双语字幕
Normal vs. Slow heart rate
正常心率 vs. 心率缓慢
Slow cardiac rhythm disturbances or bradycardia.
心脏节律缓慢或心动过缓
The heart is the engine of the body. It pumps blood through the circulatory system supplying the cells with oxygen and nutrients.
心脏是身体的“发动机”。它通过循环系统泵送血液，为细胞提供氧气和营养。
The pumping motions are controlled by electrical stimuli distributed in the heart by a conduction system. The cardiac conduction system consists of the SA node, the AV node, and the left and right bundle branches.
泵送运动由传导系统在心脏中分布的电刺激控制。心脏传导系统由 SA 结、AV结和左右束支组成。
The electrical stimuli are generated in the SA node, the natural pacemaker of the heart. The SA node determines how often the heart beats per minute. At rest, a healthy heart beats about 60 to 80 times per minute.
电刺激在 SA 结（心脏的天然起搏器）中产生。SA 结决定每分钟心跳的频率。休息时，健康的心脏跳动 60-80 次/分钟。
If the heartbeat drops to consistently less than 60 beats per minute, this is referred to as bradycardia. The slowed heart rate does not permit enough oxygen to circulate through the body, which can result in dizziness and fainting.
如果心跳持续低于 60 次/分钟，则称为心动过缓。心率过缓使全身循环中的氧气不足，从而导致头晕和晕厥。
相关单词学习
Bradycardia
①发音和释义
brad•y•car•di•a/ˌbrædɪˈkɑːdɪə/n. 心动过缓
A slow heartbeat rate, usually less than 60 beats per minute.
单词 bradycardia 由下列成分构成
brady-（前缀）缓慢；徐缓
+
-cardia 心脏
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应用动画讲解心脏病发作、心肌病、遗传性心脏病、心力衰竭、房颤、卒中等心脏疾病或心脏相关疾病的诊治，每节课附有病例报告，字幕标准。
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