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Stratos LV/LV-T Technical Manual 91
Confirmation
When the suspicion criterion has been met, the Stratos CRT-Ps
slightly modify the AV delay interval (+ or - 50 ms) for one
cardiac cycle. If the Vp-As interval remains stable, a PMT is
confirmed. Otherwise, a PMT is not confirmed and the algorithm
restarts. Once the PMT algorithm has confirmed a PMT, the
cycle is terminated.
The upper interval limit range must be shorter than the limit of
the VA delay (350 ms, for example). The test method is based
on the length of the pacing interval or the AV delay (refer to
Table 22
).
Table 22. PMT Test Method
Interval Length AV Delay Test Method
> UTI (upper
tracking interval)
≤ 200 ms Increasing the AV
delay by 50 ms
> UTI + 50 ms > 200 ms Reducing the AV
delay by 50 ms
≤ UTI ≤ 200 ms Increasing the UTI
by 50 ms
≤ UTI > 200 ms Increasing the UTI
by 50 ms
> UTI and ≤ UTI +
50 ms
> 200 ms Length of UTI = TA
+ 50 ms
Termination
Stratos CRT-Ps extend TARP (Total Atrial Refractory Period) for
one cycle to equal the V-V interval + 50 ms.
2.10 Adjustment of the PMT Protection
Window
The PMT protection window can be automatically adjusted. This
automatic adjustment functions in the following manner: