这个词是什么意思？
Cardiac arrhythmias that are characterized by excessively slow HEART RATE, usually below 50 beats per minute in human adults. They can be classified broadly into SINOATRIAL NODE dysfunction and ATRIOVENTRICULAR BLOCK.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D001919 · MeSH 2026。
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