左心衰竭肺淤血时，有些巨噬细胞吞噬了红细胞并将其分解，胞浆内形成含铁血黄素，此时这种细胞称为心力衰竭细胞。又称心衰细胞。 如慢性肺淤血时，肺泡腔中可见肺泡巨噬细胞吞噬红细胞形成的心衰细胞。但并不是所有肺淤血都能见心衰细胞，只有左心衰引起的肺淤血才能见到。
他们使用更为特殊的干细胞(仅分化为心脏细胞的干细胞)来修复心衰病人的心脏。
They have used more specialised stem cells-ones that spin off only cardiac cells-to repair the hearts of people with heart failure.
虽然有许多实验显示干细胞治疗心衰具有潜在的治疗作用，但是给药途径尚处研究之中。
Although many studies have shown the potential beneficial effects of stem cell therapies in treatment for heart failure, delivery methods are still under investigation.
实验提供了最好的证据：有活力但有争议的干细胞可能会修复心脏病发作，心衰。
The experiment provides the best evidence yet that the powerful but controversial stem cells might be used to repair the ravages of heart attacks and heart failure, the researchers said.
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