Respir Res:乙酰甲胆碱剂量效应曲线能否评估哮喘药物的支气管保护作用?

2017-08-28 吴星 环球医学

2017年8月,发表在《Respir Res》的一项由加拿大科学家进行的随机、双盲、双模拟、三向交叉研究,考察了格隆溴铵和茚达特罗单一治疗和联合用药对轻度哮喘患者乙酰甲胆碱剂量效应曲线的影响,以及乙酰甲胆碱剂量效应曲线能否评估支气管保护作用。



2017年8月,发表在《Respir Res》的一项由加拿大科学家进行的随机、双盲、双模拟、三向交叉研究,考察了格隆溴铵和茚达特罗单一治疗和联合用药对轻度哮喘患者乙酰甲胆碱剂量效应曲线的影响,以及乙酰甲胆碱剂量效应曲线能否评估支气管保护作用。

背景:乙酰甲胆碱剂量效应曲线说明对乙酰甲胆碱诱导的气道高反应性具有药物支气管保护作用,能用于测定气道敏感性的变化(位置)、反应性(斜率)和给药后最大应答。本研究旨在确定单剂量格隆溴铵(长效毒蕈碱受体拮抗剂)和茚达特罗(超长效β2受体激动剂),作为单一治疗和联合用药对轻度哮喘患者乙酰甲胆碱剂量效应曲线的影响,并将这些结果与非哮喘对照曲线进行比较。

方法:这是一项随机、双盲、双模拟、三向交叉研究。对于哮喘患者(14例),每个治疗组都包括基线乙酰甲胆碱激发、药物给药、及在1、24和48小时的重复乙酰甲胆碱激发。非哮喘对照(15例)进行了单乙酰甲胆碱激发,并不接受任何研究治疗。乙酰甲胆碱的剂量效应曲线通过每个乙酰甲胆碱浓度给药后1秒用力呼气量(FEV1)下降的百分比绘制,然后生成最佳拟合曲线。通过线性回归计算气道反应性的差异。造成FEV1下降20%的乙酰甲胆碱激发浓度的变化用于评估气道敏感性的改变。

结果:与基线相比,所有治疗都显着降低给药后1小时对乙酰甲胆碱的气道敏感性(茚达特罗约1.5倍倍增浓度;格隆溴铵约5倍倍增浓度;联合用药约5倍倍增浓度)。仅有格隆溴铵和联合用药在24小时和48小时后的支气管保护作用仍然显着。气道反应性未受到茚达特罗的影响,而格隆溴铵可显着降低所有时间点的气道反应性(P=0.003~0.027)。联合用药仅可显着降低1小时(P=0.021)和24小时(P=0.039)的斜率。非哮喘对照和1小时格隆溴铵曲线几乎是一样的。仅有非哮喘对照和联合用药治疗后1小时曲线会产生真实的应答平台(3个数据点在5%内),这在FEV1下降14%时发生。

结论:乙酰甲胆碱的剂量效应曲线可区别不同哮喘药物种类激发的支气管保护作用机制。当进行优越性、等价性或非劣效性试验时,使用乙酰甲胆碱剂量效应曲线评估支气管保护作用在呼吸治疗药物的临床研发期间是有用的。

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    2017-11-15 huangdf
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    2017-08-30 grace5704
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    2017-08-29 184****9840

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