If present, these signs include pallor, weakness, lightheadedness, yawning, nausea, diaphoresis, hyperventilation, blurred vision, and impaired hearing immediately before the syncopal event.
If present, these signs include pallor, weakness, lightheadedness, yawning, nausea, diaphoresis, hyperventilation, blurred vision, and impaired hearing immediately before the syncopal event.
晕厥发生前，可立即出现面色苍白、虚弱无力、头晕、打哈欠、恶心、出汗、过度通气、视力模糊和听力下降。