静脉嗅觉检查法是通过静脉注射新维生素B_1,经静脉到肺,呼出含有嗅素的气体,从后鼻孔到达嗅裂,产生嗅觉。本法操作简单,无需特殊装置,能较容易地检知有无嗅觉丧失。具体做法是:新维生素 B_1注射液10mg(2ml),在10秒中匀速注入右肘正中静脉,被检者平静呼吸,即可感知新维生素 B~1的臭味。从静脉注射开始,到出现新维生素 B_1臭味,称为潜伏期,正常约为8～9秒。此后到新维生素 B_1臭味消失,称为持续时间,正常约为1～2分。嗅觉障碍者,潜伏期延长,持续时间缩短,嗅觉完全丧失者,不能感知新维生素 B_1臭味。早在1916年就有人提出血行性嗅觉,其后又有人将嗅觉分为血行性及鼻性两种。后来又 Vein olfactory examination is the intravenous injection of new vitamin B_1, the vein to the lungs, exhaled gas containing olfactory, from the posterior nostril reach the olfactory cleft, the sense of smell. This method is simple, without special equipment, can detect whether the loss of smell more easily. The specific approach is: new vitamin B_1 injection 10mg (2ml), 10 seconds into the right middle elbow vein at a constant rate, the subjects were calm breathing, you can perceive the smell of new vitamin B ~ 1. From the beginning of intravenous injection to the emergence of new vitamin B 1 odor, known as the incubation period, the normal is about 8 to 9 seconds. Since then the smell of new vitamin B 1 disappeared, called the duration of normal about 1 to 2 minutes. Olfactory disabilities, the incubation period is prolonged, the duration is shortened, the total loss of smell, can not feel the smell of new vitamin B_1. As early as 1916, some people proposed the hematic smelling, and then someone divided the sense of smell into two kinds: hematogenous and nasal. Later again