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Carnaval TG. Influence of codeine, associated or not to local anaesthetic, on sensitive, motor and propriceptive block duration of rat sciatic nerve [dissertation] São Paulo: Universidade de São Paulo, Faculdade de Odontologia; 2011. Versão Original. The improvement in sensitive blockade induced by association or previous tramadol opioid injection was proved in animals and humans suggesting potencialization or sinergism in effects. Nevertheless, there are no experiments about the influence of codeine association to local anesthetics (LA) injected simultaneously or previously to block sciatic nerve functions (sensitive, motor and proprioceptive). The propose of this experiment was evaluate the influence of codeine analgesic opioid on duration of rat sciat nerve blockade induced by lidocaine using new pharmacological protocols. It was anallyzed the nociceptive, motor and proprioceptive functions of this mist nerve comparing the effects of previous or associated injection of codeine. Eighty (N=80) Wistar male rats were functional avaliated after they received differents injected drugs solutions, in sciat nerve region: lidocaine and epinephrine (LA), local anesthetics with no vasoconstrictor (LA NV), codeine (COD), tramadol (TRAM), LA + codeine (LA + COD), LA + tramadol (LA + tramadol), codeine 20 minutes previously to LA (COD 20’+ LA) or tramadol 20 minutes previously to LA (TRAM 20’ + LA). The sensitive blockade was considered the absence of withdraw reflex after nociceptive and pressoric stimulous (analgesimether and forceps), the motor was evaluated the duration of claudication and proprioceptive by de absence of hopping and tactile response (score 0-3). We concluded that the blockade duration of (LA + COD) was greater than (COD) (p<0.01) and than (COD 20’ + LA) and than other groups (p<0.05). Codeine isolated showed discret nociceptive action. Our results suggested sinergism between opioid and LA. The associated use of codeine and LA improves de efficacy of sensitive, motor and proprioceptive blockade guiding to a new prospect in dentistry’s pain control.

Influência da codeína, associada ou não ao anestésico local, na duração do bloqueio sensitivo, motor e proprioceptivo do nervo ciático de rato