OBJECTIVE: High frequency oscillations (HFOs) have been implicated in ictogenesis and epileptogenesis. The effect of contact size (in the clinical range: 1-10mm(2)) on HFO detection has not been determined. This study assesses the feasibility of HFO detection in a rat epilepsy model using macrocontacts and clinical amplifiers, and the effect of contact size on HFO detection within the macrocontact range. METHODS: Eight epileptic rats were implanted with intracerebral electrodes containing three adjacent contacts of different sizes (0.02, 0.05 and 0.09 mm(2)). HFOs were manually marked on 5 min interictal EEG segments. HFO rates and durations were compared between the different contacts. RESULTS: 10,966 ripples and 1475 fast ripples were identified in the recordings from 30 contacts. There were no significant differences in spike or HFO rates between the different contact sizes, nor was there a significant difference in HFO duration. CONCLUSIONS: HFOs can be detected in a rat epilepsy model using macrocontacts. Within the studied range, size did not significantly influence HFO detection. SIGNIFICANCE: Using comparative anatomy of rat and human limbic structures, these findings suggest that reducing the size of macrocontacts (compared to those commercially available) would not improve HFO detection rates.
OBJECTIVE: High frequency oscillations (HFOs) have been implicated in ictogenesis and epileptogenesis. The effect of contact size (in the clinical range: 1-10mm(2)) on HFO detection has not been determined. This study assesses the feasibility of HFO detection in a ratepilepsy model using macrocontacts and clinical amplifiers, and the effect of contact size on HFO detection within the macrocontact range. METHODS: Eight epilepticrats were implanted with intracerebral electrodes containing three adjacent contacts of different sizes (0.02, 0.05 and 0.09 mm(2)). HFOs were manually marked on 5 min interictal EEG segments. HFO rates and durations were compared between the different contacts. RESULTS: 10,966 ripples and 1475 fast ripples were identified in the recordings from 30 contacts. There were no significant differences in spike or HFO rates between the different contact sizes, nor was there a significant difference in HFO duration. CONCLUSIONS: HFOs can be detected in a ratepilepsy model using macrocontacts. Within the studied range, size did not significantly influence HFO detection. SIGNIFICANCE: Using comparative anatomy of rat and human limbic structures, these findings suggest that reducing the size of macrocontacts (compared to those commercially available) would not improve HFO detection rates.
Authors: Michel Le Van Quyen; Anatol Bragin; Richard Staba; Benoit Crépon; Charles L Wilson; Jerome Engel Journal: J Neurosci Date: 2008-06-11 Impact factor: 6.167
Authors: Birgit Frauscher; Fabrice Bartolomei; Katsuhiro Kobayashi; Jan Cimbalnik; Maryse A van 't Klooster; Stefan Rampp; Hiroshi Otsubo; Yvonne Höller; Joyce Y Wu; Eishi Asano; Jerome Engel; Philippe Kahane; Julia Jacobs; Jean Gotman Journal: Epilepsia Date: 2017-06-30 Impact factor: 5.864
Authors: William C Stacey; Spencer Kellis; Bradley Greger; Christopher R Butson; Paras R Patel; Trevor Assaf; Temenuzhka Mihaylova; Simon Glynn Journal: Epilepsia Date: 2013-05-03 Impact factor: 5.864