目的:研究三种不同剂量的口服普瑞巴林对猫的最低肺泡浓度(MACISO)的影响。
方法:前瞻性,随机化,安慰剂对照,失明,交叉试验。
方法:一组8只24-48月龄的健康成年猫。
方法:在MACISO测定前2小时,将猫随机分配给三种口服剂量的普瑞巴林(低剂量:2.5mgkg-1,中剂量:5mgkg-1,高剂量:10mgkg-1)或安慰剂,以最少7天的洗脱期给予多次治疗。用异氟烷在氧气中诱导和维持麻醉,直到气管插管完成,用异氟烷维持,容量控制通气。在普瑞巴林或安慰剂给药后120分钟,使用括号技术和尾钳法一式三份确定MACISO。在MACISO测定期间记录的生理变量(包括心率和血压)被平均并在普瑞巴林和安慰剂治疗之间进行比较。采用单因素方差分析和Friedman检验对正态分布和非正态分布数据进行差异评估,分别。Tukey测试用作事后分析。p<0.05的值被认为是显著的。
结果:中、大剂量普瑞巴林治疗的MACISO分别为1.33±0.21%和1.23±0.17%,分别。安慰剂治疗后,这些指标显着低于MACISO(分别为1.62±0.13%;p=0.014,p<0.001),分别下降18±9%和24±6%。平均血浆普瑞巴林浓度与MACISO值呈负相关。治疗之间的生理变量没有显着差异。
结论:剂量为5或10mgkg-1普瑞巴林,在确定MACISO之前2小时口服给药,在猫中具有显着的异氟烷节省作用。
OBJECTIVE: To investigate the effect of three different doses of oral
pregabalin on minimum alveolar concentration of isoflurane (MACISO) in cats.
METHODS: Prospective, randomized, placebo-controlled, blinded, crossover trial.
METHODS: A group of eight healthy adult cats aged 24-48 months.
METHODS: Cats were randomly assigned to three oral doses of
pregabalin (low dose: 2.5 mg kg-1, medium dose: 5 mg kg-1, high dose: 10 mg kg-1) or placebo 2 hours before MACISO determination, with the multiple treatments administered with a minimum 7 day washout period. Anesthesia was induced and maintained with isoflurane in oxygen until endotracheal intubation was achieved, and maintained with isoflurane with volume-controlled ventilation. MACISO was determined in triplicate using the bracketing technique and tail clamp method 120 minutes after
pregabalin or placebo administration. Physiologic variables (including heart rate and blood pressure) recorded during MACISO determination were averaged and compared between the pregabalin and placebo treatments. One-way analysis of variance and the Friedman test were used to assess the difference for normally and non-normally distributed data, respectively. The Tukey test was used as a post hoc analysis. Values of p < 0.05 were considered significant.
RESULTS: The MACISO with the medium- and high-dose
pregabalin treatments were 1.33 ± 0.21% and 1.23 ± 0.17%, respectively. These were significantly lower than MACISO after placebo treatment (1.62 ± 0.13%; p = 0.014, p < 0.001, respectively), representing a decrease of 18 ± 9% and 24 ± 6%. The mean plasma
pregabalin concentration was negatively correlated with MACISO values. Physiologic variables did not differ significantly between treatments.
CONCLUSIONS: Doses of 5 or 10 mg kg-1 pregabalin, administered orally 2 hours before determining MACISO, had a significant isoflurane-sparing effect in cats.