BIOTRONIK Evia DR, Technical Manual

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90 Evia Technical Manual
The feature includes three primary components: Signal Analysis,
Capture Threshold Search, and Capture Verification. The
following paragraphs describe the operation of these three
components (SA, ATM, and CV) of VCC while active in DDD(R)
pacing mode. In the other modes (VDD(R) and VVI(R)), there
are slight variations in the operation of VCC.
Figure 17
provides
a flow chart of the VCC operation.
Signal Analysis (SA)
A polarization artifact that is too large may disturb the cardiac
signal following the pacing pulse and result in misclassification of
the event. Conversely, the evoked response signal may be too
small or may not meet the capture criteria, which again may lead
to misclassification of the event. Therefore, the SA analyzes the
evoked response and the amplitude of the polarization artifact.
A successful SA must always be completed before the Capture
Threshold Search or the activation of Capture Verification.