Instead, it is typically triggered by acute emotion or physical trauma that releases a surge of adrenaline that overwhelms the heart.

相反，它通常由剧烈的情感或身体外伤引发，患者肾上腺素水平骤然升高，心脏不堪重负。

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The constant surge of adrenaline is hard on our bodies.

不断激增的肾上腺素对我们的身体来说难以应付。

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"Biologically, fight-or-flight behavior has two distinct stages, " the researchers wrote. "The short-term response [is] a surge in adrenaline production.

研究人员写道，“短期的回应[是]肾上腺激增。

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In healthy people, an adrenaline surge can trigger irregular heart rhythms and in those with heart conditions, the surge could trigger a heart attack.

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