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118 Stratos LV/LV-T Technical Manual
R-Wave Trend
This is the sensitivity of the ventricles displayed over time. The
R-wave trend is displayed in the form of a line chart. The R-
wave trend is a rolling, long-term trend with a fixed resolution of
36 hours. Therefore, the 240 time windows with 36 hour
recording periods result in actual recordings of approximately
one year. The R-wave trend can record amplitudes from 0.0 to
20 mV. In the Stratos LV, the specific RV and LV amplitudes are
shown in trends of different colors. The R-wave trend is
available in all modes that sense in the ventricle, except
triggered modes DDI(R)/T, DVT(R), VDT(R) and VVT(R).
2.24 Pacing Statistics
Impedance Trend
The atrial and ventricular impedances are measured in the
Stratos CRT-Ps and both values are displayed in the impedance
trend in the form of a line chart. The impedance trend is a
long-term trend with a fixed resolution of 36 hours per window.
Therefore, the 240 possible windows, each with 36 hour
recording periods, result in an actual recording time of
approximately one year. This recording only occurs in paced
events.
After approximately one year of recording, the impedance trend
begins to roll. The impedance can also be recorded in the left
atrial and left ventricular channel. The values of the impedance
trend lie between 0 to 10k Ω. The atrial and both ventricular
channels are shown as different colored trends.