If orthopnea causes awakening during the night and is relieved by sitting, it is called paroxysmal nocturnal dyspnea.

如果端坐呼吸引起夜间觉醒，经坐起缓解，是为阵发性夜间呼吸困难。

Abstract Objective: To study the effect of T-lymphocytes on hematopoietic progenitors in patients with paroxysmal nocturnal hemoglobinuria(PNH).

研究阵发性睡眠性血红蛋白尿症(PNH)患者的T淋巴细胞对造血祖细胞的影响。

Vestibular Neuronitis, also called Vestibular neuritis, is a paroxysmal, single attack of vertigo. It may last several hours to days.

什么是'前庭神经炎-颅神经炎症引起的眩晕攻击'?