Chapter 5
Programmable Parameters
Evia HF / HF-T Technical Manual
PAGE 58
Intelligent Search
This feature is designed to prevent frequent searches in patients without stable intrinsic ventricular
activity. Each time the search is unsuccessful, the time interval is doubled from the previous interval, up
to 128 minutes. After that, the device will search every 20 hours. The rationale for 20 hours is to allow
the device to perform searches during different times of the day to improve the chances of success.
Search Time Interval Scheme
30 sec. > 1 min. > 2 min. > 4 min. > 8 min. > 16 min. > 32 min. > 64 min. > 128 min. > 20 hr.
Switching Back to DDD(R)
The following criteria will cause the device to switch back to DDD(R):
• No Vs for two seconds
• Two consecutive cycles without a Vs event
• A programmable number of cycles without a Vs out of eight cycles (Default is three out of
eight cycles)
In the presence of a Mode Switch event, the device will switch to the programmed Mode Switch Mode.
Once the Mode Switch event is over, the device will switch back to the DDD(R) mode and then initiate
the Continuity test for the Vp Suppression algorithm.
If a patient has unstable AV conduction, the algorithm may switch to an ADI(R) mode frequently. The
number of times the device can switch to Vp Suppression is limited to 15 attempts per hour. When
the limit is reached, the Vp Suppression feature is suspended until midnight (12:00 AM) and will then
resume the Continuity test starting with the 30 second search interval.
Interaction of Vp Suppression with other Algorithms
The following events will interrupt the Vp Suppression algorithm:
• Wand application
• PMT Detection
• Mode Switch
The algorithm is disabled when the device enters the ERI state.
5.16 Thoracic Impedance
The thoracic impedance is measured between the distal electrode of the RV lead and the pacemaker
housing. 8 measurements per hour are done and these measurements are then averaged. The 24
measurements per day are stored in the device and transmitted via Home Monitoring as a single
averaged data point. 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.
5.17 ProgramConsult
®
ProgramConsult
®
provides clinicians with the option to increase programming efficiency by providing
programming suggestions for frequent pacemaker patient conditions and having the capability to
store individual programming for future usage (can store up to three individual parameter sets for
future programming).
Summary of Contents for Evia HF
Page 1: ...Cardiac Rhythm Management Heart Failure Therapy Evia HF HF T Evia HF HF T Technical Manual...
Page 8: ...Chapter Table of Contents Evia HF HF T Technical Manual PAGE vi...
Page 12: ...Chapter 2 Indications Evia HF HF T Technical Manual PAGE 4...
Page 14: ...Chapter 3 Contraindications Evia HF HF T Technical Manual PAGE 6...
Page 98: ...Chapter 7 Product Storage and Handling Evia HF HF T Technical Manual PAGE 90...
Page 104: ...Chapter 9 Lead Connection Evia HF HF T Technical Manual PAGE 96...
Page 118: ...Chapter 10 Elective Replacement Indication ERI Evia HF HF T Technical Manual PAGE 110...
Page 130: ...Chapter 13 Order Information Evia HF HF T Technical Manual PAGE 122...
Page 132: ...Chapter 14 Order Information Evia HF HF T Technical Manual PAGE 124...
Page 136: ...PAGE 128 Appendix A Evia HF HF T Technical Manual...