User's Manual

15. SPECIAL MODES
SAFETY MODE (NOMINAL VALUES)
Nominal values may be rapidly restored by pressing the following button on the programming
head or programmer keyboard:
or via the Emergency button on the SMARTVIEW screen.
In safety mode, the defibrillator operates with the nominal parameters values in the table of
programmable parameters.
MAGNET MODE
When the magnet is applied:
― antiarrhythmia functions are inhibited (detection of rhythm disturbances, charging, and
therapy),
― hysteresis, VV delay and AVD paced/sensed offset are set to 0,
― pacing amplitude is set to 6 V,
― pulse width is set to maximum,
― the following functions are disabled: ventricular arrhythmia prevention, Mode Switch,
Anti-PMT, Smoothing, Rate Response.
When the magnet is removed:
― arrhythmia detection algorithms and sequential therapies are reinitialized,
― therapies start with the least aggressive program for each area.
The antiarrhythmia functions inhibition is extended after magnet removal if a charge occurred
just before the application of the magnet in order to ease the communication between the
device and the programmer.
The other parameters remain at their programmed value, including the ventricular paced
chamber parameter.
RESPONSE IN THE PRESENCE OF DISTURBANCE
If the defibrillator senses electrical noise at a frequency above 16 Hz, it switches to an
asynchronous mode at the basic rate. The programmed mode is restored as soon as the
noise is no longer detected.
Ventricular pacing may also be inhibited by ventricular noise. It can be restored by setting the
parameter “V pacing on noise” to “On”.
DETECTION CHARACTERISTICS IN THE PRESENCE OF
ELECTROMAGNETIC FIELDS
Per Clause 27.4 of Standard EN 45502-2-2, detection in the presence of electromagnetic
fields is characterized as follows:
― Differential mode:
15.1.
15.2.
15.3.
15.4.
15. SPECIAL MODES
SORIN – PLATINIUM 4LV SonR CRT-D 1844 – U906A 39