User's Manual

US-ENGLISH – 43
16.4. SENSING
Automatic Refractory Periods: Optimize sensing and make the
implant progamming easier. These periods are composed of a
minimal Refractory Period and a triggerable Refractory Period. The
duration of the refractory periods lengthens automatically as needed.
Protection against noise: Allows the distinction between ventricular
noise and ventricular fibrillation. If the device senses ventricular noise, the
ventricular sensitivity is decreased until noise is no longer detected.
Ventricular pacing can be inhibited to avoid a potential paced T-wave.
Automatic sensitivity control: Optimizes arrhythmia detection and
avoids late detection of T-waves and over-detection of wide QRS
waves. The device automatically adjusts the sensitivities based on
the ventricular sensing amplitude. In case of arrhythmia suspicion or
after a paced event, the programmed ventricular sensitivity will be
applied. The minimum ventricular sensitivity threshold is 0.4 mV
(minimum programmable value).
16.5. FOLLOW-UP FUNCTIONS
Storage of memory data: AIDA+ (Automatic Interpretation for
Diagnosis Assistance) software provides access up to 6 months of
patient follow-up with day by day data collection, or up to 24 hours
with hourly data collection. Episodes of ventricular tachyarrhythmia
are recorded with the programmable EGM channels: either by
selecting up to two traces, or by selecting "V-Double" which enables
a one-channel recording that is twice as long.
Alerts / Warnings: The device routinely performs security self-
checks and technical measurements to ensure system integrity.
When system integrity is found to be at risk outside a follow-up, alerts
are stored in the device memory. When system integrity is found to
be at risk during a follow-up, the information is managed as a
warning (pop-up message) to notify immediately the user.