Methods This is a randomized, double blind, double-dummy, multi-center, parallel positive controlled clinical study.

方法用随机化、双盲、双模拟、多中心、阳性药平行对照研究方法。

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Packer says this is the first placebo-controlled study in acute heart failure to show a clinical benefit.

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For one, the groups noted the analysis is a retrospective study, not a prospective, randomized controlled clinical trial, which many regard as a gold standard for ferreting out safety concerns.

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