2.1.1 Effect of CareLink monitor transmissions on projected service life for
CRT-D devices
Service life projections in the above table assume a quarterly schedule of Medtronic
CareLink remote transmissions. Additional CareLink remote transmissions will reduce
device service life. For example, a CRT patient who receives 0% atrial pacing, 100%
biventricular pacing at 70 bpm atrial tracking, 2.5 V amplitude (3.0 V LV amplitude), DDD
mode, with 900 Ω impedance, would expect 6.5 years projected service life. Additional
Medtronic CareLink remote transmissions will reduce service life as follows:
● A single additional transmission will reduce expected device service life by
approximately 1.2 days, or 0.05%.
● Monthly transmissions over the life of the device will reduce expected device service
life by 75 days, or 3%.
● Weekly transmissions over the life of the device will reduce expected device service life
by 308 days, or 13%.
● Daily transmissions over the life of the device will reduce expected device service life
by 1158 days, or 49%.