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- W2398170899 abstract "Commonly used local anesthetics (eg, lidocaine) are nonselective in blocking sodium channel subtypes, potentially resulting in adverse events, such as prolonged muscle paralysis and unstable hemodynamics. Subtype-selective sodium channel block might avoid these unwanted adverse effects while preserving desirable anesthetic effects. The contributions of sodium channel subtypes in different components of regional anesthesia are unclear and this study assumed that selective sodium channel subtype block might produce selective nerve block.Sciatic nerve block was performed in mice with lidocaine (nonselective sodium channel blocker), tetrodotoxin (TTX, TTX-sensitive sodium channel blocker), and A-803467 (selective Nav1.8 subtype blocker). Tactile sensory, pinprick, and thermal sensory block as well as motor block were evaluated after injection of study drugs. Median effective concentration (EC50) of lidocaine, TTX, and A-803467 as well as their blocking durations were determined.Lidocaine produced regional anesthetic effects including tactile, pinprick, and thermal sensory block as well as motor block, with EC50 [mean, 95% confidence intervals (CIs)] of 4.4 (3.7-5.2), 9.4 (8.0-10.9), 5.2 (4.3-6.2), and 3.7 (3.3-4.2) mmol/L, respectively. Tetrodotoxin produced tactile sensory block and motor block with EC50 (mean, 95% CIs) of 7.7 (6.0-11.0) and 8.3 (7.4-9.8) μmol/L, respectively; whereas A-803467 produced tactile sensory block only, with EC50 (mean, 95% CIs) of 12.6 (11.7-15.6) μmol/L.Sodium channel subtype selective blockers could induce selective nerve blocks. Tetrodotoxin-sensitive sodium channel subtypes contribute to low-threshold sensory block (eg, tactile) and motor block. Unexpectedly, selective Nav1.8 subtype block induced low-threshold sensory block rather than nociceptive or motor block." @default.
- W2398170899 created "2016-06-24" @default.
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- W2398170899 date "2015-01-01" @default.
- W2398170899 modified "2023-09-28" @default.
- W2398170899 title "Characterization of Specific Roles of Sodium Channel Subtypes in Regional Anesthesia" @default.
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- W2398170899 doi "https://doi.org/10.1097/aap.0000000000000294" @default.
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