User's Manual

16. MAIN FUNCTIONS
Defibrillation threshold (DFT):
Be aware that the changes in the patient’s condition, drug regimen, and other factors may
change the defibrillation threshold (DFT) which may result in non-conversion of the
arrhythmia post-operatively. Successful conversion of ventricular fibrillation or ventricular
tachycardia during arrhythmia conversion testing is no assurance that conversion will occur
post-operatively.
16.4. PACING
BTO (Brady Tachy Overlap):
Corrects chronotropic atrial incompetence by allowing pacing in the slow VT zone, without
affecting arrhythmia detection specificity.
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 effects of 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 programming 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).
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SORIN – PLATINIUM DR – U460A