OBJECTIVE: To study when afterdischarges (ADs) are more likely to occur during cortical stimulation. METHODS: We examined 6250 electrical stimulation trials in 13 patients with subdural electrodes, studying whether AD occurrence during a trial was influenced by electrode pair stimulated or AD occurrence during the previous trial. In total 545 electrodes were stimulated, 119 frontal (pre-perirolandic), 289 perirolandic, 36 parietal (post-perirolandic), 95 temporal, and 6 occipital. RESULTS: When the same electrode pair was stimulated as the prior trial, 19% produced ADs compared to 5% of trials when a different electrodes pair was stimulated (p<0.0001). When trials showed ADs, and the next trial stimulated the same electrode pair, ADs occurred in 46% of cases, compared to 13% of trials following trials without ADs (p<0.0001). AD probability decreased with increased inter-trial interval length only when the prior trial was at the same electrode pair and had produced an AD (p=0.001). AD probability increased with stimulation duration, whether the trial followed a trial with (p<0.001) or without (p<0.0001) an AD. CONCLUSIONS: ADs were more likely to occur when an electrode pair showed ADs and was stimulated again, especially when stimulating after short inter-trial intervals or for longer duration. SIGNIFICANCE: When ADs occur, waiting about a minute before resuming stimulation might lessen the likelihood of AD recurrence. Copyright 2009 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved.
OBJECTIVE: To study when afterdischarges (ADs) are more likely to occur during cortical stimulation. METHODS: We examined 6250 electrical stimulation trials in 13 patients with subdural electrodes, studying whether AD occurrence during a trial was influenced by electrode pair stimulated or AD occurrence during the previous trial. In total 545 electrodes were stimulated, 119 frontal (pre-perirolandic), 289 perirolandic, 36 parietal (post-perirolandic), 95 temporal, and 6 occipital. RESULTS: When the same electrode pair was stimulated as the prior trial, 19% produced ADs compared to 5% of trials when a different electrodes pair was stimulated (p<0.0001). When trials showed ADs, and the next trial stimulated the same electrode pair, ADs occurred in 46% of cases, compared to 13% of trials following trials without ADs (p<0.0001). AD probability decreased with increased inter-trial interval length only when the prior trial was at the same electrode pair and had produced an AD (p=0.001). AD probability increased with stimulation duration, whether the trial followed a trial with (p<0.001) or without (p<0.0001) an AD. CONCLUSIONS:ADs were more likely to occur when an electrode pair showed ADs and was stimulated again, especially when stimulating after short inter-trial intervals or for longer duration. SIGNIFICANCE: When ADs occur, waiting about a minute before resuming stimulation might lessen the likelihood of AD recurrence. Copyright 2009 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved.
Authors: Imran H Quraishi; Christopher F Benjamin; Dennis D Spencer; Hal Blumenfeld; Rafeed Alkawadri Journal: Epilepsy Behav Case Rep Date: 2017-09-29
Authors: Sarah F Muldoon; Julia Costantini; W R S Webber; Ronald Lesser; Danielle S Bassett Journal: Neuroimage Clin Date: 2018-02-27 Impact factor: 4.881