Most pacemakers have a sensing device that turns itself off when the heartbeat is above a certain level. It turns back on when the heartbeat is too slow.
大部分起搏器有感受装置，当心率超过一定水平时自动关闭，当心率过慢时打开，这叫做按需式起搏器。
Most pacemakers have a sensing device that turns itself off when the heartbeat is above a certain level. It turns back on when the heartbeat is too slow.
大部分起搏器有感受装置，当心率超过一定水平时自动关闭，当心率过慢时打开，这叫做按需式起搏器。
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