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Stratos LV/LV-T Technical Manual 145
9. Elective Replacement
Indication (ERI)
Service times for the Stratos CRT-Ps vary based on several
factors, including battery properties, storage time, lead system
impedance, programmed parameters, amount of pacing and
sensing required, and circuit operating characteristics. Service
time is the time from beginning of service (BOS) to the end of
service (EOS). To assist the physician in determining the
optimum time for pulse generator replacement, an elective
replacement indicator is provided that is activated when the
battery cell capacity drops to a predetermined level. The
following table defines the different service cycles (at standard
settings, 37°C, and with a lead impedance of 500 ohms). The
beginning of the replacement cycle is displayed on the
programmer after pulse generator interrogation and appears on
the printout.
Table 29: Service Cycle Definitions
Abbreviation Service
Cycle
Definition
BOS Beginning of
Service
Normal service cycle;
battery in good condition
ERI Elective
Replacement
Indication
Identifies the time of
elective replacement
indication. The rate
occurring at ERI depends
upon the programmed
mode and magnet
application.
EOS End of
Service
Identifies the end of the
elective replacement
indication period.
The Stratos CRT-Ps indicate the need for replacement by a
defined decrease in the programmed pacing rate without a
magnet applied. The rate change is dependent on the
programmed pacing mode.