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84 Stratos LV/LV-T Technical Manual
The Stratos CRT-Ps have a specially designed header that
allows the CRT-Ps to simultaneously sense and pace in both the
right and left ventricles. Biventricular pacing therapy requires
programming of a bipolar pacing configuration in the ventricle.
Refer to Section 8.1 for a summary of the sensing and pacing
configurations in the ventricle.
If a bipolar lead is connected to the CRT-P, unipolar or bipolar
configuration can be programmed for pacing and sensing. As
compared to bipolar pacing, the unipolar pacing pulse has the
advantage of being clearly identifiable on the ECG. Unipolar
pacing occasionally results in muscle stimulation in the device
pocket or diaphragm.
2.5 Automatic Lead Check
When Lead Check is activated, the lead impedance is
automatically measured with every pace. If the impedance
values are consecutively greater or less than the limits (<200 Ω
and >3000 Ω) for repeated measurements, the system
automatically switches from bipolar to a unipolar lead
configuration. A bipolar lead failure is verified if the lead
impedance measurement falls outside of the acceptable range
for three consecutive readings. When a lead failure has been
detected, a message is displayed on the programmer screen at
the next follow-up visit in order to notify the physician of the
change.
Lead Check also may be activated with unipolar leads. The
pass-fail criterion remains the same as with bipolar leads. In the
event that a lead failure occurs, the Lead Check feature is
disabled and a message is displayed on the programmer screen
at the next follow-up visit to notify the physician of the lead
status.