这个词是什么意思？
A transient loss of consciousness and postural tone caused by diminished blood flow to the brain (i.e., BRAIN ISCHEMIA). Presyncope refers to the sensation of lightheadedness and loss of strength that precedes a syncopal event or accompanies an incomplete syncope. (From Adams et al., Principles of Neurology, 6th ed, pp367-9)
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D013575 · MeSH 2026。
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