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J Am Heart Assoc:SPRINT和ACCORD干预相似为何试验结果不一致?

2018-01-19 何娜 环球医学

美国科学家在《J Am Heart Assoc》发表文章,探究了SPRINT(收缩压干预试验)和ACCORD(控制糖尿病患者心血管风险的策略)干预相似但试验结果不一致的可能解释。

美国科学家在《J Am Heart Assoc》发表文章,探究了SPRINT(收缩压干预试验)和ACCORD(控制糖尿病患者心血管风险的策略)干预相似但试验结果不一致的可能解释。

背景:SPRINT和ACCORD血压试验使用了相似的干预,但得出不一致的结果。研究者考察了是否由SBP应答的差异造成了不一致的试验结果。

方法和结果:研究者使用生长混合模型,评价了SPRINT和ACCORD强化和标准治疗组第1年SBP应答分布情况。研究者评价1年时达到的SBP分布方面是否存在试验间的显着差异,以及独立于治疗的达到的SBP与每项试验中定义的主要结局风险——心衰卒中和全因死亡之间的相关性。研究者考察了不同随访时间血压变异性是否与异质的治疗效果相关。在SPRINT中9027例和ACCORD中4575例参与者中,治疗组之间达到的平均SBP差异为SPRINT 15.7 mm Hg和ACCORD14.2 mm Hg,但SPRINT达到的SBP的组间重叠显着较少(强化和标准组的标准差分别为:SPRINT 6.7和5.9 mm Hg vs ACCORD 8.8和8.2 mm Hg;P<0.001)。除了卒中和全因死亡,试验之间达到的SBP与结局之间的相关性一致。SPRINT中较高的随访血压变异性较为常见,但无治疗影响异质性。

结论:SPRINT和ACCORD治疗组之间达到SBP的分离程度不同,甚至它们的平均差异相似。达到的SBP的组间重叠较大或可解释不一致的试验结果。

专家点评:这一研究为两个血压相关的RCT不一致的结果提供了可能的解释,其实也为解释其他类似的结果差异提供了思路,即虽然均值差异相似,但标准差的大小可能会影响效应量,标准差过大(组间重叠较大)可能会弱化效果差异

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    2018-08-02 kalseyzl
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    2018-01-21 zhaojie88
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    2018-01-21 slcumt

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