28 – ENGLISH
Polarity configuration: As soon as the detection of implantation has
been confirmed, the device performs a polarity check by launching
bipolar impedance tests for the atrial and ventricular leads. 1. If the
leads are confirmed to be bipolar, the sensing polarities are
programmed to bipolar, and the pacing polarities are programmed to
unipolar (as shipped values) or bipolar (if the values are re-
programmed to "bipolar" in the box). 2. If the leads are not confirmed
to be bipolar, pacing and sensing are unipolar.
Measurements of lead impedances: Twenty minutes after the
detection of implantation has been confirmed, the device starts
measuring the lead impedances every 6 (six) hours and data is
stored for each chamber.
Automatic launch of parameters: Twenty minutes after the
detection of implantation: 1. The device switches from DDD to SafeR
mode. 2. Memories are initiated. 3. Sensor is programmed to "Learn".
4. Statistics are reset to zero.
Autosensing
The Autosensing function allows automatic adjustment of atrial and
ventricular sensitivities.
Operation: 1. If the atrial (or ventricular) Autosensing function is
programmed to Auto, the atrial (or ventricular) sensitivity is constantly
adjusted to 37.5% of the mean amplitude of the atrial (or ventricular)
signals. 2. When the atrium is paced, and for the duration of an atrial
arrhythmia, the atrial sensitivity tends toward 0.4 mV. 3. When the
ventricle is paced, the ventricular sensitivity tends toward 1.5 mV in
bipolar configuration and toward 2.5 mV in unipolar configuration.
Programming constraints: 1. The atrial Autosensing function (Auto
mode) is available only when the atrial sensing polarity is bipolar.
2. When the Overdrive function is activated, the atrial Autosensing
function is not programmable.
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