3.2 Battery longevity
During follow-up, 206 (59%) of patients reached ILR EOL (Table 2), with precise longevity determined in 1175 of these cases. Overall, the median battery longevity measured 42 [40-45] months with minimum and maximum battery longevity spanning a range of 24-72 months among patients. Battery longevity according to ILR model and manufacturer is displayed in figure 2.
Of interest, the time to EOL range varied among patients, as displayed in figure 3: from 28 to 61 months for model Reveal 9529, 36 to 51 months for model Reveal Linq II, from 24 to 51 months for model Confirm ILR 2102 and from 24 to 41 months for model Confirm Rx 3500. As such, maximum difference in time to EOL among patients implanted with same ILR models was: 33 months for Reveal 9529, 15 months for Reveal Linq II, 27 months for Confirm ILR 2102 and 17 months for Confirm ILR.
Premature end-of-life, here defined as time to EOL less than the prespecified manufacturers battery longevity, occurred in one patient (0.5%). In this particular patient EOL was reached after 28 months, while a battery longevity of at least 36 months was guaranteed according the manufacturer product performance specifications. No clear explanation was found for this premature end-of-life. In patients exceeding the predefined battery longevity, a median additional battery longevity was seen of 6 [2-9] months for the Reveal 9529, 7 [5-8] months for the Reveal Linq, 19 [16-21] months for the Confirm ILR 2102 and 1 [0-12] month for the Confirm RX DM 3500.