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Full-Band Electrocorticography of Spreading Depolarizations in Patients with Aneurysmal Subarachnoid Hemorrhage

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Part of the book series: Acta Neurochirurgica Supplement ((NEUROCHIRURGICA,volume 115))

Abstract

Cortical spreading depolarizations (CSDs) are a pathologic mechanism occurring in patients with aneurysmal subarachnoid hemorrhage and may contribute to delayed cerebral ischemia. We conducted a pilot study to determine the durations of depolarizations as measured by the negative direct current shifts in electrocorticography. Cortical electrode strips were placed in six patients (aged 35–63 years, Fisher grade 4, World Federation of Neurosurgical Societies [WFNS] 3–4) with ruptured aneurysms treated by clip ligation. Full-band electrocorticography was performed by direct current amplification (g.USBamp, Guger Tec, Graz, Austria) with ±250-mV range, 24-bit digitization, and recording/display with a customized BCI2000 platform. We recorded 191 CSDs in 4 patients, and direct current shifts of CSD (n = 403) were measured at 20 electrodes. Amplitudes were 7.2 mV (median; quartiles 6.2, 7.9), and durations were 2 min 14 s (1:53, 2:45). Ten direct current shifts in two patients with delayed infarcts were longer than 10 min, ranging up to 28 min. Taken together with previous studies, results suggest a threshold of 3–3.5 min to distinguish a normally distributed class of short CSDs with spreading hyperemia from prolonged CSDs with initial spreading ischemia. Results further demonstrate the clinical feasibility of direct current electrocorticography to monitor CSDs and assess their role in the pathology and management of subarachnoid hemorrhage.

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Acknowledgments

Supported by a grant from the Mayfield Educa­tion and Research Foundation. Dr. Dreier acknowledges support from the Deutsche Forschungsgemeinschaft (DFG DR 323/5-1) and the Bundesministerium für Bildung und Forschung (Center for Stroke Research Berlin, 01 EO 0801).

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We declare that we have no conflict of interest.

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Correspondence to Jed A. Hartings Ph.D. .

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Hartings, J.A. et al. (2013). Full-Band Electrocorticography of Spreading Depolarizations in Patients with Aneurysmal Subarachnoid Hemorrhage. In: Zuccarello, M., Clark, J., Pyne-Geithman, G., Andaluz, N., Hartings, J., Adeoye, O. (eds) Cerebral Vasospasm: Neurovascular Events After Subarachnoid Hemorrhage. Acta Neurochirurgica Supplement, vol 115. Springer, Vienna. https://doi.org/10.1007/978-3-7091-1192-5_27

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  • DOI: https://doi.org/10.1007/978-3-7091-1192-5_27

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  • Publisher Name: Springer, Vienna

  • Print ISBN: 978-3-7091-1191-8

  • Online ISBN: 978-3-7091-1192-5

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