
Lumax Technical Manual 57
2.2.1 Right Ventricular Sensitivity Settings
There are three programmable preset options for setting the
sensitivity of the right ventricular input stage. The sensitivity
selections are designed to adapt the parameters of the input
stage to various signal conditions. The predefined parameter
sets are described in
Table 19
.
Table 19: Sensitivity Settings
Setting
Definition for Use
Standard
This setting is recommended for most
patients, especially for those with
measured R-wave amplitude of
≥
3 mV.
Enhanced
T Wave
Suppression
This setting offers suppression of T-wave
oversensing. This mode should not to be
used on patients with the following
conditions:
•
Sinus rhythms with small signal
amplitudes, R-waves
<
4 mV
•
VF with highly fluctuating signal
amplitudes.
Enhanced
VF Sensitivity
This setting enhances VF detection, in
cases of highly fluctuating signal
amplitudes. It is not to be used for patients
that have sinus rhythms containing large
amplitude T-waves.
Typically, the upper threshold is reset with each sensed R-wave,
but in order to ensure that pacing does not occur during an
episode of VF, the ASC behaves differently with paced events.
Each paced event is followed by a paced refractory period after
which the ventricular threshold is set to the minimum programmed
value.
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