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- W2116737344 abstract "Voltage-activated sodium channels play a primary role during ischemic brain edema and thus are a pharmacological target for therapy. Lidocaine, a sodium channel blocker, was tested in male Sprague-Dawley rats anesthetized with thiobarbital (60 mg·kg(-1) i.p.) and perfused i.v. with Ringer's solution (n = 9) or lidocaine (0.75 mg·kg(-1), n = 9, or 1.5 mg·kg(-1), n = 6). Two tungsten microelectrodes were implanted in the cerebral cortex to register changes in tissue impedance in response to the voltage fall of a square wave electric pulse (100 μA, 10 ms), before and after infusion of lidocaine or Ringer's solution and during global cerebral ischemia due to a respiratory arrest induced by D-tubocurarine. Lidocaine infusion under normoxic conditions did not change voltage values (Mann-Whitney U = 51; p > 0.05). In animals infused with Ringer's solution, the voltage fall induced by global cerebral ischemia was fast for ∼8 min at -8.0 ± 2.3%·min(-1) followed by a slow decay at -0.96 ± 0.17%·min(-1). The time constant of voltage decay (λ) was 215.6 s (F = 547.4; p = 0.00000). Voltage values of lidocaine-infused animals were significantly higher than those of rats infused with Ringer's solution (U = 100; p = 0.000089). The decay rates were -4.97 ± 1.36%·min(-1) (fast phase) and -1.04 ± 0.3%·min(-1) (slow phase) with λ = 672.5 s (+211.9%; p = 0.000000). These results suggest that lidocaine significantly reduced cerebral impedance, hence exerting a strong early anti-edema effect probably by blocking voltage-activated sodium channels." @default.
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- W2116737344 date "2011-01-01" @default.
- W2116737344 modified "2023-09-25" @default.
- W2116737344 title "Time Course of Acute Neuroprotective Effects of Lidocaine Evaluated by Brain Impedanciometry in the Global Ischemia Model" @default.
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- W2116737344 doi "https://doi.org/10.1159/000334274" @default.
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