Battery lifetime in pallidal deep brain stimulation for dystonia
Article first published online: 15 DEC 2010
© 2010 The Author(s). European Journal of Neurology © 2010 EFNS
European Journal of Neurology
Volume 18, Issue 6, pages 872–875, June 2011
How to Cite
Blahak, C., Capelle, H.-H., Baezner, H., Kinfe, T. M., Hennerici, M. G. and Krauss, J. K. (2011), Battery lifetime in pallidal deep brain stimulation for dystonia. European Journal of Neurology, 18: 872–875. doi: 10.1111/j.1468-1331.2010.03290.x
- Issue published online: 9 MAY 2011
- Article first published online: 15 DEC 2010
- Received 29 July 2010 Accepted 3 November 2010
- battery longevity;
- deep brain stimulation;
- globus pallidus internus
Background and Purpose: The aim of the study was to analyse the lifetime of Soletra implantable pulse generators (IPG) in deep brain stimulation (DBS) of the globus pallidus internus (GPi) for dystonia, depending on stimulation parameters and the total electrical energy delivered (TEED) by the IPG.
Methods: In a prospective series of 20 patients with GPi DBS for dystonia, we recorded IPG longevity and stimulation parameters over time. An evaluation of the TEED was performed using the previously suggested equation [(voltage2 × pulse width × frequency)/impedance] × 1 s.
Results: During median follow-up of 57 months (range 23–79 months), 64 IPGs were replaced because of battery depletion or end of life signal. We found a mean IPG longevity of 25.1 ± 10.1 (range 16–60) months, which was inversely correlated with the TEED (r = −0.72; P < 0.001). IPG longevity was not different between bipolar and monopolar stimulation (24.9 ± 10.8 vs. 25.4 ± 9.0 months, P = 0.76). Incongruously, the mean TEED applied throughout the lifetime cycle was significantly higher in patients with bipolar compared with monopolar stimulation (584 ± 213 vs. 387 ± 121 Joule; P < 0.01).
Conclusions: Battery lifetime in GPi DBS for dystonia is substantially shorter compared with that reported in DBS for Parkinson’s disease, caused by a considerably higher voltage and greater pulse width and therefore a higher TEED applied during the battery lifetime cycle. The commonly used equation to calculate TEED, however, seems to be correct only for monopolar, but not bipolar stimulation.