Articles: nerve-block.
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Oral Surg. Oral Med. Oral Pathol. · Jul 1985
Case ReportsPeripheral facial nerve paralysis after local dental anesthesia.
An unusual case of unilateral peripheral facial nerve paralysis following local dental anesthesia is reported. The onset of the paralysis was 13 days after the injection, whereas the longest period reported previously was 5 days. The etiology, management, and prognosis are discussed.
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An inexpensive, portable nerve stimulator is described which is easily constructed and may be used to enhance the ease and effectiveness of peripheral nerve blockade.
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The in vitro sensitivities to local anaesthetic blockade of A, B and C nerve fibres in rabbit vagus nerves were examined using a series of structurally similar amino-ester agents which varied in lipid solubility and anaesthetic potency. A fibres were found to be the most sensitive and C fibres the least sensitive to conduction blockade with all the agents, provided that equilibrium blockade was allowed to develop. A correlation existed between the intrinsic anaesthetic potency of the various agents and their lipid solubilities. ⋯ As lipid solubility decreased through the series studied, so the onset of conduction blockade of A fibres was prolonged. It is suggested that this related to decreasing ability to penetrate the lipid diffusion barriers around A fibres. The traditional view that C fibres were more sensitive to block may have arisen because of confusion between absolute sensitivity and rate of development of conduction blockade.