User's Manual

52
Pacing and Sensing Functions
Amplitude Control (ACC)
Purpose
The amplitude control function (Active Capture Control - ACC) does the
following:
Continuously monitors for effective ventricular pacing
Periodically determines the ventricular pacing threshold
Verifies the stimulus response
The advantage for the patient is that pacing remains effective even
when there are changes in threshold. Because the pacing amplitude is
continuously being adjusted to the threshold, it is possible to optimally
configure the energy reserves of the pacemaker and thus ensure
reliable patient care.
The ACC function works for a ventricular rate of up to 100 bpm.
Note: Leads that generate high polarization artifacts are
not suitable for ACC.
Description
The efficacy of a stimulus is monitored by a beat-to-beat algorithm,
and the pacing energy is continuously adapted in the case of pacing
threshold fluctuations. The ACC function features the following sub-
functions:
Signal analysis
Automatic pacing threshold search
Verification of the stimulus response
Signal Analysis
Purpose
This function analyzes the signal quality of the ventricular evoked
stimulus response (when the stimulus is effective) and the polarization
artifacts (when the stimulus is ineffective). The function ensures that
only “undisturbed” or appropriate signals are evaluated. The signal
analysis function works for ventricular rates of up to 100 bpm.