Sixten Bergman

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The benzodiazepines are among the most widely used drugs in the world. When first introduced, little was known about their mechanism of action. However, in the last 20 years, our understanding of the chemistry and function of the central nervous system (CNS) has increased substantially. This knowledge has shed some light on the mechanism of action of the(More)
A rabbit tooth pulp antinociceptive model was used to investigate the effect of prior administration of diazepam or muscimol on the potency and duration of fentanyl and meperidine Potency experiments compared ED(50) values in all-or-none dose-response assays between both muscimol (0.25 mg/kg) and saline, and diazepam (1.5 mg/kg) and propylene glycol(More)
Low dose naloxone was reported to produce analgesia of long duration in patients who received buprenorphine. A rabbit tooth pulp antinociceptive model was utilized to evaluate a possible interaction of buprenorphine and naloxone. Naloxone (0.001 mg/kg i.v.) 210 min after buprenorphine (0.10 mg/kg i.v.) significantly increased the % MPE from 48 +/- 5% to 78(More)
Clinical antinociception is difficult to assess because of difficulties with controls and the incorporation of bias. The rabbit antinociceptive model is highly sensitive and predictive of analgesia in humans. We found that the combination of midazolam with fentanyl enhanced antinociception compared with fentanyl alone. In addition, with this model there(More)
This study investigated the effects of pretreatment with muscimol (GABA-agonist) or diazepam (indirect GABAmimetic) on i.v. meperidine, fentanyl, alphaprodine and morphine, using rabbit tooth pulp and mouse hot plate assays. A previous study reported that the ED50 values for fentanyl in rabbits were significantly lowered by 0.25 mg/kg of muscimol (13.8 to(More)
During 0.2 to 1.0 Hz stimulation of an epileptogenic focus, the phenomenon of cyclic spike driving (CSD) occurs, wherein 20- to 40-sec active periods, in which each stimulus triggers an all-or-none interictal event (IE), alternate with quiet periods of similar duration, in which IE are not triggered. CSD was simulated by a model in which individual IE are(More)
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