Intramuscular Alfaxalone Effective Dose (ED) Determination and Cardiopulmonary Effects of ED99 in Sonoran Desert Toads (Incilius alvarius)

Katya Spitznagel, Miranda J. Sadar, Erin Willis, J. Brandão
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Abstract

There is limited knowledge on amphibian sedation, and drug doses appear to be species-specific and affected by the administration route. Alfaxalone, a neuroactive steroid, has gained popularity in veterinary medicine and has been evaluated in some amphibian species. Previous studies in amphibians have demonstrated a sedative dose range of 10-30 mg/kg IM. No peer-review publication has investigated this drug in Sonoran Desert toads specifically. Therefore, the purpose of this study was to 1) determine the effective dose 50 (ED50) of IM alfaxalone for sedation and 2) determine the cardiopulmonary effects of the effective dose 99 (ED99) in 13 Sonoran Desert toads. Using the Dixon’s Up-and-Down method, the ED50 was calculated as 9.02 mg/kg while using a non-linear regression, the calculated ED50 was 9.65 mg/kg, and the ED99 was 9.91 mg/kg. Based on these results, 10 mg/kg IM was administered, and its cardiovascular effects were determined for 120 mins post-injection. The 10 mg/kg IM dose resulted in significant transient cardiorespiratory depression in all toads, with most toads (11/13) showing signs of sedation (recumbency and/or loss of righting reflex) within 30–40-minutes post-injection. There was no associated mortality with this study, and the side effects associated with this dosage (cardiorespiratory depression, ventral erythema, dysphoric behavior such as rolling and head pressing) resolved in all toads prior to the end of the 120-minute observation window. This study hopes to increase the understanding of the clinical application and limitations of this drug for sedation of Sonoran Desert toads.
阿法索龙肌注有效剂量(ED)测定及ED99对索诺兰沙漠蟾蜍的心肺作用
关于两栖动物镇静的知识有限,药物剂量似乎是物种特异性的,并受给药途径的影响。阿法克龙是一种神经活性类固醇,在兽医学中得到了广泛应用,并在一些两栖动物中进行了评估。先前对两栖动物的研究表明,镇静剂量范围为10-30 mg/kg IM。没有同行评议的出版物专门研究过索诺兰沙漠蟾蜍的这种药物。因此,本研究的目的是:1)测定IM - alfaxone镇静作用的有效剂量50 (ED50), 2)测定有效剂量99 (ED99)对13只索诺兰沙漠蟾蜍的心肺作用。采用Dixon上下法计算ED50为9.02 mg/kg,采用非线性回归法计算ED50为9.65 mg/kg, ED99为9.91 mg/kg。在此基础上,给予10 mg/kg IM,并在注射后120 min测定其心血管作用。10mg /kg的IM剂量在所有蟾蜍中导致显著的短暂性心肺抑制,大多数蟾蜍(11/13)在注射后30 - 40分钟内表现出镇静迹象(平躺和/或转直反射丧失)。在120分钟的观察窗口结束前,所有蟾蜍的相关副作用(心肺功能抑制、腹侧红斑、烦躁行为(如滚动和压头)均已消除。本研究希望增加对该药在索诺兰沙漠蟾蜍镇静中的临床应用及局限性的认识。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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