It is generally accepted that this technique can provide direct diagnostic reference for vasovagal syncope ( vvs ) .

目前普遍认为此技术可以对血管迷走性晕厥（vvs）提供直接诊断依据。

Dr. william ravich said choking can cause a person to faint , an occurrence known as vasovagal syncope .

威廉拉维奇医生说窒息可以引起昏厥，这种情况称为血管迷走神经性昏厥。