Chapter 6 Statistics
Evia HF / HF-T Technical Manual
PAGE 84
6.7.3 Heart Rate Variability
Heart Rate Variability, which is the standard deviation of the 5-minute mean normal to normal interval
over the recorded time is available in the statistics of the Evia HF / HF-T. This is based on the atrial
rate (P-P).
6.7.4 Patient Activity
The patient’s activity is monitored based on the sensor indicated pacing rate in both, rate adaptive and
non-rate adaptive pacing modes. The Evia HF-T stores information about the patient’s activity level
based on the sensor indicated pacing rate on a daily basis. The device stores the time that the patient
is active for each 24-hour period. The time active is dened as the time where the sensor indicated
pacing rate is reached.
The sensor indicated pacing rate is the sensor rate above the sensor’s threshold. The cumulative daily
time when the sensor is active is stored in the device for a period of 240 days. After 240 days, new daily
values replace the oldest daily values.
6.7.5 Thoracic Impedance
The thoracic impedance is measured between the distal pacing lead tip of the RV lead and the
pacemaker housing. 8 measurements are done every hour and these measurements are then
averaged. The 24 measurements per day are then average are stored in the device and transmitted via
Home Monitoring. The Home Monitoring website then displays a trend of the daily average. The same
trend of daily TI averages is displayed on the programmer upon interrogation of the pacemaker. The
TI trend does not replace assessments that are part of standard of care for the clinical practice. The
clinical value of this feature has not been established for the management of patients.
Figure 55: Thoracic Impedance
Key points:
The heart-rate graph reports mean heart rate (indicated by “V” in the key) and resting heart rate
(indicated by “Rest” in the key).
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