Extra-operative bipolar ECS was performed with OCS2 Ojemann cortical stimulator (Integra Life Sciences, Plainsboro, NJ). The selection of electrode pairs, stimulation end-point, and the procedure of visual naming were at the discretion of the neurologist performing the ECS. The initial settings were: pulse frequency 50 Hz, pulse duration 500 µs, train duration 5 sec, and stimulus intensity 2 mA. Stimulus intensity was increased by 1–2 mA intervals until any of the 3 endpoints were reached: functional response (aphasia, paraphasic errors, dysarthria, or oral sensorimotor phenomena); after-discharges with evolution (in frequency, amplitude, or locus); or the instrument limit of 10 mA. In case of after-discharges, sometimes the stimulus intensity was reduced by 25%, pulse duration was increased to 1 ms and repeat stimulation was attempted7 (link). For the last 6 patients, Nicolet cortical stimulator was used (Natus Medical Inc., San Carlos, CA). The procedure and initial settings were identical, except that the maximum current strength was 15 mA.
Ocs2 ojemann cortical stimulator
Manufactured by Integra LifeSciences
Sourced in United States
The OCS2 Ojemann cortical stimulator is a medical device designed for the electrical stimulation of the cerebral cortex. It provides controlled electrical stimulation to specific areas of the brain during neurosurgical procedures. The core function of the OCS2 is to assist healthcare professionals in the localization and mapping of eloquent brain regions to help guide surgical decision-making.
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Lab products found in correlation
2 protocols using ocs2 ojemann cortical stimulator
1
Extra-operative Bipolar Electrical Cortical Stimulation for Language Mapping
2
Comprehensive Neuropsychological Assessments for Tumour Resection
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Patient assessment involved pre-and postoperative neurophysiologic testing using a battery of tests for speech and cognition, including phenomic word fluency using the letters F, A, and S, semantic fluency tests (animal naming), 22 the line bisection test, 23 trail making tests A and B, 24 the Weschler Memory Scale-Logical Stories (Anna Thompson story) 25 judgement of line orientation, 26 digit span, digit symbol, Rey-Osterreith Complex Figure, 27 Barthel Index, 28 Hospital Anxiety and Depression Scale, 29 and Patient Assessment of Own Functioning. 30 All patients underwent intraoperative speech and sensorimotor testing, which was dictated by the location of the tumour and of the cortical areas exposed by the craniotomy. Speech testing included number counting, naming, and word-generation tasks. Mapping was performed using bipolar Direct Cortical Electrical Stimulation [DCES with the OCS2 Ojemann Cortical Stimulator (Integra Life Sciences; Plainsborough, NJ, USA)]. Stimulation was performed with 500-msec pulses at 60 Hz with a starting amplitude of 2 mA and peak amplitude of 8mA 31 (Figure) .
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