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Stratos LV/LV-T Technical Manual 131
6.4 Magnet Effect
Automatic Magnet Effect:
After magnet application the pulse generator paces at 90 ppm
for 10 cycles asynchronously. Thereafter, the pulse generator
paces synchronously at the programmed basic rate. During
asynchronous pacing, the AV interval is reduced to 100 ms.
Asynchronous Magnet Effect:
When programmed to asynchronous operation, magnet
application results in asynchronous pacing. Stratos CRT-Ps
pace asynchronously at 90 ppm as long as the magnet is over
the CRT-P. Upon magnet removal, the current basic interval is
completed before the CRT-P reverts to its original operating
mode.
If the magnet effect is set to asynchronous, the AV delay is
reduced to 100 ms (or the programmed AV delay, whichever is
shorter). Shortening of the AV delay to 100 ms during
asynchronous AV sequential stimulation is provided to avoid
ventricular fusion beats in the presence of intact AV conduction.
This allows efficient diagnosis of ventricular capture or failure to
capture.
Synchronous Magnet Effect:
If the magnet effect is programmed to synchronous operation,
magnet application does not affect timing and sensing behavior
of the CRT-P. Synchronous operation is of particular importance
during follow-up, if sensing and inhibition functions are desired
during magnet application.
Trend monitor and event counter operation is interrupted during
magnet application with either ‘Asynchronous’ or ‘Synchronous’
magnet effect.
6.5 Position Indicator
The position indicator facilitates positioning of the programmer
head. The programmer optically and acoustically indicates
whether the programmer head is in communication with the
CRT-P.