广播电视英语短句 第 299 课：关于中风-3

But recent findings have suggested that tPA may be effective in saving brain tissue even if three to four and a half hours have passed. 但是，最近的研究结果表明即使 3-4 个半小时过去了， tPA 仍可能拯救脑组织，。

Some studies have failed to produce clear evidence to support treatment after three hours. 一些研究并不能明确地支持 3 个小时后的治疗效果。

But scientists reported that the evidence was stronger when they combined the results of the four major studies done so far. 但科学家们报告说，当他们结合迄今所做的 4 个主要研究的结果，证据是强有力的。

The new findings appeared in the journal Stroke. 新的研究结果刊登在《中风》杂志上。

The researchers said tPA improved the chances of a successful result by thirty-one percent and produced no change in the death rate. 研究人员说， tPA 可以提高 31% 的好的预后率，但是不产生死亡率的改变。