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- W1486818238 abstract "Background and purpose: Results from several studies point to voltage‐gated Na + channels as potential mediators of the immobility produced by inhaled anaesthetics. We hypothesized that the intrathecal administration of tetrodotoxin, a drug that blocks Na + channels, should enhance anaesthetic potency, and that concurrent administration of veratridine, a drug that augments Na + channel opening, should reverse the increase in potency. Experimental approach: We measured the change in isoflurane potency for reducing movement in response to a painful stimulus as defined by MAC (minimum alveolar concentration of anaesthetic required to abolish movement in 50% of subjects) caused by intrathecal infusion of various concentrations of tetrodotoxin into the lumbothoracic subarachnoid space of rats, and the change in MAC caused by the administration of a fixed dose of tetrodotoxin plus various doses of intrathecal veratridine. Key results: Intrathecal infusion of tetrodotoxin (0.078–0.63 µM) produced a reversible dose‐related decrease in MAC, of more than 50% at the highest concentration. Intrathecal co‐administration of veratridine (1.6–6.4 µM) reversed this decrease in a dose‐related manner, with nearly complete reversal at the highest veratridine dose tested. Conclusions and implications: Intrathecal administration of tetrodotoxin increases isoflurane potency (decreases isoflurane MAC), and intrathecal administration of veratridine counteracts this effect in vivo . These findings are consistent with a role for voltage‐gated Na + channel blockade in the immobility produced by inhaled anaesthetics." @default.
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- W1486818238 date "2010-02-01" @default.
- W1486818238 modified "2023-10-06" @default.
- W1486818238 title "Bidirectional modulation of isoflurane potency by intrathecal tetrodotoxin and veratridine in rats" @default.
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- W1486818238 doi "https://doi.org/10.1111/j.1476-5381.2009.00583.x" @default.
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