Anesthesia and analgesia
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Anesthesia and analgesia · Jan 1980
Comparative StudyWithdrawal convulsions in mice following nitrous oxide.
Mice may be induced to convulse after (but not prior to) breathing nitrous oxide. We found that the incidence of this withdrawal phenomenon is related to the partial pressure of nitrous oxide. A minimum (threshold) value of about 0.5 atm is necessary and the majority of mice convulse following exposure to 0.9 atm or greater. ⋯ The mice remain susceptible to the induction of convulsions for only a brief period after removal from nitrous oxide. Although the duration of susceptibility is slightly increased after exposure to higher partial pressures, susceptibility in almost all cases is lost by 90 minutes. In mice, exposure to nitrous oxide is associated with evidence of physical dependence as evidenced by withdrawal symptoms, symptoms that be related to the appearance of excitement which sometimes follows nitrous oxide anesthesia.
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Anesthesia and analgesia · Nov 1979
Antagonism of pancuronium and its metabolites by neostigmine in cats.
Antagonism by neostigmine of neuromuscular blockade produced by pancuronium or its metabolites was studied in the cat anterior or tibialis muscle-peroneal nerve preparation using constant infusions of muscle relaxants. The ED50 of neostigmine (dose which caused a 50% antagonism) was 16, 11, 29, and 26 micrograms/kg for pancuronium, 3-hydroxypancuronium, 17-hydroxypancuronium, and 3, 17-hydroxypancuronium, respectively. ⋯ We conclude that more neostigmine is required to antagonize 17- or 3,17-hydroxypancuronium neuromuscular blockade than is required to antagonize pancuronium. Conversely, less neostigmine was required to antagonize 3-hydroxypancuronium blockade.
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Anesthesia and analgesia · Nov 1979
Letter Case ReportsMore on intravascular migration of an epidural catheter.