The squiggly outline at the lower left is the section of myocardial cells, which makes the heart beat.

左下方那片弯弯曲曲的轮廓就是心肌细胞的切面，它们使心脏跳动。

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It was like an invisible claw which had grabbed my heart tightly, making it unable to beat.

就像一只无形的利爪，紧紧抓住我的心，让它无法跳动。

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My own heart, which was pounding at twice the rhythm of his, skipped a beat.

我自己的心脏，能有他心跳节奏的两倍。

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An LV lead (a thin, coated wire) is placed on the lower left chamber of the heart (the left ventricle) to stimulate the two sides of the heart to beat in synchronization with each other, which helps the heart to beat more efficiently.

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Treatments such as diuretics (which speed up the elimination of water and salt), beta-blockers (which cause the heart to beat more slowly and less forcefully) and ACE inhibitors (which stop the production of water-attracting chemicals) have long been available.

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There are lots of different treatments you can have to fix the problem of an irregular heart beat, which is called tachycardia.

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