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

血管迷走神经性晕厥出现的先兆症状和体征有哪些？

There came a day when the first premonitory blast of winter swept over the city.

天，预示严冬即将来临的第一阵寒流侵袭了城市。

Since it is a rare disorder, it is difficult to say what the premonitory symptoms are.

由于这是一种罕见的病症，我们很难说清楚它的初期症状。

Purpose to observe the clinical effect of point-through-point therapy on non-premonitory migraine.

目的：观察透穴为主治疗无先兆偏头痛的临床疗效。

Objective to investigate the relationship between progestin and premonitory abortion in early stage.

目的探讨孕酮水平与早期先兆流产关系。