BIOTRONIK Evia HF, Technical Manual, Page: 103 / 138

Chapter 9 Lead Connection
Evia HF / HF-T Technical Manual
PAGE 95
2. Detection and Configuration of the Lead Polarity
The Evia CRT-P 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.
4. Activation of Pulse Generator Features
The following pulse generator features are activated after the confirmation phase has been
successfully completed:
• Auto Lead Check
• Capture Control
• Statistics
• Rate response
• Collection of patient-specific impedance waveform characteristics for adapting the CLS
algorithm to the patient (data does not control the pacing rate until CLS is programmed on)
• PMT Management
• Auto PVARP
• 2:1 Lock-In protection