这个词是什么意思？
A condition of fainting spells caused by heart block, often an atrioventricular block, that leads to BRADYCARDIA and drop in CARDIAC OUTPUT. When the cardiac output becomes too low, the patient faints (SYNCOPE). In some cases, the syncope attacks are transient and in others cases repetitive and persistent.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D000219 · MeSH 2026。
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