BIOTRONIK Evia HF - 7 Other Functions;Features; Safe Program Settings; Magnet Effect; Automatic Magnet Effect

Chapter 7 Other Functions/Features
Evia HF / HF-T Technical Manual
PAGE 87
7. Other Functions/Features
Evia HF / HF-T pulse generators offer many additional functions and features to assist the physician in
the care of the pacemaker patient.
7.1 Safe Program Settings
Activating the preset values for the Safe Program is a quick and convenient way to provide VVI
pacing at a high output setting in urgent situations. Table 19 shows the Safe Program settings for
Evia CRT-P devices.
Parameter Setting
Mode VVI
Pacing Rate 70 ppm
Amplitude 4.8 V (Right/Left ventricle)
Pulse Width 1.0 ms (Right/Left ventricle
Sensitivity 2.5 mV
Ventricular Refractory
Period
300 ms (RV)
200 ms LV
Pacing Polarity Unipolar
Single Chamber Hysteresis OFF
Table 19: Safe Program Settings
7.2 Magnet Effect
7.2.1 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.
7.2.2 Asynchronous Magnet Effect
When programmed to asynchronous operation, magnet application results in asynchronous pacing.
The pulse generator paces asynchronously at 90 ppm as long as the magnet is over the pulse
generator. Upon magnet removal, the current basic interval is completed before the pulse generator
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 efcient diagnosis of ventricular capture or failure to capture.
7.2.3 Synchronous Magnet Effect
If the magnet effect is programmed to synchronous operation, magnet application does not affect timing
and sensing behavior of the pulse generator. 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 any magnet application.