Eighteen-hour inhibitory effect of s-ketamine on potassium- and ischemia-induced spreading depolarizations in the gyrencephalic swine brain
Spreading depolarizations (SDs) are characterized by near-complete breakdown of the transmembrane ion gradients, cytotoxic edema, and glutamate release. SDs are associated with poor neurological outcomes in cerebrovascular diseases and brain trauma. Ketamine, a N-methyl-d-aspartate receptor antagoni...
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| Main Authors: | , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
5 July 2022
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| In: |
Neuropharmacology
Year: 2022, Volume: 216, Pages: 1-14 |
| ISSN: | 1873-7064 |
| DOI: | 10.1016/j.neuropharm.2022.109176 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.neuropharm.2022.109176 Verlag, lizenzpflichtig, Volltext: https://www.sciencedirect.com/science/article/pii/S0028390822002350 
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| Author Notes: | Renán Sánchez-Porras, Modar Kentar, Roland Zerelles, Martina Geyer, Carlos Trenado, Jed A. Hartings, Johannes Woitzik, Jens P. Dreier, Edgar Santos |
MARC
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| 245 | 1 | 0 | |a Eighteen-hour inhibitory effect of s-ketamine on potassium- and ischemia-induced spreading depolarizations in the gyrencephalic swine brain |c Renán Sánchez-Porras, Modar Kentar, Roland Zerelles, Martina Geyer, Carlos Trenado, Jed A. Hartings, Johannes Woitzik, Jens P. Dreier, Edgar Santos |
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| 520 | |a Spreading depolarizations (SDs) are characterized by near-complete breakdown of the transmembrane ion gradients, cytotoxic edema, and glutamate release. SDs are associated with poor neurological outcomes in cerebrovascular diseases and brain trauma. Ketamine, a N-methyl-d-aspartate receptor antagonist, has shown to inhibit SDs in animal models and in humans. However, little is known about its SD-inhibitory effect during long-term administration. Lissencephalic animal models have shown that ketamine loses its SD-blocking effect after some minutes to hours. Physio-anatomical differences between lissencephalic and the more evolved gyrencephalic animals may affect their SDs-blocking effect. Therefore, information from the last may have more translational potential. Therefore, the aim of this study was to investigate the 18 h-effect of s-ketamine as a basis for its possible long-term clinical use for neuroprotection. For this purpose, two gyrencephalic swine brain models were used. In one, SDs were elicited through topical application of KCl; in the other model, SDs were spontaneously induced after occlusion of the middle cerebral artery. S-ketamine was administered at therapeutic human doses, 2, 4 and 5 mg/kg BW/h for up to 18 h. Our findings indicate that s-ketamine significantly reduces SD incidence and expansion without clear evidence of loss of its efficacy. Pharmacological susceptibility of SDs to s-ketamine in both the ischemic gyrencephalic brain and well-perfused brain was observed. SDs were most potently inhibited by s-ketamine doses that are above the clinically recommended (4 mg/kg BW/h and 5 mg/kg BW/h). Nonetheless, such doses are given by neurointensivists in individual cases. Our results give momentum to further investigate the feasibility of a multicenter, neuromonitoring-guided, proof-of-concept clinical trial. | ||
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| 650 | 4 | |a Gyrencephalic brain | |
| 650 | 4 | |a Ketamine | |
| 650 | 4 | |a Neuromonitoring | |
| 650 | 4 | |a Spreading depolarization | |
| 650 | 4 | |a Stroke | |
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