Impulse Dymanics OPTIMIZER Smart System - Conditions Causing Inhibition in Active OVO-LS-CCM Mode; Local Sensing

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9.6.2 Conditions Causing Inhibition in Active OVO-LS-CCM Mode
The following cardiac activities or events are sensed and detected by the
OPTIMIZER Smart IPG while it is in its Active state. These events are also
entered into the statistical data set, and they pertain to transmitted marker events.
When CCM train delivery is on, such events inhibit CCM signal delivery. An
event that occurs outside the configurable time window(s) could indicate, for
example, suspected cardiac arrhythmia, and, in response to detecting the
suspected arrhythmia, or other abnormal event, the CCM signal would not be
delivered.
• LS Out of Alert: A local sense event detected after the end of the Local
Sense Alert Window triggers an LS Out of Alert condition. The Local
Sense Alert Window is the time interval during which the leading edge of
valid LS events triggers CCM signal delivery. How this is programmed is
detailed in Section 9.8.1.
• Ventricular Tachycardia (VT): Any ventricular rate exceeding a certain
threshold is considered ventricular tachycardia. Using the OMNI Smart
Programmer software, the ventricular tachycardia threshold rate can be set
to one of 19 possible values between 62 bpm and 110 bpm. CCM signal
delivery is always inhibited when ventricular tachycardia is detected.
• Atrial and ventricular noise: Despite various methods for detecting and
filtering noisy signals implemented in the OPTIMIZER Smart IPG, noise
from powerful electromagnetic sources (e.g. from portable telephones,
radio transmitters, etc.) as well as noise from physiological events (e.g.
myopotentials, etc.) can interfere with the detection of cardiac events.
Any time higher rate signals (greater than 11.6 Hz) are detected on the
atrial or ventricular channel, the control logic of the OPTIMIZER Smart
IPG assumes the presence of noise and declares an A/V noise condition.
CCM signal delivery is always inhibited if atrial or ventricular noise is
detected.
9.7 Local Sensing
The local electrical activity of the ventricular myocardium is detected via the Local Sense
(LS) lead. LS channel sensitivity can be set with the OMNI Smart Programmer software
to one of 18 values between 0.1 mV and 10.0 mV.
Note: When the OPTIMIZER Smart IPG is in Active OVO-LS-CCM mode, the
minimum allowable setting for this parameter is 1.0 mV.