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Product Description
Diagnostic and Therapy Functions
General overview
All the systems have extensive features that allow quick diagnosis and delivery of
safe therapy for bradycardia conditions.
• Automatic functions make it easy and fast to implant, configure, and check the
pacemaker.
• Auto-initialization after implantation : the implant automatically detects the
implanted leads, sets the polarity and activates the automatic functions after
10 min.
Diagnostic functions • Data from the last 10 interrogations and follow-ups are recorded as well as
arrhythmia episodes; they are stored together with other data to assess
patients and the state of the implant at any time.
• Automatic below-threshold impedance measurement is performed in the
implant independent of the pacing pulse in order to check the lead for proper
functioning.
• When performing follow-ups using the programmer, the IEGM is indicated with
markers after applying the programming head during the test procedure.
Antibradycardia pacing • Sensing: the amplitudes of the P and R waves are measured in the implant fully
automatically to record varying amplitudes. The sensitivity for the atrium and
ventricle is adapted automatically on an ongoing basis. The measurement data
are averaged and the trend can be displayed.
• Thresholds: atrial as well as ventricu lar pacing thresholds are automatically
determined in the implant. Active capture control is used to set the pacing
amplitudes so that pacing is performed with the optimum atrial and ventricular
amplitude for the patients with each change of the pacing threshold.
• Timing: pacing is particularly checked in the atrium by automatic adaptation
of the atrial refractory period to avoid pacemaker-induced tachycardia.
(Auto PVARP function: automatic postal-atrial refractory period)
• Additional, special form of rate adaptation: an increased cardiac output require-
ment is detected using physiological impedance measurement. The measuring
principle is based on contractile ch
anges (ionotropy) of the myocardium
(CLS function: Closed Loop Stimulation). The suitable rate adaptation is auto-
matically initialized and optimized in CLS mode.
• Ventricular pacing suppression: unnecessary ventricular pacing is avoided by
promoting intrinsic conduction (V
p
suppression function). The implant can
adapt itself to conduction changes. In the case of intrinsic conduction, the
implant switches to a mode similar to AAI.