User Manual

16. MAIN FUNCTIONS
Post-shock mode:
After any automatic shock therapy, the post-shock mode makes it possible to apply a pacing
mode other than the standard antibradycardia pacing mode and/or with different pacing
parameters.
SafeR (AAI <> DDD) mode:
Is intended to minimize deleterious ventricular pacing. The defibrillator functions in AAI
mode, and temporarily switches to DDD mode upon the occurrence of AVB III, AVB II, AVB I
and ventricular pause.
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).
16.6. SONR CRT OPTIMIZATION
SonR is a specific sensor, located at the tip of the atrial lead, that picks-up micro-
accelerations of the heart walls to derive information pertaining to cardiac contractility. The
signal picked-up by the SonR sensor can be processed by INTENSIA SonR CRT-D 184 in
order to automatically adjust VV delays and AV delays during rest and exercise for optimal
resynchronization therapy. In addition, the SonR signal is recorded during tachyarrhythmia
episodes to depict acute variations of cardiac contractility. INTENSIA SonR CRT-D 184 can
also transmit real-time SonR signals via telemetry.
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SORIN – INTENSIA SonR CRT-D 184 – U150A