血管迷走神经性晕厥出现的先兆症状和体征有哪些？

What premonitory signs and symptoms may exist for vasovagal syncope? 1.

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因为血管迷走神经性晕厥的特殊生理机制尚未明了，因此，很难鉴别可能存在血管迷走神经性晕厥的患者。

As specific physiologic triggers have not been clearly identified, it is difficult to identify those patients who may be at risk for vasovagal syncope.

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