例1，患者，女，60岁，因“头晕，呕吐半小时”入院。患者于吃饭时突然出现头晕，头痛，以头晕为主，并伴有恶心，呕吐，不能站立，以往有类似发作史。体检：神清，烦躁，能对答，检查不十分合作，血压12／8kPa，两侧额纹，＊唇沟时称，眼球震颤阳性，指鼻试验，轮替试验（因患 Example 1, patient, female, 60 years old, due to “dizziness, vomiting half an hour” admission. Patients suddenly dizzy when eating, headache, mainly dizziness, accompanied by nausea, vomiting, can not stand, in the past a history of similar attacks. Physical examination: Shen Qing, irritability, can answer, the examination is not very cooperative, blood pressure 12 / 8kPa, both frontal pattern, * lip groove when said nystagmus positive, nasal test, rotation test