Objective: To examine the accuracy of Medtronic’s Percept built in device longevity estimate.

Background: In June of 2020 Medtronic received FDA approval for its Percept PC B35200 that was released with a new built in device longevity estimate. Previously we reported findings from 35 device exchanges transitioning from the older Activa PC to the newer Percept PC. Results indicated that Percepts predicted a greater longevity of the current device over the previous actual device life of its Activa predecessor. One of the follow up questions was to determine the accuracy of the Percept estimates, which we pursue here.

Method: We retrospectively examined data from the same 35 device exchanges (09/15/2020-05/18/2022) for accuracy of the Percept estimate across session intervals in which the contact configuration and programmed parameters remained constant. Theoretically, the estimates across such an interval, should be less by the duration of the interval. The individuals were originally implanted bilaterally targeting the subthalamic nucleus for Parkinson’s. Individuals who did not exhibit constant programming intervals were excluded.

Results: A total of 13 individuals were found to have 27 intervals that met the criteria of constancy. A total of 62 interval sessions were examined, averaging 5.17 intervals/individual. The average duration of all 62 intervals was 94.39 days (1.74 sem), while the average duration of the intervals with constant programming was no different at 93.04 days (2.94 sem). Of the constant intervals 18/27 were deemed accurate within 30 days of actual interval (mean: 3.18 days difference; 0.68 sem) with the estimate undershooting the actual difference 13/18 times. Conversely, 9/27 of the constant intervals were inaccurate (mean: 245.17days difference; 227.87 sem; range 61-996 days) with the estimate dramatically overshooting the actual interval in all 9 instances. Of the 13 individuals, 6 exhibited all accurate estimates, while 6 exhibited mixed accuracy, leaving only 1 exhibiting inaccurate estimates. The 9 inaccuracies could not be accounted for by duration of estimate, number of exchanges, bipolar contact configuration, interleaving, fractionation, or duration of interval.

Conclusion: The Medtronic Percept battery longevity estimate was deemed to be accurate in a 2:1 ratio of qualifying intervals. None of the six factors examined was able to explain the 9 inaccurate estimates.

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MDS Abstracts - https://www.mdsabstracts.org/abstract/clinical-accuracy-of-medtronics-percept-built-in-longevity-estimate-algorithm-following-device-exchange/