毒理性
北极熊(Ursus maritimus)三种药物组合的心肺效应进行了研究。1995年,五只成年北极熊接受肌肉注射,分别注射了8.2 ± 1.3 mg/kg的泰拉唑(Telazol)或159 ± 34 μg/kg的美托咪定(medetomidine)与4 ± 0.8 mg/kg的氯胺酮(ketamine)的组合,采用交叉设计。使用美托咪定-氯胺酮组合时,平均动脉压显著更高,心率更低,动脉血氧分压(Pao2)更低。1996年,六只成年北极熊接受肌肉注射,分别注射了8.2 ± 2 mg/kg的佐拉唑仑-替来他明(zolazepam-tiletamine)或74.8 ± 11.8 μg/kg的美托咪定加上2.2 ± 0.3 mg/kg的佐拉唑仑-替来他明组合,采用交叉设计。与单独使用佐拉唑仑-替来他明相比,美托咪定-佐拉唑仑-替来他明组合导致了显著更高的平均动脉压和更低的心率、碱剩余和PaO2。高血压、心动过缓和PaO2降低在使用美托咪定-氯胺酮和美托咪定-佐拉唑仑-替来他明组合时都被观察到。这两种组合对健康的熊应该是可以很好耐受的,但两者都有可能在心肺疾病的动物中产生不良反应。佐拉唑仑-替来他明产生了最小的心肺不良反应,这与这种组合在熊身上的宽安全边际一致。根据对有害刺激后心率和平均动脉压显著增加的情况来看,佐拉唑仑-替来他明的镇痛效果显然较差。
The cardiopulmonary effects of three drug combinations in polar bears (Ursus maritimus) were studied. In 1995, five adult polar bears received im injections of either 8.2 +/- 1.3 mg/kg of Telazol or a combination of 159 +/- 34 ug/kg of medetomidine with 4 +/- 0.8 mg/kg of ketamine in a crossover design. Significantly higher mean arterial pressure, lower heart rate, and lower partial pressure of arterial oxygen (Pao2) occurred with medetomidine-ketamine. In 1996, six adult polar bears were immobilized with im injections of either 8.2 +/- 2 mg/kg of zolazepam-tiletamine or a combination of 74.8 +/- 11.8 ug/kg of medetomidine plus 2.2 +/- 0.3 mg/kg of zolazepam-tiletamine in a crossover design. Significantly higher mean arterial pressure and lower heart rate, base excess, and PaO2 occurred with medetomidine-zolazepam-tiletamine compared with zolazepam-tiletamine alone. Hypertension, bradycardia, and decreased PaO2 were observed with both medetomidine-ketamine and medetomidine-zolazepam-tiletamine. Both combinations should be well tolerated by healthy bears, but both have the potential to produce adverse effects in animals with cardiopulmonary disease. Zolazepam-tiletamine produced minimal adverse cardiopulmonary effects, consistent with the wide margin of safety of this combination in bears. The analgesic effect of zolazepam-tiletamine was apparently poor on the basis of the marked increases in pulse rate and mean arterial pressure after noxious stimuli.
来源:Hazardous Substances Data Bank (HSDB)