User's Manual

US-ENGLISH – 49
Anti-PMT protection: Is intended to protect the patient from
Pacemaker-Mediated Tachycardia (PMT) without reducing atrial
sensing capability of the device.
16.5. 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.
Committed period: In DDI or DDD modes, the committed period is a
non-programmable 95 ms ventricular relative refractory period that
starts with atrial pacing. If a ventricular event is sensed during the
committed period, but outside the blanking period, the ventricle is
paced at the end of the committed period. The committed period
prevents inappropriate ventricular inhibition if crosstalk occurs.
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).