BIOTRONIK Evity 6 Manuel Technique page 7

• Timing: Pacing in the atrium is checked particularly carefully in dual and triple-
chamber devices by an automatic adaptation of the atrial refractory period in order
to avoid pacemaker-mediated tachycardia (Auto PVARP function: The postventric-
ular atrial refractory period is adapted automatically).
• Additional, special form of rate adaptation with devices from the 8 series: An
increased cardiac output requirement is detected using physiological impedance
measurement. The measuring principle is based on contractile changes (inotropy)
of the myocardium (CLS function: Closed Loop Stimulation). Rate adaptation is
automatically initialized and optimized in CLS mode.
• Ventricular pacing suppression: Unnecessary ventricular pacing is avoided by
promoting intrinsic conduction (Vp suppression function). The device can adapt
itself to conduction changes. In the case of intrinsic conduction, the device switches
from a DDD(R) to an ADI(R) mode.
• 8 series: In the course of the follow-up, an automatic test of the AV delay is
performed to improve the heart performance. AV delays are calculated; the
optimum values can be applied.
Resynchronization therapy
Triple-chamber devices have functions to configure different VV delays in order to
resynchronize the ventricles.
• Capture Control is also available for the left ventricle with automated tracking of
the pacing threshold or automatic threshold monitoring (ATM) for trend analysis.
• To ensure that no additional surgery is necessary in case of a left-sided increase of
pacing threshold or undesired phrenic nerve stimulation, different pacing polarities
can be set for the left ventricular lead with a triple-chamber device. Up to
13 vectors can be used with the HF QP device type.
• 8 series: With the QP device type, the LV vector test provides a fast measurement of
the pacing threshold, the phrenic nerve pacing threshold and the pacing imped-
ance. The relative influence on the service time is also displayed. The measurement
results are evaluated automatically so that the optimal pacing polarity can be set.
The short RV-LV conduction test also supports the selection.
• An additional diagnostic function with biventricular pacing: Variability of the heart
rate, patient activity, and thoracic impedance are monitored on a continual basis.
Programs
There are two types of therapy programs:
• Default parameters are offered for the most common indications (ProgramConsult
function).
• Individual settings can be saved in 3 individual therapy programs.
ProMRI devices recognize magnetic resonance imaging devices
The static magnetic field of magnetic resonance imaging devices is reliably recognized
with the aid of a sensor. This sensor can be activated for a maximum of 14 days using
the MRI AutoDetect function during an interrogation.
If the patient comes near a magnetic resonance imaging device within the time set, the
implanted device recognizes the static magnetic field and automatically activates the
preset MRI program. Reprogramming to the permanent program occurs also auto-
matically after leaving the imaging device.
Home Monitoring functions
The device automatically sends information to the transmitter once a day. In addition to
this, test messages can be initiated using the programmer. Important medical informa-
tion includes, among others, the following:
• Ongoing atrial and ventricular arrhythmia
• Parameters relevant to leads in the atrium and ventricle: Thresholds, sensing
amplitudes, impedances
• Current statistics on bradycardia therapy
• Individually adjustable timing interval for device messages which provide additional
information pertaining to the device messages
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• IEGM online HD with up to 3 high definition channels
• Transmission of these IEGM recordings with device messages
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