner. If a programmable number of
atrial intervals (Z) out of 8 consecutive atrial intervals (p-p) are
slower than the programmed mode switch intervention rate
(Z out of 8), the device will revert back to the permanently
programmed parameters. Z is programmable from 3 to 8. The
device will also revert back to the permanent program if 2
atrial-paced events occur or if no atrial paced or sensed events
have occurred for at least 2 seconds. Each occurrence of mode
switching resets the corresponding counter (X or Z) to a value of
zero.
Mode Switch Events are recorded in memory and are
available to the user through the following diagnostics:
• IEGM Recordings
• Tachy Episode Trends
• Mode Switch Trends
• Mode Switch Histogram
• Mode Switch Counter
Mode Switching is temporarily suspended during magnet
application and are inactive during ERI.
2.9 PMT Management
A PMT is defined as a tachycardia caused by inadvertently
tracking the retrograde P-waves. The PMT management feature
includes PMT Protection/Termination and a programmable PMT
detection and termination algorithm.
2.9.1 Protection
Pacemaker-mediated tachycardia (PMT) is normally triggered by
ventricular depolarizations that are not synchronized with atrial
depolarizations (e.g., VES). The tachycardia is maintained in a
retrograde direction by intrinsic VA conduction of the stimulated
ventricular depolarization and in an antegrade direction by
ventricular pacing of the pacemaker that is triggered by P-waves.
It is the objective of the atrial PMT protection interval to not use
retrogradely conducted atrial sensed events for pacemaker
timing, but only to statistically evaluate them for detection of
atrial tachycardia incidents.