Specifications

7 x 9 inches (178 mm x 229 mm)
Medtronic Confidential
Refer to the “Reference man.” category in doc#163256 for Printing
Instructions.
196407001 Rev A
Elective Replacement Indicator (ERI)
Overview
The Elective Replacement Indicator (ERI) is reported upon interrogation
with the programmer when the pacemaker battery is nearly depleted. When
the ERI is set, the pacemaker is automatically reprogrammed to a
distinctive set of parameters. For the Prodigy pacemaker, ERI is permanent
VVI mode at 65 ppm.
Basis for Setting ERI
ERI is set when the battery voltage drops below a certain limit and remains
there. (The ERI criteria for all Prodigy pacemaker models are listed in the
“Elective Replacement Indicator [ERI],” Section C in Part III.) When ERI
is set, diagnostic data collection is suspended, but data previously collected
is retained in the pacemaker’s memory.
WARNING: When ERI is set, Prodigy DR, Prodigy D, and Prodigy VDD
pacemakers should be replaced within 3.0 months, whereas, Prodigy SR
and Prodigy S pacemakers should be replaced within 2.5 months. For
projected time remaining until cessation of pacing, refer to “Longevity
Projections,” Section C in Part III.
ERI Verification
When the programmer detects that ERI is set, it displays a message. Upon
command, the programmer will attempt to reset the ERI. The programmer
first performs a stress test to determine the battery’s condition. If the
battery fails the stress test, the programmer will not reset ERI. Because ERI
is set only after multiple voltage measurements, it is unlikely to be set
prematurely. Therefore, it is anticipated that most attempts to reset it will
fail.
For Further Information
Refer to the section “Displaying a Summary of Pacemaker Status” in
Chapter 4 to interrogate the pacemaker’s battery and ERI status. Refer to
the section “Elective Replacement Indicator (ERI),” Section C in Part III,
for further information on ERI parameter settings for all Prodigy models.
16-8 Understanding Pacemaker Operations
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