fatal syncope

例句：

1. 1.He collapsed from a sudden heart attack and died instantly.
   他因突发心脏病突然倒下并立即死亡。
2. 2. The doctor warned the patient to avoid high altitudes as it could cause fatal syncope.
   医生警告病人避免高海拔，因为那里可能会导致致命性晕厥。
3. 3.Fatal syncope is a medical emergency that requires immediate medical attention.
   致命性晕厥是一种需要立即医疗关注的医疗紧急情况。