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Stratos LV/LV-T Technical Manual 81
2.3.12 Ventricular Blanking Period
The ventricular blanking time is the period after an atrial pacing
pulse during which ventricular sensing is deactivated. It is
intended to prevent ventricular sensing of the atrial pacing pulse
(“crosstalk”).
The blanking time shall be as short as possible in order to
provide ventricular sensing when a ventricular depolarization
could occur.
Crosstalk may be encountered if a shorter blanking time,
unipolar ventricular sensing, a higher ventricular sensitivity
(lower value) and/or a high atrial pulse amplitude and pulse
width are programmed.
Values between 30 ms and 70ms (30… (10) …70 ms) can be
set for the ventricular blanking period. The value should be set
as low as possible and yet high enough to ensure ventricular
sensing.
However, it must be programmed to ensure atrial pacing is not
sensed in the ventricle.
2.3.13 Safety AV Delay
The safety AV delay (set at 100 ms) applies to all dual chamber
pacing modes
To prevent ventricular pulse inhibition in the presence of
crosstalk, a ventricular pulse will be emitted at the end of the
safety AV delay (Figure 5
). When pacing is AV sequential at the
pre-set safety AV delay, the presence of crosstalk should be
considered and appropriate reprogramming performed (lengthen
the ventricular blanking time, lower ventricular sensitivity, bipolar
configuration, and/or lower atrial pulse energy).