BIOTRONIK Evia DR, Technical Manual

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Evia Technical Manual 133
11.1 Auto Initialization
Auto Initialization detects when a pacing lead is connected to the
pulse generator at implantation as well as the polarity of the lead
is detected. Upon successful detection, the pulse generator
automatically initiates several key features. Auto Initialization
consists of four phases, which are described below.
1. Lead detection
In order to detect a lead, the Evia pulse generator
continuously delivers sub-threshold paces in both the
ventricular and the atrial channel to measure the lead
impedance. The Evia pulse generator considers a lead
“detected” when the measured impedance is within 100 and
2500 Ohms.
2. Detection and Configuration of the Lead Polarity
The Evia pulse generator switches the lead polarity to
bipolar immediately after a bipolar lead is detected. When
the lead impedance is between 100 and 2500 Ohms, the
lead connected is classified as bipolar and the sense and
pace polarities are set appropriately. The device switches
back to unipolar if the lead impedance falls outside this
range.
3. 10-Minute Confirmation Phase
A 10-minute confirmation phase is initiated after detection of
the lead. The lead impedance measurement is performed
alternating between the atrial and ventricular channel.
Additional impedance measurements at the end of this
phase confirm the lead detection and lead polarity. The
impedance measurements need to fall within the range of
100 to 2500 Ohms.
A lead impedance measurement outside this range restarts
the confirmation process.
Interrogation of the pulse generator during the confirmation
phase results in a message that implant detection is
activated. The confirmation phase is terminated and the
pulse generator features are activated if it is reprogrammed
during this time.